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fxus63 kunr 160211 
afdunr 


Area forecast discussion for western South Dakota and northeastern Wyoming 
National Weather Service Rapid City South Dakota 
811 PM MDT Wednesday Oct 15 2008 


Discussion...latest satellite imagery and regional radar mosaic 
indicate little moisture is associated with the upper trough 
currently crossing Montana. Therefore have removed the precipitation that 
was previously mentioned over northestern Wyoming and northwestern South Dakota. Have also 
adjusted sky cover and winds per latest trends. 


&& 


Aviation...VFR conditions expected overnight with some middle/high clouds. 




&& 


Previous discussion... /issued 222 PM MDT Wednesday Oct 15 2008/ 


Discussion...current surface analysis shows weak high pressure 
over the County Warning Area. Temperatures this afternoon have struggled to warm 
out of the 40s given the cloud cover over southwest South Dakota 
and northeast Wyoming. Shortwave currently over Idaho will 
continue progressing eastward this afternoon into this evening and 
move across the County Warning Area overnight. A few sprinkles or flurries can be 
expected across portions of northeast Wyoming and far northwest 
South Dakota. A secondary wave and surface trough will push across 
the County Warning Area during the day on Thursday bringing a slight chance of 
showers to portions of western South Dakota and northeast Wyoming. 
High pressure will build over the central rockies on Friday. A 
surface trough will set up across western South Dakota on Friday 
afternoon as high pressure aloft builds over the area. 
Temperatures will warm into the the 60s to lower 70s across the 
County Warning Area on Friday. The exception will be the higher elevations of the 
Black Hills where high temperatures will be in the 50s. 


Extended...upper ridge builds across northern plains for the 
weekend. 850-700mb temperatures support highs into the 70s on 
Saturday. Weak cold front moves through Saturday night/Sunday. 
Models continue to show upper trough crossing the northern plains 
early next week bringing a chance for precipitation. 


&& 


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


$$