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Next 12 Hours

Forecast data from the National Digital Forecast Database.

5 Day Forecast

• Wednesday
• 
• High: 57 °
• Low: 41 °
• Rain

• Thursday
• 
• High: 64 °
• Low: 50 °
• Partly Cloudy

• Friday
• 
• High: 73 °
• Low: 50 °
• Chance of a Thunderstorm

• Saturday
• 
• High: 72 °
• Low: 54 °
• Partly Cloudy

• Sunday
• 
• High: 73 °
• Low: 52 °
• Partly Cloudy

Area forecast discussion for western South Dakota and northeastern Wyoming 
National Weather Service Rapid City South Dakota 
250 am MDT Wednesday may 22 2013 


Short term...today through Thursday night 
issued at 218 am MDT Wednesday may 22 2013 


Current surface map shows weak ridge of high pressure across the 
western Dakotas. Upper low that has been over the eastern Dakotas 
the past few days is shifting eastward...with most of the showers 
activity over eastern South Dakota. Isolated showers/drizzle 
possible across western South Dakota this morning. Abundant low 
level stratus will remain across much of the forecast area through 
the day as winds become NE-east this will keep highs around 10 
degrees below average. 


Deep upper low over the Pacific northwest will begin to influence 
the area Thursday with strong pressure falls across 
Montana/Wyoming with developing surface low. Tight pressure 
gradient across northeast Wyoming/western South Dakota will result 
in windy conditions. Some weak surface based instability across 
northeast Wyoming and the Black Hills Thursday afternoon. 
However...with lack of upper level forcing and strong cap win 
place will not add thunderstorms to the forecast. 




Long term...Friday through Tuesday 
issued at 218 am MDT Wednesday may 22 2013 


Southwesterly flow aloft develops over the region Friday as ridge 
shifts to the east and upper low spins in place over the Pacific northwest. 
This pattern will persist through at least the first half of next 
week and bring daily chances for showers and thunderstorms. Lee 
trough/dry line will remain nearly stationary across eastern Montana and 
eastern Wyoming through the period. Moist south/southeast low level flow 
will persist to the east of the trough across the Black Hills area 
and the plains to the east. This is where the better chances for 
thunderstorms and potential severe weather will be...especially 
Sunday and early next week. Temperatures will rise to above average 
levels on Friday and persist through the Holiday weekend...with the 
warmest temperatures across western portions of the County Warning Area. 


&& 


Aviation...for the 06z tafs through 06z Wednesday night 
issued at 218 am MDT Wednesday may 22 2013 


Isolated light rain showers will persist across areas east of the 
Black Hills this morning. Fairly widespread MVFR/IFR ceilings will 
remain across the forecast area this morning as low level moisture 
remains. Conditions will improve to VFR over northeastern Wyoming by 
midday...and over much of western South Dakota by late in the 
afternoon. However...at least some areas of MVFR/IFR ceilings are 
likely to redevelop tonight across the plains. 


&& 
Unr watches/warnings/advisories... 
South Dakota...none. 
Wyoming...none. 
&& 


$$ 


Short term...7 
long term...26 
aviation...26