2007 North Indian Ocean cyclone season

The cyclone season in the northern Indian Ocean in 2007 was an event of the annual cycle of tropical cyclone formation. It has no official boundaries, but tend cyclones to form in the Indian Ocean between the Horn of Africa and the Malay Peninsula from April to December, and there are two highlights of the activity, namely in May and in November. The storm system according to their area of ​​origin by the two major overseas territories are divided. These are the Arabian Sea west of the Indian subcontinent and the Bay of Bengal to the east of it.

In the long-term average form in this basin four to six storms per season. The official Regional Specialized Meteorological Centre in this basin is located in New Delhi and is operated by the India Meteorological Department (IMD ), while the Joint Typhoon Warning Center issues storm warnings, primarily aimed at institutions in the United States. Storms that form in the Arabian Sea, get the abbreviation ARB prior to their serial number, and in the resulting systems in the Bay of Bengal the letters BOB sinngemaß prefixed.

The year 2007 brought an unusually active for this pool season, and by this time it was expected after the damage momentous season since records began; since the season was in this respect surpassed only by the 2008 season. In the 2007 season, two cyclone category 5 were first observed after the Saffir - Simpson scale in this basin; In addition, the Cyclones Sidr and Gonu were the first two cyclones in this strength since the introduction of naming in this basin. At least 4545 people were killed by the impact of tropical storms and depressions, and the reported damage was summed up to 6.4 billion U.S. dollars.

Storms

Depression BOB 01

An area of ​​disturbed weather formed on April 26, east of the Malay peninsula. The system consolidated slowly and the Thai Meteorological Department (TMD ) classified the system on 1 May in the Gulf of Thailand as a tropical depression. The system moved westward, moved to Chumphon over land, crossed the Isthmus of Kra and then got into the Andaman Sea. The system intensified slightly and was late on May 3 at the India Meteorological Department (IMD ) classified as depression. This then began to move to the north and crossed the morning of May 5, the coast of Rakhine State in Myanmar for the second time. After landfall, the system weakened to a low pressure area and the RSMC gave his last report concerning the system.

Cyclonic Storm Akash

On May 13, the India Meteorological Department classified a depression over the central Bay of Bengal, which had been formed on 10 May and steadily intensified shortly after the Joint Typhoon Warning Center Tropical Cyclone had a Forming Alert proclaimed. During the day the JTWC downgraded the system boots to a tropical cyclone and described it as 01B. On May 14, the IMD classified the system as a deep depression, and six hours later for the first cyclonic storm of the season. Akash intensified further to reach the JTWC 's view on May 14 one-minute wind speeds in hurricane strength. Early on May 15, Akash crossed the coast near the border between Bangladesh and Myanmar. Overland, the storm weakened rapidly. The name Akash was proposed by India and is the word for sky in Hindi.

At least one fisherman was killed by Akash, but recorded the authorities after the passage of the storm about 100 other missing fishermen. On land, there was damage to the crop and to interruptions in power supply. Approximately 80,000 residents were evacuated before arrival of the storm. The Chittagong port was closed and all flights to and from the city were canceled.

Due to the heavy rain, which was caused by the outer rain bands of the storm, had to dispense with the third cricket match between India and Bangladesh.

Super Cyclonic Storm Gonu

Gonu developed on June 1 from an existing field with Konvektionstätigkeit in the east of the Arabian Sea. Due to good conditions in height and a warm water surface, the storm intensified rapidly to its peak on June 3, with ongoing three-minute sustained winds of 240 km / h Although weakened Gonu because drier air and cooler water off, but when the cyclone late on June 5 hit on the eastern tip of Oman, he was with the landfall of strongest tropical cyclone, which hit the Arabian Peninsula since the beginning of reliable recording. Storms of similar intensity are otherwise rarely in the Arabian Sea, because storms in this area are rather small and tend to a rapid resolution.

On the east coast of Oman Gonu invited from strong rainfall that reached locally up to 610 mm and triggered severe flooding. The cyclone caused damage to property in the country in the amount of 4 billion U.S. dollars ( in 2007 prices, in today's prices 5 billion U.S. dollars). By the most serious natural disaster in this country, 49 people were killed in Oman. In Iran, died from the effects of the storm 23 people. Here property damage was reported in the amount of 215 million U.S. dollars ( in 2007 prices, in current prices, 0 million U.S. dollars).

Cyclonic Storm Yemyin

A low pressure system in conjunction with a monsoon trough were first collected by the Naval Research Laboratory on June 17, the Bay of Bengal. During the following days, the system developed a flickering deep convection in the vicinity of an excepted ground-level circulation center, which drifted through the open lake. Despite moderate to high vertical wind shear, the disturbance generated in Port Blair in the Andaman Islands on June 19, a decrease of air pressure up to 2.7 mbar ( hPa). Convection remained an increasingly well -defined ground-level circulation center, and the fault was consolidated under favorable Diffluenz on.

Early on June 21, said the India Meteorological Department (IMD ), the system to a depression, about 430 km east- southeast of Kakinada in the Indian state of Andhra Pradesh.Einige hours later gave the Joint Typhoon Warning Center ( JTWC ) Tropical Cyclone Formation Alert a and warned against one-minute wind speeds of nearly 55 km / h The depression moved rapidly west- northwestward toward the northern coastal district of Andhra Pradesh. A subtropical ridge to the north weakened the wind shear that paralyzed the system up to that point, and allowed the further intensification. During the day the IMD classified the system for Deep Depression high. While the organized convection and the system was moving over increasingly warm water, the JTWC began with the publication of regular storm warnings for Tropical Cyclone 03B.

The deep depression moved in with Kakinda early on June 22, local time on land. The JTWC issued a little later from his last warning to the system, since this began to weaken due to the action of the mainland and from wind shear. The next day, the IMD, the system classified into a depression back, whereas on the Deccan Plateau.zog. On June 24, there was RSMC his last warning, even though the system was drawn into the Arabian Sea. At least 140 people were killed, the effects of the storm in India, and another 21 people killed in the storm until then the region around the Pakistani Karachi by rain and probably associated with the foothills of the cyclone strong winds. The Pakistan Meteorological Department (PMD ) had warned on 22 June to heavy rain and wind gusts.

The JTWC stated in his Significant Tropical Weather Outlook for the northern Indian Ocean on June 24, found that a strong monsoonal flow to the surface air cyclonic activity of the system contributed and that the vertical wind shear is low and the water surface temperature were sufficient high. It warned. since ¤ could cause these factors to a rapid regenerate the system. Early on June 25, the JTWC issued to the wide time from a TCFA for this system. Shortly thereafter, both the RSMC and the JTWC took the regular warning to the system again.

As the depression moved to the north-west directly in front of the Pakistani coast, she reached wind speeds of around 48 km / h and the surface air pressure in Karachi was found around noon of June 25 with 990 mbar. According to the PMD, the center of the system pulled over in about 90 km distance to Karachi. As a result of favorable conditions and the presence of a deepening convection the system during the day again intensified into a deep depression. After further organizing it came at 03:00 UTC clock on the coast of Makran between Ormara and Pasni in Baluchistan in southwest Pakistan for the second landfall of the system. After reaching the mainland began a slow weakening of the system, and the JTWC issued late on June 26, his last warning.

The storm surprised two freighters, Al - Picaso and Lady Hamad, and four fishing boats, about 100 nautical miles from Karachi. The Pakistan Navy rescued 56 sailors from the two freighters and 36 fishermen from the fishing boats. The heavy rain of the storm caused. that there was flooding in the valley of Kech Korandi, of which the city Turbat was affected and therefore had to leave their houses about 10,000 people. At least 380 residents of the province of Baluchistan died from the effects of the storm, another 250 deaths caused the heavy rainfall in the province of Sindh and 100 in the North-West Frontier Province, and more rains that triggered the residual depth of the cyclone, complicated the rescue. At least ten districts in Balochistan and four districts in Sindh and thus at least 1.5 million inhabitants of the two provinces were affected by the effects of the storm. About 80 people were killed by floods and flash floods in Afghanistan, which had triggered the remnant low.

The PMD called the Deep depression in its warnings and analyzes as a tropical cyclone Yemyin what the next name was on the list of names of tropical cyclones at the time, although the RSMC New Delhi, the system not named in operations. In the reanalysis, the IMD Deep depression but classified on the Cyclonic Storm and gave him the name Yemyin later.

Deep Depression BOB 04

On 28 June, organized itself an area of ​​disturbed weather in the Gulf of Negalen, which was two days earlier emerged, increasingly better. The India Meteorological Department as the competent RSMC depicted the formation of a depression at 00:00 clock UTC ( 05:30 IST) south-east of Puri, Orissa fixed. Three hours later, the IMD classified the system to a "practically stationary " Deep Depression high. The Joint Typhoon Warning Center ( JTWC ) announced shortly afterwards from a Tropical Cyclone Formation Alert and noticed that observations on the east coast of the subcontinent had shown a decrease of atmospheric pressure, which corresponded with the state of development of the system. In addition, an anticyclone had formed in height above the fault that would hold doe wind shear within an environment favorable to the development of the system area. During the day the JTWC took on the issue of warnings, as the system moved northwestward direction n the coast of Orissa. The deep depression moved early on June 29 at Pun over the country. Because the system withdrew into the interior, presented the JTWC issuing warnings during the day one. Early on June 30, it was over Madhya Pradesh and Chhattisgarh, as the IMD abstufte the system to depression; released six hours later, the RSMC the last warning to BOB 04

The Pakistan Meteorological Department has already on 28 June for the first time warned that the residual depth of the system have potential to carry heavy rain and strong wind in the four provinces of Pakistan and feared a worsening of the situation in the already flooded as a result of cyclone Yemyin areas. In the announcement on 1 July, the PMD pointed to the high probability that the system would take place as originally thought to the northwest rather westward move to the south of the province of Sindh and regenerate over the Arabian Sea. The remnant low was also mentioned in early July 2 Significant Tropical Weather Advisory known given the JTWC. After crossing the Deccan Plateau, the convection was southwest of the center in the Arabian Sea, but several circulation centers were still above the Indian mainland, north - north-east of Mumbai. Finally, the circulation center was completely optional, and the JTWC did not go a few hours later from a development of the system.

Overlying the west of India, brought severe thunderstorms in conjunction with the rest of the system deep heavy rains caused by Maharashtra and in Mumbai and in the north east of Amravati Division Mumba by floods and strong wind disturbances in traffic. In Mumbai, 243 mm of precipitation were measured. At least 43 people were killed in the state, and 14 more died from the effects of the storm system in Gujarat. Up to 462 mm of precipitation fell in the district of Bharuch.

Deep Depression BOB 05

On July 1, the Naval Research Laboratory ( NRL) started the persecution of an evolving fault in the northern Bay of Bengal. After the formation of a low pressure area and a circulation center, explains the IMD, the system for depression and took on the issue of warnings; of the system at this time was about 150 km southeast of Kolkata in West Bengal. The system was during the day according to the JTWC Ainsicht already over land in south-western Bangladesh. But the next day the depression moved northwestward over the Ganges basin in West Bengal, the IMD classified the system on to a deep depression. Early on July 6, the westward migrating system was near Bankura.

When the system eventually decreased over the northern Chhattisgarh, it was downgraded to a depression on July 7 by the IMD. The IMD put the warnings after easing over Madhya Pradesh on July 8 no longer continue. Early the next day, reintensivierte the system at Shivpuri, in the northwest of the state, so that the IMD again recorded storm warnings, but during the day the IMD finally his last warning was made ​​final.

The depression led to heavy rainfall to Calcutta, where 16 people died. Within three days, fell about a rainfall, as they usually corresponds to 20 percent of the entire monsoon season.

Deep Depression BOB 06

On August 5, was the north-western Bay of Bengal, a low pressure area that organized, about 230 kilometers east of Balasore into a depression. The depression formed immediately after monsoonal floods had killed over 200 residents in the region. The system deepened slightly and was upgraded to Deep Depression, before moving towards the coast of Orissa. The system moved further west-north -west and reached north of Paradip at Cuttack early the next day over land ..

On August 7, the Pakistan Meteorological Department warned of a regeneration of the system in the Arabian Sea, after it had crossed Gujarat, but were not fulfilled these predictions.

Depression BOB 07

On September 21, a low pressure area 230 km south-southeast of Puri was declared a depression by RSMC New Delhi. The next day, the system came with wind speeds of 45 to 55 km / h with Puri on land without intensify significantly.

Depression BOB 08

Late on October 27, an area of ​​disturbed weather about 600 km east- southeast of Chennai was classified as Depression BOB 08 /2007. Early on October 29, the system degenerated into a low pressure area .. The system resulted in Chennau to heavy rains and strong winds, making a total of 15 residents were killed. < / Ref >.

Deep Depression ARB 02

On October 27, an area was classified with a weather disturbance about 885 nautical miles east of Cape Guardafui, Somalia by RSMC New Delhi as Depression ARB 02. The next day the Joint Typhoon Warning Center downgraded the depression as a tropical cyclone 05A. A short time later classified the RSMC the depression to a Deep Depression high. However, the system did not develop further and degenerated on November 2 in a low pressure area that moved further west.

Very Severe Cyclonic Storm Sidr

An area of ​​disturbed weather developed from 9 November near the Andaman Islands. They was increasingly organized better after she was passed by south to the islands, and finally the system was classified by the RSMC early on 11 November as Depression BOB 09. Zurselben time classified the Joint Typhoon Warning Center the system as Tropical Cyclone 06B. During the day, the system intensified into a deep depression that moved slowly northwestward. The IMD classified the system early on November 12 to a cyclonic storm Sidr high and missed the name. The hurricane began to rapidly intensify, pulling further to the northwest. Later that day, the IMD downgraded to a severe cyclonic storm Sidr and early the next day to a very high shear cyclonic storm.

After the storm had intensified zy a cyclone equivalent to category 4 on the Saffir -Simpson Hurricane Scale, were mobilized thousands of members of the civil defense in eastern India and Bangladesh. For low -lying areas along the coast mass evacuations were initiated, although shelters were available for only about 500,000 of the more than ten million people affected. The IMD dissolved on 14 November, Orissa and West Bengal cyclone alert. On the morning of November 15 cyclone Sidr reached with three-minute sustained winds of 215 km / h according to the data of the IMD and one-minute sustained winds of 260 km / h, according to the JTWC. its greatest intensity. Sidr officially arrived around 17:00 clock UTC that day about the country and reached there yet its peak wind speed. After landfall, the cyclone weakened rapidly and early on 16 November, the IMD issued its final warning to Cyclone Sidr made ​​. The name Sidr was proposed by Oman and is the Arabic word for a tree that belongs to the genus Ziziphus, Ziziphus spina- christi namely.

In the analysis after the season the JTWC Sidr classified a greater extent than in operations. Sidr was thus promoted to a Category 5 cyclone, and thus were the first time in the northern Indian Ocean during a season two cyclones have been observed in this strength.

Storm names

The names of tropical cyclones in the northern Indian Ocean are continuously and used once, so no names will be deleted especially worse storms. During the season, the following names have been used:

• Akash
• Gonu
• Yemyin
• Sidr