Western South Dakota and Northeastern Wyoming Winter Weather Briefing Page


Watches, Warnings, and Advisories	Weather Story	South Dakota Snowfall Forecast	Rapid City, SD Radar	Bowman, ND Radar	Satellite Images	National Forecast

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Local Information
Hazardous Weather Outlook	Forecast Discussion	Winter Weather Watch, Warning, & Advisory Bulletins	Other Watch, Warning, & Advisory Bulletins	Storm Reports

Current Conditions
South Dakota NWS	South Dakota State University Network	Wyoming NWS	Mesowest

Snowfall Observations & Graphics

Satellite-derived Snow Cover Images	Snowfall Analysis Graphic	CoCoRaHS South Dakota	CoCoRaHS Wyoming	Graphical Forecasts

Snowfall Probability Forecasts

Day One	Day Two	Day Three
Additional graphics, forecasts, and disucssions are available at: NWS Hydrometeorological Prediction Center Winter Weather Forecasts

Winter Weather Definitions

Winter Storm or Blizzard WATCH: A winter storm or blizzard is POSSIBLE, but the timing and area affected are still uncertain.

Winter Storm WARNING: A dangerous winter storm with snow, freezing precipitation, strong winds, and/or cold temperatures is expected or occurring.

Blizzard WARNING: A severe winter storm with winds 35 mph or greater and snow or blowing snow reducing visibility to less than ¼ mile is expected or occurring.

Ice Storm WARNING: Ice accumulations ¼ inch or more that could cause dangerous conditions and significant damage is expected or occurring.

Winter Weather ADVISORY: Three to five inches of snow, blowing snow, light freezing precipitation, strong winds, and/or cold temperatures are expected or occurring.

Freezing Rain ADVISORY: Light freezing precipitation is expected or occurring.

Wind Chill WARNING: Wind chill values -35° F or colder.

Wind Chill ADVISORY: Wind chill values between -25° and -35° F.

High Wind WARNING: Sustained winds 40 mph or greater or wind gusts 58 mph or greater.

Wind ADVISORY: Sustained winds 30 to 39 mph or wind gusts 45 to 57 mph.

Blowing Dust WARNING: Visibilities at or below 1/4 mile.

Blowing Dust ADVISORY: Visibilities between 1 and 1/4 mile.

Dense Fog ADVISORY: Visibilities at or below 1/4 mile.

Freeze WARNING: Temperatures 32 degrees or colder for several hours over a widespread area during the growing season, generally May 1 through October 15.

Frost ADVISORY: Temperatures 33 to 36 degrees, clear skies, and light winds for several hours over a widespread area during the growing season, generally May 1 through October 15.

Extreme Cold WARNING: Air temperatures -35 ° F or colder with calm or very light winds.

Wind Chill Chart

Hazardous Weather Outlook contains a summary of active watches, warnings, and advisories and an outlook of potential winter storms, severe thunderstorms, flooding, and other hazard weather for the next seven day.

National Weather Service Weather Forecast Office

Western South Dakota and Northeastern Wyoming Winter Weather Briefing Page