Severe Thunderstorms and Flash Flooding in the Central U.S.; A Dangerous Heatwave Coming to the West

A slow moving cold front will bring multiple rounds of widespread heavy rain, localized flash flooding, and severe thunderstorms from the central Plains into the Great Lakes through Saturday. A dangerous heatwave with record breaking and triple digit temperatures is expected this weekend into next week over the Northwest U.S. Excessive Heat Watches and Warnings have been issued.
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Hazardous Weather Conditions

Last Update: 402 AM EDT Fri Jun 25 2021

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Miami - South Florida Local Forecast Office

9NM E South Palm Beach FL

Marine Zone Forecast


...SMALL CRAFT SHOULD EXERCISE CAUTION...
Synopsis: Scattered to numerous showers and thunderstorms expected for the upcoming weekend. Locally hazardous conditions are likely in and near thunderstorms with potential periods of gusty winds, rough seas, and isolated waterspouts. Wind gusts may approach Small Craft Advisory criteria across the Gulf and Atlantic waters.

.GULF STREAM HAZARDS... Locally elevated seas and gusty winds in and near the strongest showers and thunderstorms.

The approximate location of the west wall of the Gulf Stream as of Jun 24, 2021 at 1200 UTC...

11 nautical miles east northeast of Fowey Rocks. 13 nautical miles east northeast of Port Everglades. 6 nautical miles east southeast of Lake Worth. 11 nautical miles east southeast of Jupiter Inlet.

This data courtesy of the Naval Oceanographic Office.

Today
East winds 10 to 15 knots with gusts to around 20 knots. Seas 2 to 4 feet with occasional seas to 5 feet. Period 6 seconds. Intracoastal waters a moderate chop. Chance of showers and thunderstorms.
Tonight
East winds around 15 knots with gusts to around 20 knots. Seas 2 to 4 feet with occasional seas to 5 feet. Period 7 seconds. Intracoastal waters a moderate chop. Chance of showers and thunderstorms.
Saturday
East winds around 15 knots with gusts to around 20 knots. Seas 2 to 4 feet with occasional seas to 5 feet. Period 7 seconds. Intracoastal waters a moderate chop. Chance of thunderstorms in the morning. Showers likely. Thunderstorms likely in the afternoon.
Saturday Night
East winds around 15 knots with gusts to around 20 knots. Seas 2 to 4 feet with occasional seas to 5 feet. Period 5 seconds. Intracoastal waters a moderate chop. Chance of thunderstorms in the evening. Chance of showers through the night. Slight chance of thunderstorms after midnight.
Sunday
East winds 10 to 15 knots with gusts to around 20 knots. Seas 2 to 3 feet. Intracoastal waters a moderate chop. Showers likely and chance of thunderstorms.
Sunday Night
East winds 10 to 15 knots. Seas 2 to 3 feet. Intracoastal waters a moderate chop. Chance of showers and slight chance of thunderstorms.
Monday
East southeast winds 10 to 15 knots. Seas 2 to 3 feet. Intracoastal waters a moderate chop. Chance of showers and slight chance of thunderstorms in the morning, then showers likely and chance of thunderstorms in the afternoon.
Monday Night
East southeast winds around 10 knots along the coast to east southeast 10 to 15 knots in the gulf stream. Seas 2 to 3 feet. Intracoastal waters a moderate chop. Chance of showers and slight chance of thunderstorms in the evening, then showers likely and chance of thunderstorms after midnight.
Tuesday
East southeast winds around 10 knots. Seas 2 to 3 feet. Intracoastal waters a light chop. Showers in the morning. Chance of thunderstorms. Showers likely in the afternoon.
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ABOUT THIS FORECAST

Last Update: 402 AM EDT Fri Jun 25 2021
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