Timeline of the 2012 North Indian Ocean cyclone season

The 2012 North Indian Ocean cyclone season is an ongoing event in the annual cycle of tropical cyclone formation. 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.[1] This timeline includes information that was operationally released, meaning that data from post-storm reviews by the IMD, such as a storm that was not operationally warned upon, has not been included. This timeline documents tropical cyclone formations, strengthening, weakening, landfalls, and dissipations during the season.

Track map of all North Indian Ocean tropical cyclones so far in 2012

This season, 3 depressions developed out of the low pressure areas and the remnants of former tropical cyclones. 2 of those depressions strengthened into deep depressions, and both of those storms intensified further into Cyclonic Storms. The first depression of the season developed out of the remnants of Severe Tropical Storm Gaemi on October 10, 2012, very late into the 2012 cyclone season, about 350 km (215 mi) southeast of Kolkata, West Bengal. The depression 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 formed. It developed out of a persistent low in the Arabian Sea. A day later, the depression became the first cyclonic storm of the season, and was named Murjan. It became the first storm to impact the Horn of Africa since Bandu in 2010. Overall, Murjan lasted two and a half days before dissipating over Nugaal region in northeastern Somalia. Only two days later, the third depression of the season formed in southern Bay of Bengal. It eventually strengthened into Cyclonic Storm Nilam, and it made landfall over Southern India early on October 31. Moving further inland, the storm affected two states and caused widespread flooding. Thereafter, Nilam weakened gradually and dissipated on November 2.

Timeline of events
Cyclone Nilam

October
Cyclonic Storm Murjan at peak intensity
Track map of Cyclonic Storm Murjan
Cyclonic Storm Nilam at peak intensity
Track map of Cyclonic Storm Nilam
October 10
October 11
  • 0600 UTC (11:30 a.m. IST) – Depression BOB 01 strengthens into a Deep Depression and makes landfall over Bangladesh coast near Hatiya.[4]
  • 0830 UTC (02:00 a.m. IST) – Deep Depression BOB 01 loses strength after land interaction and dissipates into an area of low pressure.[5]
October 23
  • 0600 UTC (11:30 a.m. IST) – Depression ARB 01 develops from an area of low pressure located about 800 km (495 mi) to the west of India's Amindivi Islands.[6]
  • 1800 UTC (11:30 p.m. IST) – Depression ARB 01 strengthens into a Deep Depression while the Joint Typhoon Warning Center issues a Tropical Cyclone Formation Alert on it.[7]
October 24
  • 1200 UTC (05:30 p.m. IST) – Deep Depression ARB 01 strengthens into the first cyclonic storm of the season with 3-minute sustained winds of 35 knots (65 km/h; 40 mph) and is officially named Murjan.[8]
  • 1500 UTC (08:30 p.m. IST) – The JTWC starts monitoring Murjan as a Tropical Storm with 1-minute sustained winds of 35 knots (65 km/h; 40 mph).[9]
October 25
  • 1500 UTC (08:30 p.m. IST) – Cyclonic Storm Murjan makes landfall over Somalia coast at peak intensity and quickly weakens into a Depression.[10]
October 26
  • 0600 UTC (11:30 a.m. IST) – Depression Murjan dissipates into an area of low pressure.[11]
October 28
  • 0330 UTC (09:00 a.m. IST) – The JTWC issues a TCFA on a gradually developing area of low pressure with deep convection was building over a cloud-covered low level circulation center.[12]
  • 0900 UTC (02:30 p.m. IST) – Depression BOB 02 develops from the area of low pressure located some 550 km (340 mi) to the northeast of Trincomalee, Sri Lanka.[13]
October 29
  • 0000 UTC (05:30 a.m. IST) – Depression BOB 02 strengthens into a Deep Depression with deep convection surrounding the system.[14]
  • 1500 UTC (08:30 p.m. IST) – The JTWC stats monitoring BOB 02 as Tropical Cyclone 02B with windspeeds equivalent to a tropical storm on the Saffir–Simpson Hurricane Scale.[15]
October 30
  • 0300 UTC (08:30 a.m. IST) – Deep Depression BOB 02 strengthens into a Cyclonic Storm roughly 100 km (60 mi) to the northeast of Trincomalee in Sri Lanka.[16]
  • 2300 UTC (October 31–4:30 p.m. IST) – Cyclonic Storm Nilam makes landfall on the Indian Coast near Mahabalipuram and started gradually losing strength.[17]

November
November 1
  • 0300 UTC (08:30 a.m. IST) – Cyclonic Storm Nilam weakens into a Deep Depression after prolonged land-interaction.[18]
  • 0600 UTC (11:30 a.m. IST) – Deep Depression Nilam further weakens into a Depression over the Rayalaseema region of Andhra Pradesh.[19]
November 2
  • 0600 UTC (11:30 a.m. IST) – Depression Nilam dissipates into an area of low pressure over north interior Karnataka.[20]
November 17
  • 0900 UTC (02:30 p.m. IST) – Depression BOB 03 develops from an area of low pressure located some 750 kilometers east-southeast of Visakhapatnam.[21]
  • 1500 UTC (08:30 p.m. IST) – Depression BOB 03 intensifies into a Deep Depression.[22]
  • 2100 UTC (02:30 a.m. IST, on November 18) – The JTWC initiates advisories on Deep Depression BOB 03 reporting 1-minute sustained winds of 35 knots (65 km/h; 40 mph).[23]
November 19
  • 0000 UTC (05:30 a.m. IST) – Deep Depression BOB 03 weakens into a Depression following severe wind shear.[24]
  • 1800 UTC (11:30 p.m. IST) – Depression BOB 03 dissipates into a remnant low.[25]

See also

References
  1. "IMD Cyclone Warning Services: Tropical Cyclones". Archived from the original on May 29, 2009.
  2. Stu Ostro (October 11, 2012). "Hurricane Season: 97L, 98L, 94B and Prapiroon". The Weather Channel. Archived from the original on October 11, 2012.
  3. Regional Specialised Meteorological Center New Delhi, India (October 10, 2012). "Special Tropical Weather Outlook for the North Indian Ocean October 10, 2012 16z". India Meteorological Department. Archived from the original (PDF) on December 26, 2011. Retrieved October 11, 2012.
  4. Regional Specialised Meteorological Center New Delhi, India (October 11, 2012). "Special Tropical Weather Outlook for the North Indian Ocean October 11, 2012 06z". India Meteorological Department. Archived from the original (PDF) on December 26, 2011. Retrieved October 11, 2012.
  5. Regional Specialised Meteorological Center New Delhi, India (October 11, 2012). "Cyclone Warning For Indian Coast, Depression BOB 01, Warning 4". India Meteorological Department. Archived from the original on 16 June 2011. Retrieved 11 October 2012.
  6. Regional Specialised Meteorological Center New Delhi, India (October 10, 2012). "CWIND Bulletin 1 for Depression ARB 01, 23 October 2012 06z". India Meteorological Department. Archived from the original on June 16, 2011. Retrieved October 23, 2012.
  7. JTWC. "Tropical Cyclone Formation Alert WTIO21, Issued at 2000, 23 October 2012". JTWC. Archived from the original on October 24, 2012. Retrieved 23 October 2012.CS1 maint: unfit URL (link)
  8. India Meteorological Department (October 24, 2012). "CWIND Bulletin 4 for Cyclonic Storm Murjan, 24 October 2012". India Meteorological Department. Archived from the original on June 16, 2011. Retrieved October 24, 2012.
  9. "JTWC Tropical Cyclone Advisory 01 on Cyclone Murjan". Joint Typhoon Warning Center. Archived from the original on October 24, 2012. Retrieved 11 November 2012.CS1 maint: unfit URL (link)
  10. India Meteorological Department (October 26, 2012). "CWIND Bulletin 7 for Cyclonic Storm Murjan, 26 October 2012" (PDF). India Meteorological Department. Archived from the original (PDF) on October 9, 2013. Retrieved October 26, 2012.
  11. India Meteorological Department (October 26, 2012). "Tropical Weather Outlook for North Indian Ocean issued at 0600 UTC, October 26, 2012". India Meteorological Department. Archived from the original (PDF) on December 26, 2011. Retrieved October 26, 2012.
  12. "Tropical Cyclone Formation Alert for Cyclone Nilam". Joint Typhoon Warning Center. Archived from the original on October 28, 2012. Retrieved November 1, 2012.CS1 maint: unfit URL (link)
  13. Regional Specialised Meteorological Center New Delhi, India (October 28, 2012). "Special Tropical Weather Outlook for the North Indian Ocean October 28, 2012 11z". India Meteorological Department. Archived from the original (PDF) on December 26, 2011. Retrieved October 31, 2012.
  14. "BOB 02 strengthens into a Deep Depression" (PDF). Met Office. Archived from the original (PDF) on 29 October 2012. Retrieved 11 November 2012.
  15. Joint Typhoon Warning Center (October 29, 2012). "Tropical Cyclone 02B Warning 1 - October 29, 2012 15z". United States Navy, United States Airforce. Archived from the original on October 29, 2012. Retrieved October 31, 2012.
  16. Regional Specialised Meteorological Center New Delhi, India (October 30, 2012). "Special Tropical Weather Outlook for the North Indian Ocean October 30, 2012 06z". India Meteorological Department. Archived from the original (PDF) on December 26, 2011. Retrieved October 31, 2012.
  17. Regional Specialised Meteorological Center New Delhi, India (November 5, 2012). "A Preliminary Report on Cyclonic storm, Nilam over Bay of Bengal" (PDF). India Meteorological Department. pp. 1–7. Archived from the original (PDF) on November 7, 2012. Retrieved November 11, 2012.
  18. "CWIND advisory number 23 for Cyclonic Storm Nilam" (PDF). India Meteorological Deprartment. Archived from the original (PDF) on November 1, 2012. Retrieved November 1, 2012.
  19. "CWIND Advisory number 24 for Cyclonic Storm Nilam" (PDF). India Meteorological Department. Archived from the original (PDF) on 1 November 2012. Retrieved 1 November 2012.
  20. "CWIND Advisory number 27 for Cyclonic Storm Nilam" (PDF). India Meteorological Department. Archived from the original (PDF) on 9 October 2013. Retrieved 2 November 2012.
  21. India Meteorological Department. "IMD CWIND Bulletin 01 for Depression BOB 03 - 17 November 2012, 0830 UTC" (PDF). India Meteorological Department. Archived from the original (PDF) on 9 October 2013. Retrieved 17 November 2012.
  22. India Meteorological Department. "IMD CWIND Bulletin 02 for Deep Depression BOB 03 - 17 November 2012, 0230 UTC" (PDF). India Meteorological Department. Archived from the original (PDF) on 9 October 2013. Retrieved 17 November 2012.
  23. "JTWC - Tropical Cyclone Warning 01 - Deep Depression BOB 03". Joint Typhoon Warning Center. Archived from the original on 18 November 2012. Retrieved 18 November 2012.
  24. India Meteorological Department. "Cyclone Warning for Indian Coast - Bulletin 9 issued at 0300 UTC 19 November 2012" (PDF). India Meteorological Department. Archived from the original (PDF) on 9 October 2013. Retrieved 19 November 2012.
  25. India Meteorological Department. "Special Tropical Outlook, DEMS-RSMC Tropical Cyclones, New Delhi". India Meteorological Department. Archived from the original (PDF) on 26 December 2011. Retrieved 20 November 2012.
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