99L Poised to Become Tropical Storm Hermine

By: Bob Henson and Jeff Masters, 3:57 PM GMT on August 24, 2016

Invest 99L is already bringing winds of tropical storm force to the northern Lesser Antilles Islands, and it could become a tropical storm at any time over the next day as it heads west-northwest at 15 mph towards Puerto Rico and the Virgin Islands. At Barbuda, sustained winds at minimal tropical storm-force—39 mph—were observed at 7:18 am AST, with a wind gust of 45 mph. At 10 am AST, Princess Juliana Airport in St. Maartin recorded sustained winds (below tropi...

Hurricane

Unwelcome Rains Will Put Stress on Lake Okeechobee’s Dike

By: Jeff Masters, 11:32 AM GMT on August 24, 2016

A steadily organizing Invest 99L was bringing heavy rains and strong wind gusts to the northern Lesser Antilles on Wednesday morning, and is an increasing threat to develop into a tropical storm. Even if 99L never develops into a tropical cyclone, it has the potential to dump a large amount of rain on a place that doesn’t need it—the catchment basin of Lake Okeechobee in Central Florida. The huge lake represents an important source of fresh water to South Florid...

Hurricane

Updated: 12:51 PM GMT on August 24, 2016

Still-Disorganized 99L Remains a Threat to Southeast U.S. Coast; Gaston Growing

By: Bob Henson, 9:54 PM GMT on August 23, 2016

A large and strong tropical wave about 250 miles east of the Lesser Antilles, Invest 99L, continues to move west-northwest at about 20 mph on a course that would bring it within striking distance of the southeast U.S. coast by late in the weekend or early next week, quite possibly at hurricane strength. Venturing into 99L on Tuesday, Air Force Hurricane Hunters found that the wave had an poorly defined circulation, elongated from north to south. Often it will take o...

Hurricane

Updated: 11:51 PM GMT on August 23, 2016

Threat to Southeast U.S. Growing From 99L; Gaston Forms in Eastern Atlantic

By: Jeff Masters, 3:40 PM GMT on August 23, 2016

The Hurricane Hunters are in the air, investigating Invest 99L, a steadily organizing tropical wave that was located about 300 miles east of the northern Lesser Antilles late Tuesday morning. This storm will bring heavy rains and gusty winds to the northern Lesser Antilles Islands Tuesday evening through Wednesday, and is likely to develop into a tropical storm or hurricane that will affect the Bahamas and the Southeast U.S. coast late this week or early next week. ...

Updated: 3:42 PM GMT on August 23, 2016

99L a Potential Threat to Hispaniola, Bahamas, U.S. East Coast

By: Jeff Masters and Bob Henson, 4:38 PM GMT on August 22, 2016

The main Atlantic tropical weather threat to populated areas continues to be Invest 99L, a large tropical wave with an increasing amount of heavy thunderstorm activity that was located about 800 miles east of the northern Lesser Antilles Islands late Monday morning. This disturbance was moving west to west-northwest at 15 - 20 mph, and will bring heavy rains and gusty winds to these islands beginning on Tuesday evening. Conditions for development will steadily impro...

Hurricane Extreme Weather

Updated: 5:19 PM GMT on August 22, 2016

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Dr. Masters co-founded wunderground in 1995. He flew with the NOAA Hurricane Hunters 1986-1990. Co-blogging with him: Bob Henson, @bhensonweather

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