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Tropical Storm Mahasen (01B) South-southwest of Kolkata, India – May 14th, 2013

13.0N 81.9E

May 14th, 2013 Category: Tropical Storms

Tropical Storm Mahasen (01B) – May 12th, 2013

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Track of Tropical Storm Mahasen  (01B) - May 14th, 2013 © Univ. of Wisconsin

Track of TC 01B

Tropical Storm Mahasen (01B), located approximately 484 nm south-southwestward of Kolkata, india, has tracked northeastward at 07 knots over the past six hours. Maximum significant wave height is 21 feet.

Animated multispectral satellite imagery shows deep convection has recently built back over the low level circulation center (LLCC) within the past few hours from the convergent bands along the western periphery. The current intensity has remained steady at 45 knots over the past six hours based on a recent OSCAT pass indicating central winds between 40 to 45 knots and Dvorak estimates from KNES and PGTW supporting 45 knots.

Kolkata by Hooghly River, India

22.5N 88.3E

October 12th, 2011 Category: Rivers

Bangladesh and India - October 6th, 2011

Kolkata, formerly known as Calcutta, is the capital of the Indian state of West Bengal. Kolkata was the commercial capital of East India, located on the east bank of the Hooghly River. Here, it appears as a bright white area near various rivermouths along the shores of the Bay of Bengal, stretching from India into Bangladesh.

The city of Kolkata has 4.5 million residents, and the metropolitan area, including suburbs, has a population of approximately 15.7 million, making it the third most populous metropolitan area in India and the 13th most populous urban area in the world. The city is also classified as the eighth largest urban agglomeration in the world.

Area of Low Pressure South-Southeast of Kolkata, India

21.4N 89.3E

October 13th, 2010 Category: Tropical Storms

Area of Low Pressure by India - October 12th, 2010

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Track of Low Pressure Area

The area of convection previously located near 17.8N 89.5E is now located near 18.2N 89.6E, approximately 265 nm south-southeast of Kolkata, India.

Animated infrared satellite imagery shows flaring deep convection associated with a developing broad low level circulation center (LLCC). Additionally, a TRMM microwave image indicates elongated low level banding.

A buoy observation located in the southern convective band indicates 1002 mb surface pressure. The LLCC is located equatorward of the subtropical ridge axis in an area of upper level divergence and moderate vertical wind shear.

Maximum sustained surface winds are estimated at 20 to 25 knots. Minimum sea level pressure is estimated to be near 1005 mb. The potential for the development of a significant tropical cyclone within the next 24 hours has been upgraded to fair.

Area of Low Pressure Makes Landfall Over Paradip and Kolkata, India

21.5N 87.6E

October 9th, 2010 Category: Tropical Storms

Area of Low Pressure by India - October 8th, 2010

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Track of Low Pressure Area - October 8th, 2010 © Univ. of Wisconsin

Track of Low Pressure Area

On October 7, the India Meteorological Department (IMD) upgraded an area of low pressure to a depression, giving it the designation “BOB 02″. At that time, the depression was located approximately 180 km (110 miles) southeast of Visakhapatnam.

Later that day, the IMD reported that the system was 120 kilometres (75 mi) east of Visakhapatnam. On the same day, the IMD reported that the system moved away from Visakhapatnam and maintained strength. The system was forecast to make landfall between Gopalpur and Paradip overnight, but instead, the depression made landfall over Paradip late on October 7.

On October 8, the IMD reported that the system weakened slightly. Later on that day, the IMD reported that the depression further weakened. The storm made its second landfall at Kolkata,West Bengal, India. Signal 3 cyclone alert was issued at the Maritime ports of Chittagong, Cox’s Bazar and Mongla. The Depression continued to weaken, as it moved northwest, until it was caught up in the jet stream and completely absorbed by a non-tropical storm, late on October 8.

Tropical Cyclone 02B (Aila) Makes Landfall, Causing Floods and Tidal Waves

22.5N 88.3E

May 26th, 2009 Category: Tropical Cyclones

Tropical Cyclone 02B (Aila) - May 26th, 2009

Tropical Cyclone 02B (Aila) - May 26th, 2009

TC 02B color composite © IMD

TC 02B color composite

Tropical Cyclone 02B (Aila), over Sub-Himalayan West Bengal and adjoining parts of Bangladesh, has moved further northward and weakened into a deep depression.

The cyclone made landfall yesterday, slamming into the coastal areas of eastern India and Bangladesh with 110 kph winds, killing at least 17 people and leaving thousands homeless.

Aila, which is currently located approximately 105 nautical miles north of Kolkata (Calcutta), India, has tracked northward at 13 knots over the past six hours.

The system still has a defined low level circulation center with a defined convective band wrapping around the northern periphery into the center.

TC 02B has been moving into an increasingly hostile environment with moderate vertical wind shear and interaction from land during the last 6 hours.

As of this morning it lay centred over Sub-Himalayan West Bengal, about 50 km to the north of Malda. The system is likely to move in a near northerly direction, and continue to gradually lose strength overland as it moves into an increasingly dry environment. It is forecast to weaken into a depression during next six hours.

Under its influence, rainfall at most places is heavy, with some isolated extremely heavy falls greater than 25cm likely over Sub-Himalayan West Bengal and Sikkim, and Assam and Meghalaya for the next 24 hours. In these areas, squall-like wind speeds reaching 50-60kph are also expected during the next 12 hours.

Rain and thundershowers are also likely at many places with isolated heavy falls over Arunachal Pradesh and Nagaland, Manipur, and Mizoram and Tripura during the next 24 hours.

After Aila made landfall, mud embankments in West Bengal burst as heavy rains swelled the rivers, reports CBC news. In Kolkata, West Bengal’s state capital, trees were uprooted and communication lines were brought down. At least 10 people died in West Bengal because of collapsed buildings and fallen trees.

Meanwhile, the storm triggered tidal waves in the Bay of Bengal that slammed into low-lying coastal Bangladesh, damaging thousands of houses, and killing at least seven people.

Thousands of people were evacuated from the Khulna district ahead of the storm but about 15,000 people are believed to still be stranded in eight flooded villages.