2009 North Indian Ocean cyclone season
The cyclone season in 2009 Nordindik had no official boundaries as is usual in other basins, but ran throughout the year. However, the tropical cyclones form in this basin is usually from April to December, the months before and after the monsoon season, ie April / May and October / November, which are most active. A tropical cyclone in the Indian Ocean is called the cyclone.
The Regional Specialized Meteorological competent Centre ( RSMC ) is the India Meteorological Department in New Delhi. This awards for those tropical cyclones that reach at least the status of a cyclone, a name. Low pressure areas ( depending on the wind speed Depression or deep depression ) are numbered consecutively, with the letters BOB indicates that the system formed in the Bay of Bengal. The letters ARB are mutatis mutandis to the Arabian Sea.
Through the Joint Typhoon Warning Center ( JTWC ) in Honolulu independent forecasts and warnings are issued for the U.S. facilities in the Indian Ocean. By the JTWC classification according to the Saffir -Simpson Hurricane Scale, the RSMC used for classification own criteria occurs at, which include the measurement of the ongoing wind speed is based on the basis of a three-minute observation.
Storm names
Tropical cyclones in the Indian Ocean are named by the RSMC the India Meteorological Department. The names are used once, so there is no name of devastating storms are deleted after the end of the season from the list of names of tropical cyclones.
- Bijli
- Aila
- Phyan
- Ward
- Laila ( not awarded)
- Bandu ( not awarded)
- Phet ( not awarded)
Storms
Cyclonic Storm Bijli
On April 13, reached an area of atmospheric convection with showers and thunderstorms over the central Bay of Bengal slightly better organizing. During the day they formed under the convection, a low pressure system, also developed at the periphery of the system weak rain bands. On April 14, deepened around the center of circulation, the convection and accordingly classified the RSMC New Delhi the system as Depression BOB 01 Early the next day the JTWC reported that the depression had intensified to tropical cyclone 01B. Due to a high pressure area over India, the storm moved west- northwest. On the same morning downgraded the RSMC depression to deep depression and high clock at 15:00 UTC classified the RSMC system for cyclonic storm Bijli high. For the four ports in Orissa storm warnings were issued as danger threatened by the high surf.
On April 16, the storm turned and walked parallel to the east coast of India to the northeast. 6:00 clock UTC on April 16, the storm reached its peak intensity with continuous three-minute winds from 75 km / h. Early the next day the RSMC New Delhi reported the attenuation Bijlis in a deep depression that moved to the north-west and arrived in Chittagong, Bangladesh on land. On April 18, the system broke up over the mountain country.
Severe cyclonic storm Aila
Late on May 21, the JTWC reported a tropical disturbance, whose center was located about 515 nautical miles ( about 955 km ) south of the Indian city of Calcutta. The disturbance was at this time from a broad and poorly organized convection area southeast of the near-surface circulation; this had been consolidated into a circulation center in the twelve hours before. Because the system was embedded in a region of low vertical wind shear and the surface warm enough in this area, the area of low pressure developed into a tropical cyclone. On May 22, the system was classified by the RSMC New Delhi as Depression BOB 02.
The center of the cyclone swept over the western Sundarbans and dissipated over land; However, Aila had country still almost 15 hours, the strength of a cyclone. This was due, that was still partially above the river delta of the Ganges, near the coast to the Bay of Bengal. To the west of Bangladesh, the storm surge reached according to media reports three meters, the Sundarbans were flooded up to six feet high, about two feet higher than the normal tidal range. Due to the effects of the cyclone were in the Indian states of West Bengal and Sikkim about 100 people killed, destroyed 61,000 houses and damaged more than 132,000. Impact did the cyclone in Orissa. The heaviest rainfall were measured on 25 May in Paradip with around 260 mm. The storm was the first cyclone since 1989, who went on across West Bengal in the month of May. In Bangladesh cyclone Aila killed 175 people.
Depression ARB 01
In the early morning of June 21, the JTWC, the about 675 km southwest of Mumbai has formed a depression reported. Multi-spectral images revealed that the disorder was training a ground-level circulation center, convection, and was located in an environment with low vertical wind shear. During the following two days the disturbance developed further and consolidated itself. The RSMC New Delhi has since found on June 23, which has formed the depression ARB 01 and predicted an intensification of the system to a deep depression. However, this intensification before landfall did not take place in the afternoon of the day the system arrived in the south of Gujarat over land. The well-marked low pressure area moved to the northeast and into the Arabian Sea, where it is again increased to depression. In the early morning of June 26 to Depression ARB 01 disbanded.
Unusually heavy thunderstorms that were with the area of low pressure associated, killing at least nine people in the South Indian state of Gujarat. More than 100 mm of rainfall were received on June 23 before the landfall down over Gujarat.
Depression ARB 02
Deep Depression BOB 03
Presented early on July 20, fixed the RSMC New Delhi that has become the Depression BOB 03 formed about 120 km south-east of Digha in the Bay of Bengal. Convection had steadily better organized and was located in an area with mild to moderate vertical wind shear. The depression strengthened further was the same afternoon to a deep depression. Then the system crossed the coast at the border of the states of Orissa and West Bengal. Overland, the system continuously weakened.
Deep Depression BOB 04
Early in the morning of the 3rd of September, the IMD noted that had formed a low pressure area within the monsoon trough off the coast of Orissa. The system continued to evolve. The strong convection area began to consolidate to a ground-level circulation center within easy vertical wind shear. On September 5, the IMD reported the intensification of the low pressure area to a depression. During the day, the depression to a Deep Depression intensified; according to the criteria of the JTWCs reached cyclone 03B already wind speeds tropical storm. However, the JTWC not continued to watch the storm, because this already moved in Digha in West Bengal over land and should be resolved according to the forecasts during the day already. The IMD continued the observations of the system still continued until September 7. At this time was the center of the now graduated system over Jharkhand and its neighboring region of Chhattisgarh.
In Digha a person drowned after being carried away by the flood. The highest rainfall caused by the system amounted to 76 mm.
Cyclonic storm Phyan
The cyclonic storm Phyan was located late on November 4, southwest of Colombo in Sri Lanka. During the next days the disturbance developed steadily before November 7, arrived in the south of the Indian subcontinent over the country. The disturbance crossed the mainland and arrived late on November 8 on the Arabian Sea, where they are to depression ARB 03 intensified until November 9. The system swerved to the northeast, and after a further intensification of the cyclonic storm, the system was given the name Phyan.
Cyclonic storm Ward
On December 10, the RSMC New Delhi announced that about 400 km east- southeast of Batticaloa, Sri Lanka has the depression formed BOB 05. The system intensified the following day to the cyclonic storm Ward. Ward wandered for some time about east of Sri Lanka, before the system came as a deep depression near Trincomalee on 14 December over the country.