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Archive for Tropical Cyclones

Typhoon Nida (26W) Moves Slightly Northwestward

23.6N 134.2E

December 2nd, 2009 Category: Tropical Cyclones

Typhoon Nida (26W) - December 1st, 2009

Typhoon Nida (26W) - December 1st, 2009

Track of TY 26W - December 1st, 2009 © Univ. of Wisconsin

Track of TY 26W

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Typhoon Nida (TY 26W), located approximately 315 nautical miles southwest of Iwo To, has tracked north-northwestward at 7 knots over the last six hours. A finger of the mid-level subtropical ridge located to the east has continued to steer the system westward. Maximum significant wave height is 26 feet.

Animated infrared satellite imagery shows weakening convection with an embedded center while animated water vapor imagery and an SSMIS micrwoave image indicate the deep convection has shifted somewhat to the east of the low level circulation center (LLCC), suggesting the system has moved into an environment of moderate vertical wind shear. Accordingly, Dvorak estimates have dropped to 55-65 knots.

Nida is still expected to continue tracking generally northwestward before recurving ahead of a quickly approaching mid-latitude trough currently digging north of China. Over the next two days the system will continue to weaken due to increasing vertical wind shear and dry air entrainment. By TAU 48 Nida will complete transition into a very weak extratropical cyclone and its energy will continue tracking northeastward into the mid-latitudes.

Typhoon Nida (26W) Still Churning South-Southwest of Iwo To

21.7N 129.3E

December 1st, 2009 Category: Tropical Cyclones

Typhoon Nida (26W) - November 28th, 2009

Typhoon Nida (26W) - November 30th, 2009

Track of TY 26W - November 30th, 2009 © Univ. of Wisconsin

Track of TY 26W

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Typhoon Nida (TY 26w), located approximately 325 nautical miles south-southwest of Iwo To, has tracked northwestward at 4 knots over the past six hours. Maximum significant wave height is 34 feet.

The system has maximum sustained winds  of 90 knots, with higher gusts of up to 110 knots. Sixty-four knot winds extend outward for a 50 nautical mile radius from the center of Nida. The radius of 50 knot winds is between 90 and 95 nautical miles, and 34 knot winds reach a 150 nautical miles radius.

Nida (26W) Becomes Category 5 Super Typhoon – November 29th, 2009

20.4N 137.8E

November 29th, 2009 Category: Image of the day, Tropical Cyclones

Typhoon Nida (26W) - November 28th, 2009

Typhoon Nida (26W) - November 28th, 2009

Track of STY 26W - November 28th, 2009 © Univ. of Wisconsin

Track of STY 26W

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Super Typhoon Nida (STY 26w), located approximately 350 nautical miles south-southwest of Iwo To, has tracked north-northeastward at 2 knots over the past six hours. Maximum significant wave height is 34 feet.

Maximum sustained winds are at 140 knots, with stronger gusts of up to 170 knots. Winds of 64 knots extend outward for a radius of 50 to 55 nautical miles from the eye of the storm, while the radius of winds of up to 50 knots is 75 to 80 nautical miles.

Category One Typhoon Nida (26W) in Western Pacific – November 25th, 2009

14.4N 139.2E

November 25th, 2009 Category: Image of the day, Tropical Cyclones

Typhoon Nida (26W) - November 25th, 2009

Typhoon Nida (26W) - November 25th, 2009

Track of TY 26W - November 25th, 2009 © Univ. of Wisconsin

Track of TY 26W

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Typhoon Nida (26W), located approximately 170 nautical miles south-southwest of Guam, has tracked north-northwestward at 10 knots over the past six hours. Maximum significant wave height at is 21 feet. Nida has maximum sustained winds near 64 knots (74 mph or 119 km/hr), making it a Category One typhoon.

NASA and JAXA report that Typhoon Nida is lashing Yap State in the Western Pacific. Most of the rainfall from Nida has been between 20 and 40 millimeters (.78 to 1.57 inches) per hour, with areas near the system’s center falling at as much as 2 inches of rain per hour (considered heavy rainfall). Nida is forecast to move in a northwesterly direction and continue to strengthen over the next several days.

A typhoon warning is in effect for Faraulep, a small atoll in the western Caroline Islands, located within Yap State, in the Federated States of Micronesia. This type of warning means that typhoon conditions of sustained winds of 64 knots or higher associated with the typhoon are expected in the specified coastal area within the next 24 hours.

A tropical storm watch is also in effect in the Western Pacific Islands for Ulithi, an atoll in the Caroline Islands, located about 103 nautical miles east of Yap, and for Fais, one of the outer islands of the State of Yap. That means tropical storm conditions can be expected in the next 36 hours.

Tropical Cyclone Anja (01S) East-Northeast of La Reunion

16.1S 66.0E

November 17th, 2009 Category: Tropical Cyclones

Tropical Cyclone Anja - November 16th, 2009

Tropical Cyclone Anja - November 16th, 2009

Track of TC 01S - November 10th, 2009 © Univ. of Wisconsin

Track of TC 01S

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Tropical Cyclone Anja (01S), located approximately 715 nm east-northeast of La Reunion, has tracked south-southwestward at 11 knots over the past six hours. Maximum significant wave height is 26 feet.

Animated infrared imagery shows Anja has maintained a small (just over 60 nm in diameter) but compact symmetry with annular characteristics.

The cyclone is being steered along the western boundary of a deep-layered subtropical ridge to the east. Upper level analysis indicates the system is directly under the ridge axis in a zone of low vertical wind shear. Animated water vapor imagery shows good radial outflow overhead.

TC 01S is expected to maintain its current intensity over the next 12 hours as it crests the western edge of the steering ridge. After TAU 12, it will begin to track over colder water and shift to a more southeastward track. This transition is in response to the approach of a mid latitude trough from the southwest.

At this stage, Anja will also begin to rapidly weaken and accelerate southeastward as it gets exposed to the strong westerly vertical wind shear. This will coincide with the cyclone’s transition into an extra tropical (ET) system with full ET status by TAU 72. The available numeric guidance is in close agreement with this track forecast with the sole exception of GFS that is significantly right of the envelope from TAU 12.