Local Storm Reports

Precipitation Forecast

Liquid Precipitation

Snowfall

Ice

Range of 3-Day Snowfall Possibilities

Probability of Snow Amounts

Winter Storm Severity Index

Day 1

Day 2

Day 3

WSSI Web Page

WSSI Fact Sheet

Additional Weather Elements

(mouse over day or period to see map below)

Max Temperature	Day 1		Day 2		Day 3		Day 4		Day 5
Min Temperature	Day 1		Day 2		Day 3		Day 4		Day 5
Wind Chill	Period 1	Period 2	Period 3	Period 4	Period 5	Period 6	Period 7	Period 8	Period 9
Max Wind Gust	Period 1	Period 2	Period 3	Period 4	Period 5	Period 6	Period 7	Period 8	Period 9
Chance of Precip	Period 1	Period 2	Period 3	Period 4	Period 5	Period 6	Period 7	Period 8	Period 9
BH Snow Depth	Period 1	Period 2	Period 3	Period 4	Period 5	Period 6	Period 7

Forecast Timelines

Single Site Timelines

Detailed Point Forecast

(click map to change the location of the forecast listed below the map)

Climate Outlooks

8-14 Day Temp Outlook

8-14 Day Precip Outlook

Travel Conditions

South Dakota

Wyoming

Interactive Travel Forecast Page

Winter Weather Definitions

Winter Storm 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 1/4 mile is expected or occurring.

Ice Storm WARNING:

Ice accumulations of 1/4 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.

Wind Chill WARNING:

Wind chill values -35 degrees F or colder.

Wind Chill ADVISORY:

Wind chill values between -25 degrees and -35 degrees 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.

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.