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Archive for Tropical Cyclones

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.

Ida Weakens to Tropical Storm and Turns Northward, Poised to Make Landfall on Gulf Coast

November 10th, 2009 Category: Tropical Cyclones

Tropical Storm Ida - November 9th, 2009

Tropical Storm Ida - November 9th, 2009

Track of Ida - November 9th, 2009 © Univ. of Wisconsin

Track of Ida

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As of 3:00 PM CST (2100 UTC), the center of Tropical Storm Ida was located near latitude 28.4 north, longitude 88.5 west, or about 60 miles (95 km) southeast of the mouth of the Mississippi River and about 165 miles (265 km) south-southwest of Pensacola, Florida.

Ida is moving toward the north near 18 mph (30 km/hr). A reduction in forward speed is expected over Monday night. On the forecast track, the center of Ida should reach the northern gulf coast Monday night. After landfall, Ida is expected to turn eastward on Tuesday.

Maximum sustained winds are near 70 mph (110 km/hr) with higher gusts. Weakening is expected Monday evening as Ida moves over cooler waters prior to making landfall and is expected to merge with a frontal zone on Wednesday.

Tropical storm force winds extend outward up to 200 miles (325 km) from the center. The latest minimum central pressure reported was 991 mb (29.26 inches).

A tropical storm warning remains in effect from Grand Isle, Louisiana eastward to the Aucilla River, Florida, including New Orleans and Lake Pontchartrain, meaning that tropical storm conditions are expected somewhere within the warning area within 24 hours.

Rains from Ida are already moving across the coast within the warning area. Total storm accumulations of 3 to 6 inches, with isolated maximum storm totals of 8 inches, are possible through Wednesday evening from the central and eastern Gulf coast across the southeastern United States into the southern mid-atlantic states.

A dangerous storm tide will raise water levels by as much as 3 to 5 feet above ground level along the coast near and to the east of where the center makes landfall, as well as in areas of onshore flow in southeastern Louisiana. Near the coast, the surge will be accompanied by large and destructive waves.