Weather

581 
fxus65 kmso 272320 aaa 
afdmso 


Area forecast discussion...updated 
National Weather Service Missoula Montana 
520 PM MDT Wednesday Aug 27 2008 


Update...canceled the lake Wind Advisory for Flathead Lake. 


&& 


Discussion...as the upper level jet moves off to the east...winds 
have begun to diminish across the Flathead Lake area. As a result the 
advisory has been canceled, however...winds may still occasionally 
gust up to 25 miles per hour through this evening. The High Wind Warning 
still remains in effect until 900 PM MDT tonight for elevations 
above 6500 feet in Glacier National Park including Logan Pass. 
Gusts as high as 77 miles per hour have recently been reported at Logan 
Pass...so no changes have been made to the High Wind Warning at 
this time. 


&& 


Aviation...the dynamics associated with an upper level jet will 
keep low and middle level clouds with a few embedded showers going 
throughout the night...especially in northwest Montana. The cloud 
cover will obscure mountain tops and passes at times. The gusty 
westerly winds should diminish tonight as the jet gets pushed 
northward into Canada. 




&& 


Previous discussion... /issued 217 PM MDT Wednesday Aug 27 2008/ 


Discussion...a strong upper level jet continues to stream across 
the northern rockies this afternoon and evening. The dynamics 
associated with the jet will keep a few showers in northwest 
Montana especially along the Continental Divide. Gusty westerly 
winds will persist across the region with a few locations like Logan 
Pass gusting to 60 miles per hour. A ridge of high pressure will build back 
over the northern rockies Thursday into Friday causing the jet to 
be pushed up into Canadian. Clouds will persist across northwest 
Montana...but shower activity will be minimal. Temperatures should 
gradually warm to near normal readings by Friday. 


Friday night through Monday will be a transition period over the 
inter mountain west. Models are in decent agreement with the ridge 
beginning to break down Saturday as an impressive upper level 
trough moves onshore. There are some timing differences...but the 
general theme is increasing clouds and winds Saturday afternoon 
with a cold trough digging over the Pacific northwest. This trough 
will dig to the south and move over the Idaho/Nevada border Sunday 
night. This location will mean southwest Montana will finally see 
some precipitation while northwest Montana will see lesser 
amounts. The other big news will be below normal highs for Sunday 
and well below normal on Monday as the trough moves through. This 
system will finally move east Monday night as a transitory weak 
shortwave ridge builds over north central Idaho and western 
Montana. This will quickly be replaced by another shortwave trough 
on Wednesday...but at this time...northwest Montana looks most 
affected. 


&& 


Mso watches/warnings/advisories... 
Montana...High Wind Warning until 9 PM MDT this evening for West Glacier 
region. 


Idaho...&& 


$$ 


Short term...allegretto/Smith 
long term....Mead 
aviation...Smith