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Convection of Tropical Storm Mahasen (01B)

12.3N 82.9E

May 13th, 2013 Category: Tropical Storms

Tropical Storm Mahasen (01B) – May 10th, 2013

Enhanced image

Track of Tropical Storm Mahasen  (01B) - May 11th, 2013 © Univ. of Wisconsin

Track of TC 01B

An SSMIS 37ghz microwave image shows convection remains fragmented and broken while the Low Level Circulation Center (LLCC) of Tropical Storm Mahasen (01B) remains fairly ambiguous.

Surface observations from coastal India show large (>20 degrees) dew point temperature spreads indicative of a dry air mass while the latest microwave derived total precipitable water loop continues to show this dry continental air is being ingested into the lower levels of the system. This dry air ingestion continues to be the reason for the fragmented and flaring nature of the convection despite favorable sea surface temperatures.

The initial position is based upon the MSI loop and aforementioned SSMIS microwave image with low confidence due to the poor definition and broad nature of the LLCC. The initial intensity remains at 45 knots based on a Dvorak current intensity estimate of 45 knots from PGTW and the overall organization of the system. Upper-level analysis reveals a marginal environment of strong diffluence aloft providing favorable outflow while vertical wind shear (VWS) has increased to moderate to strong levels (20-30 knots).

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

12.5N 90.0E

May 12th, 2013 Category: Image of the day, Tropical Storms

Tropical Storm Mahasen (01B) – May 11th, 2013

Enhanced image

Track of Tropical Storm Mahasen  (01B) - May 11th, 2013 © Univ. of Wisconsin

Track of TC 01B

Tropical Storm Mahasen (01B), located approximately 750 nm south of Kolkata, India, has tracked northwestward at 04 knots over the past six hours. Maximum significant wave height is 19 feet.

Animated multispectral satellite imagery (MSI) reveals pulsating deep central convection with fragmented convective banding wrapping into a poorly defined and broad low-level circulation center (LLCC).

Tropical Storm Mahasen (01B) Forecast to Maintain Intensity

12.7N 86.3E

May 12th, 2013 Category: Tropical Storms

Tropical Storm Mahasen (01B) – May 10th, 2013

Enhanced image

Track of Tropical Storm Mahasen  (01B) - May 11th, 2013 © Univ. of Wisconsin

Track of TC 01B

Tropical Storm Mahasen (01B) is locatedabout 600 km west-southwest of Car Nicobar, 700 km northeast of Trincomalee, 850 km southeast of Chennai and 1450 km south-southwest of Chittagong.

The storm is forecast to maintain intensity in the next 24 hours, and move northwestwards during the next 36 hours, recurving thereafter northeast towards the coasts of Bangladesh and Myanmar. Sustained maximum surface wind speed is estimated at 75 km/h (45 mph), gusting to 95 km/h (60 mph). Estimated minimum central pressure is at 996 hPa.

Tropical Storm Mahasen (01B) in Indian Ocean

14.3N 87.1E

May 12th, 2013 Category: Tropical Storms

Tropical Storm Mahasen (01B) – May 10th, 2013

Enhanced image

Track of Tropical Storm Mahasen  (01B) - May 11th, 2013 © Univ. of Wisconsin

Track of TC 01B

An area of convection in the Indian Ocean strengthened into Tropical Storm Mahasen (01B) on May 11th.

Multispectral satellite imagery suggested that there was a large area of multiple rainbands leading into a low-level circulation center (LLCC), obscured by deep central convection. Also, low vertical wind shear (VWS) made the weather conditions favorable for tropical cyclogenesis. On 12 May, the IMD reported that Mahasen was weakening as satellite imageries showed the disorganization of the cloud system around the storm.

Area of Convection in Indian Ocean Upgraded to Tropical Storm

14.3N 87.8E

May 11th, 2013 Category: Tropical Storms

Tropical Storm Mahasen (01B) – May 10th, 2013

Enhanced image

Track of Tropical Storm Mahasen  (01B) - May 11th, 2013 © Univ. of Wisconsin

Track of TC 01B

An area of convection first appeared on 4 May. It slowly tracked eastwards and organized itself into a low pressure area on 8 May.

The Joint Typhoon Warning Center (JTWC) later issued a Tropical Cyclone Formation Alert (TCFA) on 10 May as the system became more organized, followed by he India Meteorological Department (IMD) upgrading it to a well-marked low pressure area. Later the same day, JTWC issued the first warning for the storm, designating it 01B, followed by the IMD upgrading the storm into a depression, and subsequently into a deep depression. In the early hours of 11 May, IMD upgraded the storm to Cyclonic Storm status, naming it Mahasen (01B).

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