1984 North Indian Ocean cyclone season

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1984 North Indian Ocean cyclone season
1984 North Indian Ocean cyclone season summary.jpg
Season summary map
Seasonal boundaries
First system formedMay 23, 1984
Last system dissipatedDecember 10, 1984
Strongest storm
NameCyclone Three
  Maximum winds215 km/h (130 mph)
(3-minute sustained)
  Lowest pressure973 hPa (mbar)
Seasonal statistics
Cyclonic storms4
Total fatalities430
Total damageUnknown
Related articles
North Indian Ocean tropical cyclone seasons
1982, 1983, 1984, 1985, 1986

The 1984 North Indian Ocean cyclone season was part of the annual cycle of tropical cyclone formation. The season has no official bounds but cyclones tend to form between April and December. These dates conventionally delimit the period of each year when most tropical cyclones form in the northern Indian Ocean. There are two main seas in the North Indian Ocean—the Bay of Bengal to the east of the Indian subcontinent and the Arabian Sea to the west of India. The official Regional Specialized Meteorological Centre in this basin is the India Meteorological Department (IMD), while the Joint Typhoon Warning Center (JTWC) releases unofficial advisories. An average of five tropical cyclones form in the North Indian Ocean every season with peaks in May and November. [1] Cyclones occurring between the meridians 45°E and 100°E are included in the season by the IMD. [2]

Contents

Systems

Tropical Storm One (1A)

Tropical storm (SSHWS)
01A May 27 1984 0436Z.jpg   Cyclone 01A 1984 track.png
DurationMay 23 – May 28
Peak intensity85 km/h (50 mph) (1-min) 990  hPa  (mbar)

On May 23 a tropical disturbance developed 180nm (333km) southwest off the island of Socotra. The disturbance moved slowly northwestward as it developed into a tropical depression on May 24, as the system gradually strengthened to a tropical storm on May 26 and being designated 01B by the JTWC. Shortly after being designated, 01B began a gradual turn to the west, then southwest as it entered the Gulf of Aden. 01B attained its peak intensity of 50 mph early on May 27, before weakening until making landfall 35 nm (65km) west of Berbera, Somalia as a 40 mph tropical storm early on May 28. The storm rapidly dissipated overland that same day. There were no reports of damages or deaths from the storm. [3]

The storm was not tracked by the IMD.

Tropical Storm Two (2B)

Very severe cyclonic storm (IMD)
Tropical storm (SSHWS)
02B Oct 12 1984 2242Z.png   Cyclone 02B 1984 track.png
DurationOctober 9 – October 14
Peak intensity120 km/h (75 mph) (3-min) 980  hPa  (mbar)

A broad and disorganized area of convection was first detected on October 9 in the north-central Bay of Bengal. The disturbance developed into a tropical depression on October 10. The depression moved north into very favorable upper-level and shear conditions. The JTWC subsequently upgraded the depression into a tropical storm, being designated as 02B. However, land interaction and outflow from a developing Tropical Storm Susan in the South China Sea inhibited any further development into a stronger system. 02B then moved slightly northwest as it attained its peak intensity of 50 mph, This was short-lived as strong upper-level shear began impacting the storm, gradually weakening it until making landfall 10nm (19 km) south of Balasore on October 14, before rapidly weakening overland and disspating that same day. Heavy rains were reported, but death and damage figures are unknown. [3]

Cyclone Three (3B)

Extremely severe cyclonic storm (IMD)
Category 2 tropical cyclone (SSHWS)
03B Nov 13 1984 1014Z.jpg   Cyclone 03B 1984 track.png
DurationNovember 9 – November 15
Peak intensity215 km/h (130 mph) (3-min) 975  hPa  (mbar)

A large disturbance was first noticed by the JTWC west of Sumatra on November 5. The disturbance moved slowly northwestward with little or no change in organization until November 9, when it finally developed into a tropical depression. The depression slowly intensified into a tropical storm late on November 10, and the JTWC designated it 03B. 03B then began to rapidly intensify, going from a 40 mph tropical storm to a 80 mph cyclone in less than 24 hours as it began turning north. Strengthening slowed down as it peaked as a 100 mph category 2 cyclone on November 13, before just stalling offshore Sriharikota. 03B then began being impacted by upwelling and a dramatic increase in wind shear on November 14, before being reduced to a mere convectionless low-level circulation as it made landfall just south of Nellore on November 15 and dissipating thereafter. [3]

Due to the storm's stall, Storm surge of 20 ft hit the nearby village of Durgarajupatnam which led to coastal inundation up to 3 km inland. Nearly 100,000 livestock were killed by the storm and 400,000 houses were destroyed in Andhra Pradesh. In nearby Tamil Nadu, the storm brought moderate damages killing 54 people. [3]

Cyclone Four (4B)

Extremely severe cyclonic storm (IMD)
Category 1 tropical cyclone (SSHWS)
04B Dec 1 1984 0600Z.png   Cyclone 04B 1984 track.png
DurationNovember 27 – December 8
Peak intensity215 km/h (130 mph) (3-min) 973  hPa  (mbar)

A large area of convection formed in the southwestern area of the Bay of Bengal on November 20. Over the next week, the disturbance moved in a semi-circular path, eventually developing into a tropical depression on November 27. The depression gradually strengthened into a tropical storm on November 28, 04B then began a two day clockwise loop in the central Bay of Bengal, strengthening into a category 1 cyclone on November 30, eventually peaking as a 85 mph cyclone as it made landfall 40 nm (70km) north of Nagapattinam on December 1. 04B then rapidly weakened overland before restrengthening back into a tropical depression over the eastern Arabian Sea on December 2. 04B reattained tropical storm status late on December 3, as it gradually restrengthened into a 70 mph tropical storm on December 5. 04B kept this intensity for a day as shear increased as it approached southern Somalia, making landfall as a dissipating tropical storm on December 7. The system fully dissipated as it reemerged into the Arabian Sea on December 8. [3]

See also

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References

  1. "Frequently Asked Questions: What is the annual frequency of Cyclones over the Indian Seas? What is its intra-annual variation?". India Meteorological Department. 2012. Archived from the original on May 21, 2015. Retrieved June 8, 2012.
  2. "Bulletins Issued by Regional Specialized Meteorological Centre (RSMC) – Tropical Cyclones, New Delhi" (PDF). India Meteorological Department. May 25, 2009. Archived from the original (PDF) on 2012-04-12. Retrieved July 16, 2012.
  3. 1 2 3 4 5 1984 Annual Tropical Cyclone Report (PDF) (Report). Joint Typhoon Warning Center. pp. 135, 145. Retrieved December 6, 2018.