The 1999 North Indian Ocean cyclone season was an extremely active and deadly tropical cyclone season in recent times. It was an event in the annual cycle of

tropical cyclone A tropical cyclone is a rapidly rotating storm system with a low-pressure area, a closed low-level atmospheric circulation, strong winds, and a spiral arrangement of thunderstorms that produce heavy rain and squalls. Depending on its locat ...

formation. The North Indian Ocean cyclone season has no official bounds, but cyclones tend to form between April and December, with peaks in May and October-November. These dates conventionally delimit the period of each year when most tropical cyclones form in the northern Indian Ocean. The scope of this article is limited to the Indian Ocean in the

Northern Hemisphere The Northern Hemisphere is the half of Earth that is north of the equator. For other planets in the Solar System, north is defined by humans as being in the same celestial sphere, celestial hemisphere relative to the invariable plane of the Solar ...

, east of the

Horn of Africa The Horn of Africa (HoA), also known as the Somali Peninsula, is a large peninsula and geopolitical region in East Africa.Robert Stock, ''Africa South of the Sahara, Second Edition: A Geographical Interpretation'', (The Guilford Press; 2004), ...

and west of the

Malay Peninsula The Malay Peninsula is located in Mainland Southeast Asia. The landmass runs approximately north–south, and at its terminus, it is the southernmost point of the Asian continental mainland. The area contains Peninsular Malaysia, Southern Tha ...

. There are two main seas in the North Indian Ocean – the

Arabian Sea The Arabian Sea () is a region of sea in the northern Indian Ocean, bounded on the west by the Arabian Peninsula, Gulf of Aden and Guardafui Channel, on the northwest by Gulf of Oman and Iran, on the north by Pakistan, on the east by India, and ...

to the west of the

Indian subcontinent The Indian subcontinent is a physiographic region of Asia below the Himalayas which projects into the Indian Ocean between the Bay of Bengal to the east and the Arabian Sea to the west. It is now divided between Bangladesh, India, and Pakista ...

, abbreviated ''ARB'' by the

India Meteorological Department India Meteorological Department (IMD) is an Indian agency of the Ministry of Earth Sciences of the Government of India. It is the principal agency responsible for meteorological observations, weather forecasting and seismology. IMD is headquar ...

(IMD); and the

Bay of Bengal The Bay of Bengal is the northeastern part of the Indian Ocean. Geographically it is positioned between the Indian subcontinent and the Mainland Southeast Asia, Indochinese peninsula, located below the Bengal region. Many South Asian and Southe ...

to the east, abbreviated ''BOB'' by the IMD. The official

Regional Specialized Meteorological Centre A Regional Specialized Meteorological Centre (RSMC) is responsible for the distribution of information, advisories, and warnings regarding the specific program they have a part of, agreed by consensus at the World Meteorological Organization as ...

in this basin is the

(IMD), while the

Joint Typhoon Warning Center The Joint Typhoon Warning Center (JTWC) is a joint United States Navy – United States Air Force command in Pearl Harbor, Hawaii. The JTWC is responsible for the issuing of tropical cyclone warnings in the North-West Pacific Ocean, South P ...

releases unofficial advisories. The

tropical cyclone scale Tropical cyclones are ranked on one of five tropical cyclone intensity scales, according to their maximum sustained winds and which tropical cyclone basins they are located in. Only a few classifications are used officially by the meteorologica ...

for this basin is detailed on the right. On average, 4 to 6 storms form in this basin every season. The season produced an above-average number of cyclonic storms but there was a very above-average number of intense cyclones. In May, a Category 3 cyclone struck Pakistan, leaving 6,400 people dead. In October, two very intense cyclones struck eastern India within two weeks of each other with the latter becoming the most intense Northern Indian Ocean cyclone on record, leaving over 10,000 people dead and causing more than $5.4 billion (1999 USD) in damages. __TOC__

Season summary

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During the 1999 season, a total of ten tropical cyclones were observed. The

, the official

Regional Specialized Meteorological Center A Regional Specialized Meteorological Centre (RSMC) is responsible for the distribution of information, advisories, and warnings regarding the specific program they have a part of, agreed by consensus at the World Meteorological Organization as ...

of the North Indian Ocean basin, identified eight of them. The

unofficially tracked two additional cyclones, 03B and 31W, during the course of the season.

Systems

Severe Cyclonic Storm BOB 01

On January 30, an area of disturbed weather began to develop. Convection began to form around the center and a Tropical Cyclone Formation Alert was issued the next day by the JTWC. Development of the storm stalled and the alert was cancelled. The next day, another TCFA was issued but was once more cancelled. Finally, on February 2, after the third TCFA was issued, the low pressure area developed into a tropical storm at 0900Z 370 nm west of

Phuket, Thailand Phuket (; , , or ''Tongkah'') is one of the southern provinces (''changwat'') of Thailand. It consists of the island of Phuket, the country's largest island, and another 32 smaller islands off its coast. Phuket lies off the west coast of m ...

. The storm slowly intensified and reached its peak of 45 mph (1-min) on February 3. Shortly after peaking in intensity, vertical wind shear weakened the storm and the low became exposed by 1800Z the same day. The storm later dissipated on February 5 without making landfall.

Extremely Severe Cyclonic Storm ARB 01 (02A)

An area of disturbed weather in the

was monitored in early May for possible development. Over the next two weeks, strong convection would develop before sunrise but dissipate by sunset. By May 16, the convection had become constant and a TCFA was issued at 0100Z. The low became a tropical storm by 0900Z. Tropical Storm 02A intensified as it moved to the northwest and reached cyclone status on May 17 at 0600Z. At that time, a mid-latitude trough weakened the subtropical ridge, allowing 02A to curve into

Pakistan Pakistan, officially the Islamic Republic of Pakistan, is a country in South Asia. It is the List of countries and dependencies by population, fifth-most populous country, with a population of over 241.5 million, having the Islam by country# ...

. 02A continued to intensify and by May 19, it had reached its peak of 125 mph (205 km/h), just below Category four status on the SSHS. 02A made landfall on May 20 near

Karachi, Pakistan Karachi is the capital city of the Administrative units of Pakistan, province of Sindh, Pakistan. It is the List of cities in Pakistan by population, largest city in Pakistan and 12th List of largest cities, largest in the world, with a popul ...

at peak intensity. The storm began to dissipate as it continued inland over the Indus River Valley on May 21 and completely dissipated the next day. The cyclone struck the same area which had been hit hard by Tropical Cyclone 03A, a category three as well, almost exactly a year prior. It proved to be very deadly with 6,400 people reported to be dead. Damages totaled to $6 million (1999 USD). 02A was the strongest storm to ever form in the Arabian Sea until 2001, when cyclone 01A became the strongest storm to form in the Arabian Sea. It was itself surpassed in

2007 2007 was designated as the International Heliophysical Year and the International Polar Year. Events January * January 1 **Bulgaria and Romania 2007 enlargement of the European Union, join the European Union, while Slovenia joins the Eur ...

when

Cyclone Gonu Super Cyclonic Storm Gonu was an extremely powerful tropical cyclone that became the strongest cyclone on record in the Arabian Sea. The second named tropical cyclone of the 2007 North Indian Ocean cyclone season, Gonu developed from a pe ...

became the first category five to form in the Arabian Sea. That would itself be surpassed again in 2019 when

Cyclone Kyarr Super Cyclonic Storm Kyarr () was an extremely powerful tropical cyclone that became the first super cyclonic storm in the North Indian Ocean since Gonu in 2007. It was also the second strongest tropical cyclone in the Arabian Sea and one ...

became the most intense system in the Arabian Sea.

Tropical Storm 03B

On June 8, an area of low pressure formed 235 nm south of

Chittagong, Bangladesh Chittagong ( ), officially Chattogram, (, ) (, or ) is the second-largest city in Bangladesh. Home to the Port of Chittagong, it is the busiest port in Bangladesh and the Bay of Bengal. The city is also the business capital of Bangladesh. It ...

. The low slowly developed over the next two days while drifting to the west and northwest. On June 10, a TCFA was issued at 0830Z and the first warning on Tropical Storm 03B was issued at 1500Z the same day. The storm made landfall as a minimal tropical storm to the west of

Calcutta, India Kolkata, also known as Calcutta ( its official name until 2001), is the capital and largest city of the Indian state of West Bengal. It lies on the eastern bank of the Hooghly River, west of the border with Bangladesh. It is the primary fin ...

later that day. 03B rapidly weakened due to vertical wind shear and the interaction with land and dissipated on June 11. No fatalities or damages have been associated with 03B.

Deep Depression BOB 02

A weak depression existed on June 17 before it made landfall near

Berhampur Berhampur (; also known as Brahmapur) is a city on the eastern coastline of Odisha, India. Known as the "Silk City" it is the headquarter of Ganjam district, Ganjam district and home to Odisha's one of the major and the oldest railway station ...

. The depression was monitored by the IMD, not the JTWC.

Deep Depression BOB 03

A depression formed on July 27, strengthened slightly before moving inland into the Odisha state on July 28. The depression was monitored by the IMD, not the JTWC.

Depression BOB 04

A depression formed in the northern Bay of Bengal on August 6 and moved inland into the Odisha state the next day. It was dissipated by August 8. The depression was monitored by the IMD, not the JTWC.

Extremely Severe Cyclonic Storm BOB 05 (04B)

On October 15, a developing area of low pressure, located 220 nm northwest of the

Andaman Islands The Andaman Islands () are an archipelago, made up of 200 islands, in the northeastern Indian Ocean about southwest off the coasts of Myanmar's Ayeyarwady Region. Together with the Nicobar Islands to their south, the Andamans serve as a mari ...

began to intensify. By 1730Z a TCFA was issued and the first advisory on Tropical Storm 04B was issued at 2100Z. 04B was moving to the west-northwest at 8–12 knots as it continued to intensify. On October 17, the storm began to turn to a more northerly direction as it intensified to a cyclone. 04B underwent explosive intensification the same day and reached its peak of 140 mph at 0000Z. The storm held this intensity as it made landfall on the Odisha coastline near Gopalpur beach. The storm began to weaken due to the interaction with land and dissipated on October 19. 04B was responsible for 198 fatalities and hundreds of houses and huts in low-lying areas were destroyed by flooding. Several thousand others were injured by the storm and hundreds were left homeless. The Prime Minister of India requested that relief supplies be distributed to the affected region immediately.

Super Cyclonic Storm BOB 06 (05B)

On October 23, a Tropical Cyclone Formation Alert (TCFA) was issued by the JTWC for an area of low pressure in the

South China Sea The South China Sea is a marginal sea of the Western Pacific Ocean. It is bounded in the north by South China, in the west by the Indochinese Peninsula, in the east by the islands of Taiwan island, Taiwan and northwestern Philippines (mainly Luz ...

. The low did not develop further and the TCFA was cancelled. On October 25, the low crossed the Malay Peninsula. Later that day, the system reorganized and another TCFA was issued at 1930 UTC, with advisories for Tropical Cyclone 05B initiated early the next morning. The storm tracked to the northwest and continued to intensify quickly; peaking as a 160 mph category five late on October 28. 11 hours after peaking, 05B weakened slightly to 155 mph and made landfall near the same area that 04B had only 11 days prior. The storm slowly weakened as it stalled just onshore in

Odisha Odisha (), formerly Orissa (List of renamed places in India, the official name until 2011), is a States and union territories of India, state located in East India, Eastern India. It is the List of states and union territories of India by ar ...

India India, officially the Republic of India, is a country in South Asia. It is the List of countries and dependencies by area, seventh-largest country by area; the List of countries by population (United Nations), most populous country since ...

while dumping torrential rains. The storm reemerged into the Bay of Bengal on October 31 as a 45 mph tropical storm. 05B slowly weakened as it drifted southward. 05B weakened to a tropical depression on October 31, before dissipating on November 4. Damage from the cyclone was tremendous. Flooding from the storm's rain was described as being the worst in 100 years as well as the worst in India's post-independence history. The storm claimed the lives of at least 9,887 people and 406,000 livestock. Damages from the storm totaled to $4.44 billion (1999 USD).

Tropical Depression 31W

The remnants of this storm from the Western Pacific basin entered the

Andaman Sea The Andaman Sea (historically also known as the Burma Sea) is a marginal sea of the northeastern Indian Ocean bounded by the coastlines of Myanmar and Thailand along the Gulf of Martaban and the west side of the Malay Peninsula, and separated f ...

on December 5 but redevelopment did not occur.

Depression BOB 07

A Tropical Depression formed in the Bay of Bengal on December 8. The depression was monitored by the IMD, not the JTWC. The depression remained out over open waters before dissipating on December 10.Northern Hemisphere 1999 Tropical Cyclone Season Review
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Season effects

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Sri Lanka Sri Lanka, officially the Democratic Socialist Republic of Sri Lanka, also known historically as Ceylon, is an island country in South Asia. It lies in the Indian Ocean, southwest of the Bay of Bengal, separated from the Indian subcontinent, ...

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Myanmar Myanmar, officially the Republic of the Union of Myanmar; and also referred to as Burma (the official English name until 1989), is a country in northwest Southeast Asia. It is the largest country by area in Mainland Southeast Asia and has ...

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Thailand Thailand, officially the Kingdom of Thailand and historically known as Siam (the official name until 1939), is a country in Southeast Asia on the Mainland Southeast Asia, Indochinese Peninsula. With a population of almost 66 million, it spa ...

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References

External links

Primer for Parliamentarians

Gary Padgett Summaries

JTWC Archive
{{DEFAULTSORT:1999 North Indian Ocean Cyclone Season