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Posts tagged La Reunion

Tropical Cyclone Imelda (21S) Continues to Strengthen

11.6S 54.8E

April 11th, 2013 Category: Tropical Cyclones

Tropical Storm Twenty One (21S) – April 10th, 2013

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Track of Tropical Storm Twenty One (21S) - April 10th, 2013 © Univ. of Wisconsin

Track of TC 21S

Tropical Cyclone Imelda (TC 21S) has continued to strengthen, and satellite imagery indicates powerful convection throughout the storm.

On April 10 at 0900 UTC (5 a.m. EDT), Imelda’s maximum sustained winds were near 70 knots (80.5 mph/129.6 kph), making it a category one Cyclone. Imelda was centered near 12.1 south latitude and 58.2 east longitude, about 570 nautical miles north-northeast of La Reunion.

Imelda is moving to the west-southwest at 4 knots (4.6 mph/7.4 kph) and has slowed in forward movement. The cyclone is moving around the northwestern edge of a ridge (elongated area) of high pressure and is in an area of light wind shear. A trough of low pressure is expected to push Imelda to the southeast.

Tropical Cyclone Imelda (21S) North-Northeast of La Reunion

12.3S 59.0E

April 10th, 2013 Category: Tropical Cyclones

Tropical Storm Twenty One (21S) – April 9th, 2013

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Track of Tropical Storm Twenty One (21S) - April 8th, 2013 © Univ. of Wisconsin

Track of TC 21S

Tropical Cyclone Imelda (TC 21S), located approximately 650 nm north-northeast of La Reunion, has tracked west-southwestward at 13 knots over the past six hours. Maximum significant wave height is 22 feet.

The initial position is based on recent animated multispectral satellite imagery. The initial intensity is averaged from subjective Dvorak estimates from multiple reporting agencies. Animated infrared satellite imagery shows deepened convection over a low level circulation center that is beginning to form into an eye-like feature.

TC 21S lies slightly equatorward of an upper-level ridge axis, in an area of moderate (15-20 knot) easterly vertical wind shear (VWS); however, animated water vapor imagery shows excellent radial outflow.

Tropical Cyclone Imelda (21S) Tracking Westward

12.7S 59.0E

April 9th, 2013 Category: Tropical Storms

Tropical Storm Twenty One (21S) – April 8th, 2013

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Track of Tropical Storm Twenty One (21S) - April 8th, 2013 © Univ. of Wisconsin

Track of TC 21S

Tropical Cyclone Imelda (TC 21S), located approximately 755 nm northeast of La Reunion, has tracked westward at 09 knots over the past six hours. The current position is based on recent satellite fixes from PGTW and KNES and an SSMIS pass.

The current intensity of 45 knots is set slightly above a consensus of subjective Dvorak estimates from multiple reporting agencies based on structure evident in microwave imagery and higher automated intensity estimates. Recent animated infrared satellite imagery shows deep convection flaring over a low level circulation center (LLCC) evident in the aforementioned SSMIS pass.

TC 21S lies slightly equatorward of an upper-level ridge axis, in an area of moderate easterly vertical wind shear and radial outflow aloft. The system is tracking westward along the periphery of a subtropical ridge to the south.

Tropical Cyclone Felleng (13S) Tracking South-Southeastward

27.4S 51.3E

February 4th, 2013 Category: Tropical Cyclones

Tropical Cyclone Felleng (13S) – February 3rd, 2013

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Track of Tropical Cyclone Felleng (13S) - February 2nd, 2013 © Univ. of Wisconsin

Track of TC 13S

Tropical Cyclone Felleng (13S), located approximately 745 nm south of La Reunion has tracked south-southeastward at 15 knots over the past six hours.

Animated infrared satellite imagery shows all associated convection with the low level circulation center (LLCC) has been sheared to the southeast by approximately 175 nm. Older ASCAT passes indicate the LLCC has started to expand with the strongest winds located further from the center of the system.

The system has been located over sea surface temperatures (SST) between 23 to 24 degrees Celsius, directly impacting the warm central core. Felleng has begun the extra-tropical transition process and within the next 12 hours the SST values will drop below 20 degrees Celsius, accelerating the transition to a cold core system.

Tropical Cyclone Felleng (13S) East of Madagascar – February 2nd, 2013

21S 51.3E

February 2nd, 2013 Category: Image of the day, Tropical Cyclones

Tropical Cyclone Felleng (13S) – February 1st, 2013

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Track of Tropical Cyclone Felleng (13S) - February 1st, 2013 © Univ. of Wisconsin

Track of TC 13S

Tropical Cyclone Felleng (13S), located approximately 275 nm west-southwest of La Reunion, has tracked south-southeastward at 14 knots over the past six hours. Here, the system can be seen east of Madagascar. Maximum significant wave height at 31 feet.

The current position is based on recent position fixes from multiple reporting agencies and an SSMIS pass. The current intensity of 70 knots is consistent with a consensus of subjective Dvorak estimates and recent automated intensity estimates from CIMSS and CIRA.

Recent animated water vapor satellite imagery shows deep convection persisting over a tightly- wrapped low level circulation center (LLCC) and strong equatorward and eastward outflow driven by an upper-level ridge over the cyclone.