Is the Wait-and-See Game With 99L Ending? Also, Tornadoes Rip Indiana and Ohio

By: Jeff Masters and Bob Henson, 3:27 PM GMT on August 25, 2016

A high-stakes game of wait-and-see is underway with a large but disorganized tropical wave (Invest 99L) centered near the southeastern Bahama Islands on Thursday morning. The storm brought heavy rains of 3 - 5” over the past 24 hours to portions of the Dominican Republic and Puerto Rico, and was generating winds near tropical storm force in the waters to the north of Hispaniola. 99L could become a tropical depression or tropical storm at any time over the next thr...

Hurricane Tornado

Updated: 7:30 PM GMT on August 25, 2016

Huge 99L Generating 55 mph Winds, But Remains Disorganized

By: Jeff Masters, 10:13 PM GMT on August 24, 2016

A huge and powerful tropical wave (Invest 99L) is generating winds of tropical storm force near the Virgin Islands, and could become a tropical storm at any time over the next two days as it heads west-northwest at 15 mph towards The Bahamas. If 99L develops a well-defined surface circulation, it will be called Tropical Storm Hermine. An Air Force hurricane hunter aircraft was investigating 99L early Wednesday afternoon and found sustained surface winds of 50 - 55 m...

Hurricane

Updated: 10:35 PM GMT on August 24, 2016

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

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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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