Active weather from Northern Rockies to Upper Midwest

A storm system in the northern U.S. will bring a variety of weather across several states from the Northern Rockies to the Upper Midwest on Saturday. Several inches of early-season snow are forecast in the higher elevations of Idaho and western Montana. Locally-heavy rain will accompany strong thunderstorms in the northern Plains and Upper Midwest.
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Hazardous Weather Conditions

Last Update: 402 AM EDT SAT SEP 5 2015

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Tampa Bay, FL Local Forecast Office

6NM SE Sanibel FL

Marine Zone Forecast

IMPORTANT NOTICE TO MARINERS...MARINE FORECASTS ARE ISSUED AT LEAST FOUR TIMES A DAY. BOATERS ON EXTENDED TRIPS SHOULD ROUTINELY MONITOR SUBSEQUENT FORECAST ISSUANCES AND UPDATES FOR THE LATEST MARINE WEATHER INFORMATION. THE WAVE HEIGHTS ARE FORECAST AS SIGNIFICANT WAVE HEIGHT WHICH IS THE AVERAGE OF THE HIGHEST ONE-THIRD OF THE WAVES. THE HIGHEST WAVES MAY RARELY BE TWICE THE SIGNIFICANT WAVE HEIGHT. THE WINDS AND SEAS NEAR THUNDERSTORMS MAY BE HIGHER THAN FORECAST.

Synopsis: A SURFACE TROUGH WILL REMAIN OVER THE REGION FOR THE NEXT FEW DAYS. THE MAIN HAZARD FOR MARINERS WILL BE THUNDERSTORM ACTIVITY EACH DAY AS WINDS AND SEAS ARE EXPECTED TO REMAIN BELOW HEADLINES FOR THE NEXT SEVERAL DAYS.

Today
Northeast winds around 10 knots then becoming northwest in the afternoon. Seas 2 feet or less. Bay and inland waters a light chop. Isolated thunderstorms in the morning...then scattered thunderstorms in the afternoon.
Tonight
North winds 10 to 15 knots then becoming east 5 to 10 knots after midnight. Seas 2 to 3 feet. Bay and inland waters a moderate chop. Isolated thunderstorms.
Sunday
East winds around 5 knots then becoming northwest around 5 knots in the afternoon. Seas 2 feet or less. Bay and inland waters smooth. Scattered thunderstorms.
Sunday Night
Northwest winds 5 to 10 knots then becoming east around 5 knots after midnight. Seas 2 feet or less. Bay and inland waters a light chop. Scattered thunderstorms.
Monday
Southeast winds around 5 knots then becoming southwest around 5 knots in the afternoon. Seas 2 feet or less. Bay and inland waters smooth. Scattered thunderstorms.
Monday Night
Southwest winds around 5 knots then becoming south after midnight. Seas 2 feet or less. Bay and inland waters smooth. Scattered thunderstorms.
Tuesday
Southeast winds around 5 knots. Seas 2 feet or less. Bay and inland waters smooth. Scattered thunderstorms.
Tuesday Night
Southwest winds around 5 knots then becoming northeast around 10 knots after midnight. Seas 1 foot. Bay and inland waters a light chop. Scattered thunderstorms.
Wednesday
East winds around 10 knots then becoming southeast around 5 knots in the afternoon. Seas 2 feet or less. Bay and inland waters a light chop. Scattered thunderstorms.
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Last Update: 402 AM EDT SAT SEP 5 2015
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