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{{Short description|North Indian Ocean tropical cyclone season}}
{{Infobox hurricane season
| Basin=NIO
| Year=2012
| Track=2012 North Indian Ocean cyclone season summary.png
| First storm formed=October 10, 2012
| Last storm dissipated=December 24, 2012
| Total disturbances=5
| Total depressions=5
| Total storms=2
| Total hurricanes=
| Total intense=
| Total super=
| Strongest storm name=[[Cyclone Nilam|Nilam]]
| Strongest storm pressure=987
| Strongest storm winds=45
| Average wind speed=3
| Fatalities=128 total
| Damages=56.7
| Damagespre=
| five seasons=[[2010 North Indian Ocean cyclone season|2010]], [[2011 North Indian Ocean cyclone season|2011]], '''2012''', [[2013 North Indian Ocean cyclone season|2013]], [[2014 North Indian Ocean cyclone season|2014]]
| Season timeline=Timeline of the 2012 North Indian Ocean cyclone season
|Atlantic season=2012 Atlantic hurricane season
|East Pacific season=2012 Pacific hurricane season
|West Pacific season=2012 Pacific typhoon season
}}
The '''2012 North Indian Ocean cyclone season''' was an event in the annual cycle of [[tropical cyclone]] formation. The season had a late start, with the first system forming in October. During the season, only five systems formed, of which only two became cyclonic storms. Both the storms made landfall, and they, along with the deep depressions, were responsible for 128 deaths and economic losses worth at least $56.7 million (2012 USD).

The scope of this article is limited to the Indian Ocean in the [[Northern Hemisphere]], east of the [[Horn of Africa]] and west of the [[Malay Peninsula]]. There are two main seas in the North Indian Ocean — the [[Arabian Sea]] to the west of the [[Indian subcontinent]], abbreviated ''ARB'' by the [[India Meteorological Department]] (IMD); and the [[Bay of Bengal]] to the east, abbreviated ''BOB'' by the IMD. The official [[Regional Specialized Meteorological Centre]] in this basin is the [[India Meteorological Department]] (IMD), while the [[Joint Typhoon Warning Center]] releases unofficial advisories.<ref name="IMD">{{cite web|title=IMD Cyclone Warning Services: Tropical Cyclones |url=http://www.imd.ernet.in/services/cyclone/tropical-cyclone.htm |url-status=dead |archiveurl=https://web.archive.org/web/20090529004113/http://www.imd.ernet.in/services/cyclone/tropical-cyclone.htm |archivedate=2009-05-29 }}</ref>

__TOC__
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==Season summary==
{{see also|Timeline of the 2012 North Indian Ocean cyclone season}}
<center>
<timeline>
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id:canvas value:gray(0.88)
id:GP value:red
id:TD value:rgb(0.5,0.8,1) legend:Depression
id:DD value:rgb(0.37,0.73,1) legend:Deep_Depression
id:TS value:rgb(0,0.98,0.96) legend:Cyclonic_Storm
id:ST value:rgb(0.8,1,1) legend:Severe_Cyclonic_Storm
id:VS value:rgb(1,1,0.8) legend:Very_Severe_Cyclonic_Storm
id:ES value:rgb(1,0.76,0.25) legend:Extremely_Severe_Cyclonic_Storm
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barset:Hurricane width:10 align:left fontsize:S shift:(4,-4) anchor:till
from:10/10/2012 till:11/10/2012 color:DD text:BOB 01 (DD)
from:22/10/2012 till:26/10/2012 color:TS text:Murjan (CS)
from:28/10/2012 till:01/11/2012 color:TS text:[[Cyclone Nilam|Nilam (CS)]]
from:17/11/2012 till:19/11/2012 color:DD text:BOB 03 (DD)
from:22/12/2012 till:24/12/2012 color:DD text:ARB 02 (DD)
bar:Month width:5 align:center fontsize:S shift:(0,-20) anchor:middle color:canvas
from:01/10/2012 till:01/11/2012 text:October
from:01/11/2012 till:01/12/2012 text:November
from:01/12/2012 till:01/01/2013 text:December
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</center>
The first depression of the season developed out of the remnants of [[2012 Pacific typhoon season#Severe Tropical Storm Gaemi (Marce)|Severe Tropical Storm Gaemi]] on October 10, 2012, very late into the 2012 cyclone season, about {{convert|350|km|mi|round=5|abbr=on}} southeast of [[Kolkata]], [[West Bengal]]. and brought high winds and heavy rains to much of [[Bangladesh]], causing extensive damage. The storm killed a total of 30 people. On October 23, the second depression of the season developed out of a persistent low in the [[Arabian Sea]] and soon became the first cyclonic storm of the season ''Murjan''. Only two days later, the third depression of the season formed in southern Bay of Bengal and gradually strengthened into Cyclonic Storm Nilam. The cyclone made landfall over Southern India early on October 31 and dissipated on November 2.
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==Systems==

===Deep Depression BOB 01===
{{Infobox tropical cyclone small
|Basin=NIO
|Image=BOB 01 Oct 10 2012 0440Z.jpg
|Track=BOB01 2012 track.png
|Formed=October 10
|Dissipated=October 11
|3-min winds=30
|Pressure=1002
}}
On October 10, the IMD started to monitor a depression that had developed out of an area of convection, associated with the remnants of [[2012 Pacific typhoon season#Severe Tropical Storm Gaemi (Marce)|Severe Tropical Storm Gaemi]] about {{convert|350|km|mi|round=5|abbr=on}} southeast of [[Kolkata]], [[West Bengal]].<ref>{{cite web |title=Hurricane Season: 97L, 98L, 94B and Prapiroon |publisher=The Weather Channel |author=Stu Ostro |url=http://www.weather.com/newscenter/tropical/ |archiveurl=https://www.webcitation.org/6BKsCFMZG?url=http://www.weather.com/newscenter/tropical/ |archivedate=2012-10-11 |date=October 11, 2012 |url-status=dead |access-date=2012-10-24 }}</ref><ref>{{cite web|title=Special Tropical Weather Outlook for the North Indian Ocean October 10, 2012 16z |author=Regional Specialised Meteorological Center New Delhi, India |accessdate=October 11, 2012 |archiveurl=https://www.webcitation.org/6BKlIHXE9?url=http://gwydir.demon.co.uk/advisories/WTIN20-DEMS_201210101748.htm |archivedate=October 11, 2012 |date=October 10, 2012 |publisher=India Meteorological Department |url=http://www.imd.gov.in/section/nhac/dynamic/rsmc.pdf |url-status=dead }}</ref> During that day the depression moved towards the north and crossed the [[Bangladesh]] coast near [[Hatiya, Bangladesh|Hatiya]] early the next day.<ref>{{cite web|title=Special Tropical Weather Outlook for the North Indian Ocean October 11, 2012 06z |author=Regional Specialised Meteorological Center New Delhi, India |accessdate=October 11, 2012 |archiveurl=https://www.webcitation.org/6BKnTLVS7?url=http://gwydir.demon.co.uk/advisories/WTIN20-DEMS_201210110600.htm |date=October 11, 2012 |publisher=India Meteorological Department |archivedate=October 11, 2012 |url=http://www.imd.gov.in/section/nhac/dynamic/rsmc.pdf |url-status=dead }}</ref> After the depression had made landfall, the IMD issued their final advisory on the depression as the system had weakened into an area of low pressure.<ref name=bob01final>{{cite web|title=Cyclone Warning For Indian Coast, Depression BOB 01, Warning 4 |archiveurl=https://www.webcitation.org/6BKdR3rt0?url=http://www.imd.gov.in/section/nhac/dynamic/cwind.htm |publisher=India Meteorological Department |accessdate=11 October 2012 |author=Regional Specialised Meteorological Center New Delhi, India |date=October 11, 2012 |archivedate=11 October 2012 |url=http://www.imd.gov.in/section/nhac/dynamic/cwind.htm |url-status=dead }}</ref>

The storm brought high winds and heavy rains to much of Bangladesh, causing extensive damage.<ref name="AAP1"/> At least 1,500 mud, straw, and tin houses were destroyed and 30,000 more were damaged.<ref name="AO1">{{cite web|agency=Agence France-Presse|publisher=AsiaOne|date=October 12, 2012|accessdate=October 12, 2012|title=Bangladesh storm toll rises to 26, scores missing|url=http://www.asiaone.com/News/AsiaOne%2BNews/Asia/Story/A1Story20121012-377275.html}}</ref> Across the country, at least 43 people were killed. Additionally, a total of 106,585 people were affected.<ref name="AI1">{{cite web|publisher=Asian Image|date=October 16, 2012|accessdate=October 17, 2012|title=Aid agency appeals to help Bangladesh storm victims|url=http://www.asianimage.co.uk/news/9987316.Aid_agency_appeals_to_help_Bangladesh_storm_victims/}}</ref> The most significant damage took place in Hatiya where seven people were killed and 1,000 homes were destroyed. Offshore, thousands of fishermen were caught off-guard by the storm and an estimated 1,500 were initially unaccounted for.<ref name="AAP1"/> However, this number was quickly reduced to around 60 the following day.<ref name="AO1"/> According to the police chief of [[Bhola District]], the storm was far stronger than forecast and no warnings for a major storm were made.<ref name="AAP1">{{cite web|agency=Australian Associated Press|work=The Australian|date=October 11, 2012|accessdate=October 11, 2012|title=19 dead, 1500 missing in Bangladesh storm|url=http://www.theaustralian.com.au/news/breaking-news/dead-1500-missing-in-bangladesh-storm/story-fn3dxix6-1226494050190}}</ref> In light of the damage wrought by the storm, [[Oxfam]] called for international aid to the country.<ref name="AI1"/>
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===Cyclonic Storm Murjan===
{{Infobox tropical cyclone small
|Basin=NIO
|Image=Murjan Oct 25 2012.jpg
|Track=Murjan 2012 track.png
|Formed=October 22
|Dissipated=October 26
|3-min winds=40
|1-min winds=35
|Pressure=998
}}
On October 23, the IMD reported that a depression had developed out of an area of low pressure about {{convert|800|km|mi|round=5|abbr=on}} to the west of India's [[Amindivi]] Islands.<ref>{{cite web|title=CWIND Bulletin 1 for Depression ARB 01, 23 October 2012 06z |author=Regional Specialised Meteorological Center New Delhi, India |accessdate=October 23, 2012 |archiveurl=https://www.webcitation.org/6Bd3z6MYb?url=http://gwydir.demon.co.uk/advisories/IMD%20Cyclone%20Warning%20%28CWIND%29_201210230700.htm |archivedate=October 23, 2012 |date=October 10, 2012 |publisher=India Meteorological Department |url=http://www.imd.gov.in/section/nhac/dynamic/cwind.htm |url-status=dead }}</ref> The storm then tracked westwards and intensified into a Deep Depression by 18:00 UTC on the same day, followed by a Tropical Cyclone Formation Alert issued by the Joint Typhoon Warning Center at 20:00 UTC.<ref>{{cite web|last=JTWC |title=Tropical Cyclone Formation Alert WTIO21, Issued at 2000, 23 October 2012 |url=http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/warnings/io9512web.txt |publisher=JTWC |accessdate=23 October 2012 |url-status=dead |archiveurl=https://www.webcitation.org/6Be2oX4tx?url=http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/warnings/io9512web.txt |archivedate=24 October 2012 }}</ref> Late on October 24, the IMD upgraded depression ARB 01 to a cyclonic storm, officially naming it ''Murjan''. Murjan became the first cyclonic storm of the season.<ref>{{cite web|title=CWIND Bulletin 4 for Cyclonic Storm Murjan, 24 October 2012 |author=India Meteorological Department |accessdate=October 24, 2012 |archiveurl=https://www.webcitation.org/6Beimn1gY?url=http://www.imd.gov.in/section/nhac/dynamic/cwind.pdf |archivedate=October 24, 2012 |date=October 24, 2012 |publisher=India Meteorological Department |url=http://www.imd.gov.in/section/nhac/dynamic/cwind.htm |url-status=dead }}</ref> The cyclone continued tracking westward at {{convert|14|kn}}. Microwave satellite imagery depicted that most of the convection remained to the south of the system. At that time, Murjan was tracking just south of a [[subtropical ridge]] in an environment with low [[vertical wind shear]].<ref>{{cite web|title=Tropical Cyclone Advisory 4 for Tropical Cyclone Murjan |publisher=Joint Typhoon Warning Center |accessdate=25 October 2012 |archiveurl=https://www.webcitation.org/6BfdSgW2Q?url=http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/warnings/io0112web.txt |archivedate=25 October 2012 |date=October 24, 2012 |url=http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/warnings/io0112web.txt |url-status=live }}</ref> The storm crossed the coast of Somalia by late 25 October and gradually weakened into a depression.<ref>{{cite web|title=CWIND Bulletin 7 for Cyclonic Storm Murjan, 26 October 2012 |author=India Meteorological Department |accessdate=October 26, 2012 |archiveurl=https://www.webcitation.org/6BhU9VCNW?url=http://www.imd.gov.in/section/nhac/dynamic/cwind.pdf |archivedate=October 26, 2012 |date=October 26, 2012 |publisher=India Meteorological Department |url=http://www.imd.gov.in/section/nhac/dynamic/cwind.pdf |url-status=dead }}</ref> The India Meteorological Department issued their final bulletin for Murjan at 0600 UTC of 26 October 2012.<ref>{{cite web|title=Tropical Weather Outlook for North Indian Ocean issued at 0600 UTC, October 26, 2012 |author=India Meteorological Department |accessdate=October 26, 2012 |archiveurl=https://www.webcitation.org/6BhTYxkUz?url=http://www.imd.gov.in/section/nhac/dynamic/rsmc.pdf |archivedate=October 26, 2012 |date=October 26, 2012 |publisher=India Meteorological Department |url=http://www.imd.gov.in/section/nhac/dynamic/rsmc.pdf |url-status=dead }}</ref>

There were reports of severe flooding in [[Bosaso]] city in [[Somalia]].<ref>{{cite web|title=Somalinet, October 28, 2012 |author=Somalinet |accessdate=October 28, 2012 |archiveurl=https://www.webcitation.org/6BkWzjYt7?url=http://www.somalinet.com/forums/viewtopic.php?t=316433&p=3823445 |archivedate=October 28, 2012 |date=October 28, 2012 |publisher=Somalinet |url=http://www.somalinet.com/forums/viewtopic.php?t=316433&p=3823445#p3823445 |url-status=dead }}</ref> The storm brought strong winds and heavy but beneficial rains within the areas of Bari region (Bossasso, Ishkushban and Bandar Beyla) according to the Somalia Water and Land Information Management.<ref>http://reliefweb.int/report/somalia/heavy-rains-reported-north-eastern-somalia-tropical-storm-murjan-passes-horn-africa</ref>

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===Cyclonic Storm Nilam===
{{Main|Cyclone Nilam}}
{{Infobox tropical cyclone small
|Basin=NIO
|Image=Nilam Oct 31 2012 0805Z.jpg
|Track=Nilam 2012 track.png
|Formed=October 28
|Dissipated=November 1
|3-min winds=45
|1-min winds=50
|Pressure=987
}}
An area of convection crossed the [[Isthmus of Kra]] on 23 October and entered the Bay of Bengal from the Pacific Ocean. It slowly organized itself and the Joint Typhoon Warning Center (JTWC) issued a TCFA at 0330 UTC of 28 October.<ref>{{cite web|last=Joint Typhoon Warning Center |title=Tropical Cyclone Formation Alert WTIO21, Issued at 0330 UTC, 28 October 2012 |url=http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/warnings/wp9312web.txt |publisher=Joint Typhoon Warning Center |accessdate=28 October 2012 |url-status=dead |archiveurl=https://www.webcitation.org/6BkdgMjBo?url=http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/warnings/wp9312web.txt |archivedate=28 October 2012 }}</ref> The India Meteorological Department (IMD) later upgraded the low-pressure area to a Depression on the same day, when the storm was located about {{convert|550|km|mi|round=5|abbr=on}} [[east-northeast]] of [[Trincomalee]], [[Sri Lanka]].<ref>{{cite web|title=CWIND Bulletin 1 for BOB 02, 28 October 2012 |author=India Meteorological Department |accessdate=October 28, 2012 |archiveurl=https://www.webcitation.org/6BkdHqjLR?url=http://www.imd.gov.in/section/nhac/dynamic/cwind.pdf |archivedate=October 28, 2012 |date=October 28, 2012 |publisher=India Meteorological Department |url=http://www.imd.gov.in/section/nhac/dynamic/cwind.pdf |url-status=dead }}</ref> Early on 29th Cctober, BOB 02 was upgraded to a Deep Depression and was put under constant surveillance by the IMD.<ref>{{cite web|title=CWIND advisory number 4 for Deep depression BOB 02 |url=http://gwydir.demon.co.uk/advisories/CWIND_201210290400.pdf |publisher=India Meteorological Department |accessdate=30 October 2012 |url-status=dead |archiveurl=https://www.webcitation.org/6Blscks2N?url=http://gwydir.demon.co.uk/advisories/CWIND_201210290400.pdf |archivedate=29 October 2012 }}</ref> Later that day, the JTWC initiated advisories on the system, designating it with ''02B''.<ref>{{cite web|last=Joint Typhoon Warning Center |title=Tropical Cyclone 02B (Two) Warning 01, Issued at 1500 UTC, 29 October 2012 |url=http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/warnings/io0212web.txt |publisher=Joint Typhoon Warning Center |accessdate=29 October 2012 |url-status=dead |archiveurl=https://www.webcitation.org/6BmQWpHFc?url=http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/warnings/io0212web.txt |archivedate=29 October 2012 }}</ref> The next day, BOB 02 further intensified into a cyclonic storm and was named ''Nilam'' by the IMD.<ref>{{cite web|title=CWIND advisory number 10 for Cyclonic storm Nilam |url=http://gwydir.demon.co.uk/advisories/CWIND_201210300700.pdf |publisher=India Meteorological Department |accessdate=30 October 2012 |url-status=dead |archiveurl=https://www.webcitation.org/6BnppV6hG?url=http://gwydir.demon.co.uk/advisories/CWIND_201210300700.pdf |archivedate=30 October 2012 }}</ref> The name ''Nilam'' was suggested by Pakistan, it is the [[Urdu]] word for [[Sapphire]]. The storm made landfall at peak intensity near [[Mahabalipuram]] on 31 October,<ref>{{cite web|title=CWIND advisory number 21 for Cyclonic Storm Nilam |url=http://www.imd.gov.in/section/nhac/dynamic/cwind.pdf |publisher=India Meteorological Department |accessdate=31 October 2012 |url-status=dead |archiveurl=https://www.webcitation.org/6BpKNmkZp?url=http://www.imd.gov.in/section/nhac/dynamic/cwind.pdf |archivedate=31 October 2012 }}</ref> and started weakening. Reporting that the storm reached a peak intensity of {{convert|55|kn}} (1-min sustained winds), the JTWC issued their last advisory on the system.<ref>{{cite web|title=JTWC Tropical Cyclone Warning 09 for Cyclonic Storm Nilam |url=http://gwydir.demon.co.uk/advisories/WTIO31-PGTW_201210311500.htm |publisher=Joint Typhoon Warning Center |accessdate=1 November 2012 |url-status=dead |archiveurl=https://www.webcitation.org/6BqSivy5K?url=http://gwydir.demon.co.uk/advisories/WTIO31-PGTW_201210311500.htm |archivedate=1 November 2012 }}</ref> In the early hours of November 1, Nilam weakened into a Deep Depression.<ref>{{cite web|title=CWIND advisory number 23 for Cyclonic Storm Nilam |url=http://gwydir.demon.co.uk/advisories/CWIND_201211010200.pdf |publisher=India Meteorological Deprartment |accessdate=1 November 2012 |url-status=dead |archiveurl=https://www.webcitation.org/6BqS8L1Q2?url=http://gwydir.demon.co.uk/advisories/CWIND_201211010200.pdf |archivedate=1 November 2012 }}</ref> As it moved further inland into the [[Rayalaseema]] region of Andhra Pradesh, Nilam further weakened into a Depression.<ref>{{cite web|title=CWIND Advisory number 24 for Cyclonic Storm Nilam |url=http://gwydir.demon.co.uk/advisories/CWIND_201211010300.pdf |publisher=India Meteorological Department |accessdate=1 November 2012 |url-status=dead |archiveurl=https://www.webcitation.org/6BqS8EqSS?url=http://gwydir.demon.co.uk/advisories/CWIND_201211010300.pdf |archivedate=1 November 2012 }}</ref> Nilam dissipated on November 2, over north interior [[Karnataka]].<ref>{{cite web|title=CWIND Advisory number 27 for Cyclonic Storm Nilam |url=http://www.imd.gov.in/section/nhac/dynamic/cwind.pdf |publisher=India Meteorological Department |accessdate=2 November 2012 |url-status=dead |archiveurl=https://www.webcitation.org/6Bs4ur0cO?url=http://www.imd.gov.in/section/nhac/dynamic/cwind.pdf |archivedate=2 November 2012 }}</ref>

The storm brought torrential rains to Sri Lanka. The Puttalam – Mannar road was submerged under about a meter of water near Eluwankulama due to the overflowing of the Kala Oya river. According to the police, a 27-year-old woman was killed when a sand rock fell on her house during heavy rains at [[Habaraduwa]] in [[Galle District]], . Rail services were temporarily suspended when electricity lines fell on the railway track.<ref>{{cite news|last=ColomboPage News Desk|title=Torrential rains cause havoc in Sri Lanka as depression over Bay of Bengal moves in|url=http://www.colombopage.com/archive_12A/Oct29_1351524597KA.php|accessdate=29 October 2012|newspaper=ColomboPage|date=29 October 2012|archive-date=31 October 2012|archive-url=https://web.archive.org/web/20121031062513/http://www.colombopage.com/archive_12A/Oct29_1351524597KA.php|url-status=dead}}</ref> In Chennai, all schools and colleges were closed as 282 schools and 52 community hallwereve been converted into cyclone shelters. Danger signal 7 was hosted in Chennai, [[Ennore]], [[Cuddalore]] and [[Nagapattinam]] ports of Tamil Nadu and in [[Pondicherry|Puducherry]], and danger signal 3 in [[Krishnapatnam]], Vadarevu, [[Machilipatnam]] and [[Nizampatnam]] ports of Andhra Pradesh.<ref>{{cite web|title=Cyclone Nilam to hit Tamil Nadu at 100 kmph|url=http://www.ndtv.com/article/cheat-sheet/cyclone-nilam-to-hit-tamil-nadu-at-100-kmph-286262|publisher=NDTV|accessdate=30 October 2012}}</ref>
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===Deep Depression BOB 03===
{{Infobox tropical cyclone small
|Basin=NIO
|Image=BOB 03 17 November 2012.jpg
|Track=BOB03 2012 track.png
|Formed=November 17
|Dissipated=November 19
|3-min winds=30
|1-min winds=35
|Pressure=1002
}}
A area of low pressure formed in the Bay of Bengal on 12 November. It gradually drifted northwestwards and organized itself until on November 17, when the JTWC issued a TCFA on the system, reporting 30 knot winds at the center.<ref>{{cite web|title=JTWC – Tropical Cyclone Formation Alert – BOB 03 |url=http://weather.noaa.gov/pub/data/raw/wt/wtio21.pgtw..txt |publisher=Joint Typhoon Warning Center |accessdate=17 November 2012 |url-status=live |archiveurl=https://www.webcitation.org/6CEmt4Nb6?url=http://weather.noaa.gov/pub/data/raw/wt/wtio21.pgtw..txt |archivedate=17 November 2012 }}</ref> About half an hour following the TCFA, the IMD upgraded the area of low pressure into a Depression,<ref>{{cite web|last=India Meteorological Department |title=IMD CWIND Bulletin 01 for Depression BOB 03 – 17 November 2012, 0830 UTC |url=http://www.imd.gov.in/section/nhac/dynamic/cwind.pdf |publisher=India Meteorological Department |accessdate=17 November 2012 |url-status=dead |archiveurl=https://www.webcitation.org/6CF4onGJa?url=http://www.imd.gov.in/section/nhac/dynamic/cwind.pdf |archivedate=17 November 2012 }}</ref> and further into a Deep Depression, the same evening.<ref>{{cite web|last=India Meteorological Department |title=IMD CWIND Bulletin 02 for Deep Depression BOB 03 – 17 November 2012, 0230 UTC |url=http://www.imd.gov.in/section/nhac/dynamic/cwind.pdf |publisher=India Meteorological Department |accessdate=17 November 2012 |url-status=dead |archiveurl=https://www.webcitation.org/6CFFs2HEY?url=http://www.imd.gov.in/section/nhac/dynamic/cwind.pdf |archivedate=17 November 2012 }}</ref> BOB 03 developed a well-defined LLCC with increasing deep convection located to the north of the system. In an environment with weak to moderate vertical [[wind shear]] and high sea surface temperatures, the depression intensified further. The same night, the JTWC initiated advisories on the system, classifying it as a tropical storm with one minute sustained winds of 35 knots.<ref>{{cite web|title=JTWC – Tropical Cyclone Warning 01 – Deep Depression BOB 03 |url=http://gwydir.demon.co.uk/advisories/WTIO31-PGTW_201211172100.htm |publisher=Joint Typhoon Warning Center |accessdate=18 November 2012 |url-status=dead |archiveurl=https://www.webcitation.org/6CG9K21uV?url=http://gwydir.demon.co.uk/advisories/WTIO31-PGTW_201211172100.htm |archivedate=18 November 2012 }}</ref> On November 18, BOB 03 encountered strong wind shear from the south west that diminished most of its convection. Soon, the LLCC became fully exposed, as a result of the wind shear. Located just north of a subtropical ridge, BOB 03's inflow was affected by dry air that wrapped the center of the storm.<ref>{{cite web|title=JTWC – Tropical Cyclone Warning 004 – Deep Depression BOB 03 |url=http://weather.noaa.gov/pub/data/raw/wt/wtio31.pgtw..txt |publisher=Joint Typhoon Warning Center |accessdate=18 November 2012 |url-status=dead |archiveurl=https://www.webcitation.org/6CGhHgnYQ?url=http://weather.noaa.gov/pub/data/raw/wt/wtio31.pgtw..txt |archivedate=18 November 2012 }}</ref> The following day, IMD reported the storm had weakened into a depression and was predicted to weaken further.<ref>{{cite web|last=India Meteorological Department |title=Cyclone Warning for Indian Coast – Bulletin 9 issued at 0300 UTC 19 November 2012 |url=http://www.imd.gov.in/section/nhac/dynamic/cwind.pdf |publisher=India Meteorological Department |accessdate=19 November 2012 |url-status=dead |archiveurl=https://www.webcitation.org/6CHXp24XZ?url=http://www.imd.gov.in/section/nhac/dynamic/cwind.pdf |archivedate=19 November 2012 }}</ref> At the same time, JTWC stopped tracking BOB 03, stating that the storm's wind speeds had diminished to below warning criteria.<ref>{{cite web|last=Joint Typhoon Warning Center |title=Tropical Cyclone 03B (Three) Warning 06 issued at 0300 UTC, 19 November 2012 |url=http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/warnings/io0312web.txt |publisher=Joint Typhoon Warning Center |accessdate=19 November 2012 |url-status=dead |archiveurl=https://www.webcitation.org/6CHXfz7RH?url=http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/warnings/io0312web.txt |archivedate=19 November 2012 }}</ref> By 1800 UTC of 19 November 2012, IMD reported the storm had weakened into a well marked low-pressure area and issued their last bulletin for the system. The system later had a few bursts of convection, before dissipating completely off the coast of southern India, on November 20. Tirupathi city recorded a heavy rainfall of 181mm which was the highest in that region.<ref>{{cite web|last=India Meteorological Department |title=Special Tropical Outlook, DEMS-RSMC Tropical Cyclones, New Delhi |url=http://www.imd.gov.in/section/nhac/dynamic/rsmc.pdf |publisher=India Meteorological Department |accessdate=20 November 2012 |url-status=dead |archiveurl=https://www.webcitation.org/6CJ5N2RoG?url=http://www.imd.gov.in/section/nhac/dynamic/rsmc.pdf |archivedate=20 November 2012 }}</ref>

{{clear}}

=== Deep Depression ARB 02 ===
{{Infobox tropical cyclone small
|Basin=NIO
|Image=ARB 02 - 23 December 2012.jpg
|Track=ARB02 2012 track.png
|Formed=December 22
|Dissipated=December 24
|3-min winds=30
|1-min winds=35
|Pressure=1002
}}
Under the influence of an active Inter-Tropical Convergence Zone, a low-pressure area formed over the Arabian Sea near 7.3°N and 70.7°E on 18 December. It slowly tracked westwards, organizing itself and intensifying into a Depression by 0900 UTC of 22 December.<ref name=ARB02Preliminary>{{cite web|last=India Meteorological Department |title=Preliminary Report of Deep Depression ARB 02 |url=http://www.imd.gov.in/section/nhac/dynamic/deepdepression22.pdf |publisher=India Meteorological Department |accessdate=29 January 2013 |url-status=dead |archiveurl=https://www.webcitation.org/6E2UqJUt5?url=http://www.imd.gov.in/section/nhac/dynamic/deepdepression22.pdf |archivedate=29 January 2013 }}</ref> The Joint Typhoon Warning Center (JTWC) upgraded the storm into a Tropical Cyclone by 0300 UTC of 23 December,<ref>{{cite web|last=Joint Typhoon Warning Center |title=Tropical Cyclone 04A (FOUR) Warning Number 1, issued at 0300 UTC, 23 December 2012 |url=http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/warnings/io0412web.txt |publisher=Joint Typhoon Warning Center |accessdate=23 December 2012 |url-status=dead |archiveurl=https://www.webcitation.org/6D7MGnZFD?url=http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/warnings/io0412web.txt |archivedate=23 December 2012 }}</ref> followed by Deep Depression status by the morning hours of the same day. However the storm encountered strong vertical wind shear and colder sea surface temperatures on 24 December,<ref name=ARB02Preliminary /> causing its low-level circulation center to become fully exposed, prompting JTWC to issue its final advisory on the storm. Further weakening ensued as land interaction increased, and the IMD downgraded ARB 02 into a low-pressure area on 25 December.<ref>{{cite web|last=India Meteorological Department |title=IMD CWIND Bulletin 7 for ARB 02, issued at 0600 UTC of 25 December 2012. |url=http://www.imd.gov.in/section/nhac/dynamic/cwind.pdf |publisher=India Meteorological Department |accessdate=25 December 2012 |url-status=dead |archiveurl=https://www.webcitation.org/6DAfTBCAH?url=http://www.imd.gov.in/section/nhac/dynamic/cwind.pdf |archivedate=25 December 2012 }}</ref>
{{clear}}

==Season effects==
This is a table of all storms in the 2012 North Indian Ocean cyclone season. It mentions all of the season's storms and their names, durations, peak intensities (according to the IMD storm scale), damages, and death totals. Damage and death totals include the damage and deaths caused when that storm was a precursor wave or extratropical low, and all of the damage figures are in 2012 USD.

{{North Indian Ocean areas affected (Top)}}
|-
| '''BOB 01''' || {{Sort|01|October 10–11}} || bgcolor=#{{storm colour|TD}}|{{Sort|3|Deep Depression}} || bgcolor=#{{storm colour|TD}}|{{Sort|055|{{convert|55|km/h|mph|abbr=on|round=5}}}} || bgcolor=#{{storm colour|TD}}| {{sort|1002|{{convert|1002|hPa|inHg|sigfig=4|abbr=on}}}} || [[Bangladesh]] || {{Sort|0|Minimal}} || {{Sort|043|43}} ||
|-
| '''Murjan''' || {{Sort|02|October 22–26}} || bgcolor=#{{storm colour|A1}}|{{Sort|2|Cyclonic storm}} || bgcolor=#{{storm colour|A1}}|{{Sort|075|{{convert|75|km/h|mph|abbr=on|round=5}}}} || bgcolor=#{{storm colour|A1}}| {{sort| 998|{{convert|998|hPa|inHg|sigfig=4|abbr=on}}}} || [[Yemen]], [[Somalia]]
|| {{Sort|0|Minimal}} || {{Sort|0|None}} ||
|-
| '''[[Cyclone Nilam|Nilam]]''' || {{Sort|03|October 28 – November 1}} || bgcolor=#{{storm colour|A1}}|{{Sort|1|Cyclonic storm}} || bgcolor=#{{storm colour|A1}}|{{Sort|085|{{convert|85|km/h|mph|abbr=on|round=5}}}} || bgcolor=#{{storm colour|A1}}| {{sort|987|{{convert|987|hPa|inHg|sigfig=4|abbr=on}}}} || [[Sri Lanka]], India || {{Sort|57|56.7 million}} || {{Sort|059|75}} ||
|-
| '''BOB 03''' || {{Sort|04|November 17–19}} || bgcolor=#{{storm colour|TD}}|{{Sort|4|Deep Depression}} || bgcolor=#{{storm colour|TD}}|{{Sort|055|{{convert|55|km/h|mph|abbr=on|round=5}}}} || bgcolor=#{{storm colour|TD}}| {{sort|1002|{{convert|1002|hPa|inHg|sigfig=4|abbr=on}}}} || India || None || None ||
|-
| '''ARB 02''' || {{Sort|05|December 22–24}} || bgcolor=#{{storm colour|TD}}|{{Sort|4|Deep Depression}} || bgcolor=#{{storm colour|TD}}|{{Sort|055|{{convert|55|km/h|mph|abbr=on|round=5}}}} || bgcolor=#{{storm colour|TD}}|{{sort|1002|{{convert|1002|hPa|inHg|sigfig=4|abbr=on}}}} || [[Somalia]] || Unknown || None ||
|-
{{TC Areas affected (Bottom)|TC's=5 systems|dates=October 10 – December 25|winds={{convert|85|km/h|mph|abbr=on|round=5}}|pres={{convert|990|hPa|inHg|sigfig=4|abbr=on}} || damage=56.7 million |deaths=128|Refs=}}

==See also==

*[[Tropical cyclones in 2012]]
* [[2012 Pacific hurricane season]]
* [[2012 Atlantic hurricane season]]
* [[2012 Pacific typhoon season]]
* South-West Indian Ocean cyclone seasons: [[2011–12 South-West Indian Ocean cyclone season|2011–12]], [[2012–13 South-West Indian Ocean cyclone season|2012–13]]
* Australian region cyclone seasons: [[2011–12 Australian region cyclone season|2011–12]], [[2012–13 Australian region cyclone season|2012–13]]
* South Pacific cyclone seasons: [[2011–12 South Pacific cyclone season|2011–12]], [[2012–13 South Pacific cyclone season|2012–13]]

==References==
{{Reflist|2}}

==External links==
*[https://web.archive.org/web/20150517005046/http://www.imd.gov.in/section/nhac/dynamic/cyclone.htm India Meteorological Department]
*[http://www.usno.navy.mil/JTWC/ Joint Typhoon Warning Center]

{{2012 North Indian Ocean cyclone season buttons}}
{{TC Decades|Year=2010|basin=North Indian Ocean|type=cyclone}}

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[[Category:2012 North Indian Ocean cyclone season| ]]
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[[Category:Tropical cyclones in 2012|2012 NIO]]

2012 North Indian Ocean cyclone season - Revision history

CleanupBot II at 17:05, 13 August 2023