Enhanced Risk for Severe Thunderstorms Across the Upper Midwest; Flash Flooding Possible from the Upper Midwest to Southern Plains and Desert Southwest Through Friday

Portions of the Upper Midwest will see an increased threat for severe thunderstorms through this evening, with a few strong tornadoes possible. The same region remains on alert for additional flash flood concerns. Heavy rainfall may lead to flash flooding across the Desert Southwest today, and Southern Plains by Friday. Finally, Major-to-record river flooding continues across the Carolinas.
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Hazardous Weather Conditions

Last Update: 418 PM EDT Thu Sep 20 2018

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Miami - South Florida Local Forecast Office

36NM E South Palm Beach FL

Marine Zone Forecast


Synopsis: AMZ600-GMZ606-211200- Synopsis for Jupiter Inlet to Ocean Reef FL out to 60 nm and for East Cape Sable to Bonita Beach FL out to 60 nm- 418 PM EDT Thu Sep 20 2018 SYNOPSIS...Easterly winds will continue over South Florida waters this weekend leading to the typical nighttime and morning shower and thunderstorm activity, except afternoon and evening activity Lake Okeechobee waters and near-shore Gulf waters. A small northeast swell of 2 feet will also be working into the Atlantic waters of Palm Beach County this weekend from the north that is associated with the low north of Bermuda. .GULF STREAM HAZARDS...NONE The approximate location of the west wall of the Gulf Stream as of Sep 20, 2018 at 1200 UTC... 9 nautical miles northeast of Fowey Rocks. 19 nautical miles east southeast of Port Everglades. 9 nautical miles east southeast of Lake Worth. 12 nautical miles east southeast of Jupiter Inlet. This data courtesy of the Naval Oceanographic Office. $$

Tonight
East winds 5 to 10 knots along the coast to east around 10 knots in the gulf stream. Seas around 2 feet. Period 3 seconds. Intracoastal waters a light chop. A slight chance of showers and thunderstorms in the evening...then a chance of showers and thunderstorms after midnight.
Friday
East winds around 10 knots. Seas 2 to 3 feet. Period 4 seconds. Intracoastal waters a light chop. A chance of thunderstorms in the morning. A chance of showers through the day. A slight chance of thunderstorms in the afternoon.
Friday Night
East winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas to 5 feet. Period 8 seconds. Intracoastal waters light chop. A chance of showers and thunderstorms.
Saturday
East winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas to 5 feet. Period 8 seconds. Intracoastal waters light chop. A chance of showers and thunderstorms in the morning...then a slight chance of showers and thunderstorms in the afternoon.
Saturday Night
East winds 5 to 10 knots along the coast to east around 10 knots in the gulf stream. Seas 2 to 4 feet with occasional seas to 5 feet. Intracoastal waters a light chop. A chance of showers and thunderstorms.
Sunday
East winds 5 to 10 knots along the coast to east around 10 knots in the gulf stream. Seas 3 to 5 feet with occasional seas to 6 feet. Intracoastal waters a light chop. A slight chance of showers and thunderstorms.
Sunday Night
East winds 5 to 10 knots along the coast to east around 10 knots in the gulf stream. Seas 3 to 5 feet with occasional seas to 6 feet. Intracoastal waters a light chop. A slight chance of thunderstorms in the evening. A chance of showers through the night. A chance of thunderstorms after midnight.
Monday
East winds 5 to 10 knots along the coast to east around 10 knots in the gulf stream. Seas 2 to 4 feet with occasional seas to 5 feet. Intracoastal waters a light chop. A slight chance of showers and thunderstorms.
Monday Night
South southeast winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas to 5 feet. Intracoastal waters a light chop. A chance of showers and thunderstorms.
Tuesday
Southeast winds 5 to 10 knots along the coast to south southeast around 10 knots in the gulf stream. Seas 2 to 4 feet with occasional seas to 5 feet. Intracoastal waters a light chop. A slight chance of showers and thunderstorms.
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ABOUT THIS FORECAST

Last Update: 418 PM EDT Thu Sep 20 2018
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