Heavy Rain in the Southern Appalachians; Heat Continues in the West; Monitoring Tropical Storm Erin

Heavy to excessive rain falling over the southern Appalachians may bring areas of flooding into Wednesday. Hot temperatures are in place through Wednesday across parts of the western U.S. and New England. Tropical Storm Erin is forecast to become a Hurricane by late this week as it moves westward across the central Atlantic Ocean. Monitor forecasts for any Puerto Rico or U.S. East Coast impacts. Read More >

Hazardous Weather Conditions

Hazardous Weather Outlook

Current conditions at

Spearfish / Clyde Ice (KSPF)

Lat: 44.48°NLon: 103.78°WElev: 3898ft.

Fair

72°F

22°C

Humidity	53%
Wind Speed	N 12 mph
Barometer	29.92 in
Dewpoint	54°F (12°C)
Visibility	10.00 mi
Last update	13 Aug 4:15 am MDT

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

4 Miles S Lead SD

Overnight
Low: 67 °F
Chance
T-storms
Wednesday
High: 83 °F
Mostly Sunny
then Severe
Thunderstorms
Wednesday Night
Low: 56 °F
Severe
Thunderstorms
then Partly
Cloudy
Thursday
High: 82 °F
Sunny
Thursday Night
Low: 55 °F
Partly Cloudy
then Slight
Chance
T-storms
Friday
High: 78 °F
Mostly Sunny
then Slight
Chance
T-storms
Friday Night
Low: 56 °F
Slight Chance
T-storms
Saturday
High: 74 °F
Partly Sunny
then Chance
T-storms
Saturday Night
Low: 54 °F
Chance
T-storms

Detailed Forecast

Overnight

A 30 percent chance of showers and thunderstorms, mainly before 5am. Mostly cloudy, with a steady temperature around 67. Southwest wind around 5 mph, with gusts as high as 20 mph.

Wednesday

A 20 percent chance of showers and thunderstorms after 3pm. Some of the storms could be severe. Mostly sunny, with a high near 83. Southwest wind around 5 mph becoming northwest in the afternoon. Winds could gust as high as 15 mph.

Wednesday Night

A 20 percent chance of showers and thunderstorms before 7pm. Some of the storms could be severe. Partly cloudy, with a low around 56. Southwest wind around 5 mph.

Thursday

Sunny, with a high near 82. Southwest wind around 5 mph becoming north in the afternoon. Winds could gust as high as 15 mph.

Thursday Night

A 20 percent chance of showers and thunderstorms after midnight. Mostly cloudy, with a low around 55. North wind around 5 mph becoming calm in the evening.

Friday

A 20 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 78. South wind around 5 mph becoming east in the afternoon. Winds could gust as high as 15 mph.

Friday Night

A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 56. East wind around 5 mph becoming south after midnight.

Saturday

A chance of showers and thunderstorms after noon. Partly sunny, with a high near 74. South wind around 5 mph becoming east in the morning. Winds could gust as high as 15 mph.

Saturday Night

A chance of showers and thunderstorms. Mostly cloudy, with a low around 54.

Sunday

A chance of showers and thunderstorms, mainly after noon. Mostly sunny, with a high near 76.

Sunday Night

A chance of showers and thunderstorms. Partly cloudy, with a low around 54.

Monday

A slight chance of showers and thunderstorms. Sunny, with a high near 79.

Monday Night

A slight chance of showers and thunderstorms. Mostly clear, with a low around 56.

Tuesday

A slight chance of showers and thunderstorms. Sunny, with a high near 79.