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Tropical Storm 03B Near Coasts of Bangladesh and India – November 18th, 2012

20.1N 86.7E

November 18th, 2012 Category: Image of the day, Tropical Storms

Tropical Storm Three (03B) – November 18th, 2012

Track of Tropical Storm Three (03B) - November 18th, 2012 © Univ. of Wisconsin

Track of TS 17E

A area of low pressure formed in the Bay of Bengal on 12 November. It gradually drifted northwestwards and organized itself until November 17, when the JTWC issued a TCFA on the system, reporting 30 knot winds at the center. About half an hour following the TCFA, the IMD upgraded the area of low pressure into a Depression, and further into a Deep Depression, the same evening.

Tropical Depression 03B developed a well-defined LLCC with increasing deep convection located to the north of the system. In an environment with moderate vertical wind shear and ample sea surface temperatures, the depression deepened further. The same night, the JTWC initiated advisories on the system, classifying it as a tropical storm with one minute sustained winds of 35 knots.

As of 1:00 PM IST (7:30 AM UTC), 18 November 2012, Tropical Storm 03B was located near latitude 16.0°N and longitude 88.0°E, about 900 km east-northeast of Chennai, 550 km east-southeast of Visakhapatnam and 500 km southeast of Paradip. The system is forecast to intensify further into a Cyclonic Storm and move westwards during the next 12 hours, and then west-southwestwards towards the coasts of south Andhra Pradesh and north Tamil Nadu in the subsequent 72 hours. The Dvorak intensity of the storm is T2.0

Tropical Cyclone 03B (Three)

October 21st, 2008 Category: Tropical Cyclones

October 21st, 2008 - Tropical Cyclone 03B03B

October 21st, 2008 - Tropical Cyclone 03B

Tropical Cyclone 03B - 4 day sequence

Tropical Cyclone 03B - 4 day sequence

Tropical Cyclone 03B located approximately 165 nm east of Cape Guardafui, Somalia has tracked north-northwestward at 05 knots over the past six hours. The current position represents a departure from the previously forecast track, and is based upon animated multi-spectral imagery which depicts an elongated and partially-exposed, low level circulation center (LLCC).

This change in storm motion over the past six hours is due to the enhanced low-level cross equatorial gradient flow south of the system which is providing a weak poleward steering influence on the sytorm. Convection continues to wane over the LLCC under the effects of increased vertical shear with the majority of activity confined to the southwestern quadrant of the storm in an area of enhanced low-level convergence. Current intensity is based on Dvorak estimates of 25 to 35 knots, multiple nearby surface observations and scatterometry data depicting 30 to 35 knot unflagged winds near the center. While outflow remains fair, vertical wind shear continues to degrade the upper level exhaust mechanism.

Tropical Cyclone 03B - enhanced image

Tropical Cyclone 03B - enhanced image

Tropical Cyclone 03B is expected to maintain 35-knot strength through tau 12 and then will begin gradually weakening due to moderate vertical shear and land interaction while approaching the somali coast under the steering influence of the low-level sub-tropical ridge north of the system.

Near tau 36, the storm will move over the Gulf of Aden where it is expected to continue weakening as it encounters lower ocean heat content values, increased vertical wind shear and the intrusion of drier air from the north. Tropical Cyclone 03B is expected to dissipate over land near tau 72 along the coast of Yemen.

source JTWC