Dangerous Heat Building in the West; Severe Storms in the Upper Midwest

A long duration heat wave will build across the Southwest, California, and Pacific Northwest. Dangerous heat is also forecast for the Great Basin and South Plains. Severe storms in the Upper Midwest may have locally heavy rain, damaging winds, and very large hail. Heavy rain and flooding will also be possible in the Deep South and Appalachians.
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Hazardous Weather Conditions

Last Update: 839 PM AST Thu Aug 13 2020

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San Juan, PR Local Forecast Office

41NM N San Juan PR

Marine Zone Forecast


Synopsis: Moderate to fresh trade winds will persist across the regional waters through the end of the work-week, resulting in choppy seas. Tropical Storm Josephine is still forecast to track north of the region during the weekend. This could result in some hazardous marine conditions, mainly across the offshore Atlantic waters, as well as an increase in shower and isolated thunderstorm activity.

Rest Of Tonight
East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 8 seconds. Scattered showers.
Friday
East winds 10 to 15 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 7 seconds. Scattered showers through the day.
Friday Night
East winds 15 to 20 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 7 seconds. Scattered showers.
Saturday
East winds 10 to 15 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 8 seconds. Isolated showers.
Saturday Night
East winds 10 to 15 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 10 seconds. Scattered showers and isolated thunderstorms.
Sunday
East winds 10 to 15 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 10 seconds. Scattered showers and isolated thunderstorms.
Monday
East winds 15 to 20 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 10 seconds. Isolated showers.
Tuesday
East winds 15 to 20 knots. Seas 5 to 7 feet with occasional seas up to 9 feet. Dominant period 8 seconds. North swell around 4 feet. Scattered showers.
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ABOUT THIS FORECAST

Last Update: 839 PM AST Thu Aug 13 2020
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