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Posts tagged 13L

Tropical Storm Lee Dissipating Over Southern USA

31.3N 93.7W

September 5th, 2011 Category: Tropical Storms

Tropical Storm Lee (13L) - September 4th, 2011

Track of TS 13L  - September 4th, 2011 © Univ. of Wisconsin

Track of TS 13L

In late August, a tropical wave producing scattered showers and thunderstorms entered the Western Caribbean. Moving generally west-northwestward, the wave began to organize in the southeastern portion of the Gulf of Mexico.

During the afternoon hours of September 1, the hurricane hunters went out to investigate the well-defined wave, and found a closed low-level circulation. Thus, advisories were initiated on Tropical Depression Thirteen.

Moving northwest, the tropical depression was upgraded to a tropical storm, given the name “Lee” on September 2. Continuing to organize, Lee reached a peak intensity of 60 mph early on September 3, while located just south of Louisiana.

At 4AM CDT September 4, Lee made landfall roughly 50 miles to the southwest of Lafayette, Louisiana with maximum sustained winds of 45 mph. Further weakening occurred as Lee moved across Louisiana, and the last NHC advisory on Lee was issued early on September 5. Here, the storm can be seen on the right side of the main image, moving over Louisiana.

Tropical Storm Lee Drifting Northwards Over Louisiana, USA – September 3rd, 2011

27.0N 91.8W

September 3rd, 2011 Category: Image of the day, Tropical Storms

Tropical Storm Lee (13L) - September 3rd, 2011

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Track of TS 13L  - September 3rd, 2011 © Univ. of Wisconsin

Track of TS 13L

The center of Tropical Storm Lee is located near 29.4 north, longitude 92.1 west. Lee is drifting erratically toward the north near 4 mph (6 km/h).

A slow and possibly erratic motion toward the north or north-northwest is expected during the next 24 hours, followed by a turn toward the northeast.

On the forecast track, the center of Lee is expected to cross the Louisiana coast later this afternoon or evening, then move slowly across southern Louisiana on Sunday.

Maximum sustained winds remain near 60 mph (95 km/h) with higher gusts. Some fluctuations in strength are possible this afternoon and tonight, with gradual weakening forecast to occur by Sunday afternoon.

Tropical-storm-force winds extend outward up to 230 miles (370 km) from the center. An offshore oil rig south of Sabine pass recently reported a sustained wind of 50 mph (81 km/h) and a gust to 60 mph (90 km/h) at an elevation of 230 feet above the surface.Reports from offshore oil rigs and Louisiana State University coastal observing sites indicate the minimum central pressure is 989 mb (29.21 inches).

The tropical storm watch has been replaced with a tropical storm warning from the Alabama/Florida border eastward to Destin, Florida. A tropical storm warning is also in effect from Destin, Florida westward to Sabine Pass, Texas, including the city of New Orleans, Lake Pontchartrain and Lake Maurepas.

Hazards affecting land include rainfall, stormsurge, wind and tornadoes. Tropical Storm Lee is expected to produce total rain accumulations of 10 to 15 inches from the central gulf coast northward into the Tennessee Valley, with possible isolated maximum amounts of 20 inches through Sunday. These rains are expected to cause extensive flooding and flash flooding. A storm surge will raise water levels by as much as 3 to 5 feet above ground level along the Louisiana coast, and by as much as 1 to 3 feet above ground level along the Mississippi and Alabama coasts including Mobile Bay.

With regards to wind, tropical storm conditions are expected to continue over portions of the warning area tonight into Sunday, and possibly into Monday.A few tornadoes will be possible through tonight over portions of southern Louisiana, southern Mississippi, southern Alabama and the far western Florida Panhandle.

Hurricane Karl Heading for Mexico Coast With 100mph Winds – September 17th, 2010

20.7N 92.5W

September 17th, 2010 Category: Image of the day, Tropical Cyclones

Hurricane Karl (13L) - September 16th, 2010

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Track of TS 13L - September 16th, 2010 © Univ. of Wisconsin

Track of TS 13L

As of 10 p.m. CDT September 16 (0300 UTC September 17), Tropical Storm Karl (13L) is located within 15 nautical miles of 19.7°N 94.5°W, about 115 mi (185 km) east-northeast of Veracruz, Mexico and about 210 mi (335 km) east-southeast of Tuxpan, Mexico.

Maximum sustained winds are 85 knots (100 mph, 160 km/h), with stronger gusts. Minimum central pressure is 968 mbar (hPa; 28.58 InHg), and the system is moving west at 8 kt (9 mph, 15 km/h).

Hurricane force winds extend up to 15 miles (25 km) from the center of Karl, and tropical storm force winds up to 105 miles (165 km) from the center.

Area of Low Pressure Becomes Tropical Storm Karl (13L) by Yucatan Peninsula

20.4N 86.6W

September 15th, 2010 Category: Tropical Storms

Tropical Storm Karl (13L) - September 14th, 2010

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Track of TS 13L - September 14th, 2010 © Univ. of Wisconsin

Track of TS 13L

The area of low pressure over the Caribbean Sea was declared Tropical Storm Karl while at a distance of 315 miles east of the Yucatán Peninsula.

As of 11 p.m. EDT September 14 (0300 UTC September 15), the center of Tropical Storm Karl was located within 15 nautical miles of 18.6°N 85.5°W, about 185 miles (295 km) east of Chetumal, Mexico.

Maximum sustained winds are estimated to be 45 mph (75 km/h), with stronger gusts. Minimum central pressure is estimated at 999 mbar (hPa; 29.50 InHg), and the system is moving west-northwest at 15 mph (24 km/h). Tropical storm force winds extend up to 25 miles (40 km) from the center of Karl.

Low Pressure System in Caribbean Sea Situated by Hispaniola

18.1N 69.8W

September 13th, 2010 Category: Tropical Storms

Low Pressure System Near Hispaniola - September 12th, 2010

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Track of Low Pressure System - September 12th, 2010 © Univ. of Wisconsin

Track of Low Pressure System

Aircraft data from NOAA and NASA research missions within the area of disturbed weather over the central Caribbean Sea suggest that the system may not have a well-defined center of circulation.

However, the disturbance is still producing a large and disorganized area of showers and thunderstorms which could cause locally heavy rainfall in portions of Puerto Rico, Hispaniola, Jamaica and Cuba during the next day or two. These rains could cause life-threatening flash floods and mud slides, especially in mountainous terrain.

There is a medium chance (40 percent) that this system could become a tropical cyclone during the next 48 hours as it moves west-northwestward at 10 to 15 mph toward the northwestern Caribbean Sea.