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Next 12 Hours

Forecast data from the National Digital Forecast Database.

5 Day Forecast

• Monday
• 
• High: 79 °
• Low: 50 °
• Chance of T-Storms

• Tuesday
• 
• High: 64 °
• Low: 46 °
• Chance of T-Storms

• Wednesday
• 
• High: 61 °
• Low: 48 °
• Chance of Rain

• Thursday
• 
• High: 64 °
• Low: 45 °
• Mostly Cloudy

• Friday
• 
• High: 70 °
• Low: 45 °
• Partly Cloudy

Area forecast discussion 
National Weather Service Missoula Montana 
325 am MDT Mon may 21 2012 


Discussion...clouds will continue to increase through the day 
ahead of an approaching trough of low pressure. Showers and 
thunderstorms have already developed in western Oregon just east 
of the Cascade mountains. This area of thunderstorms will continue 
to move eastward and should arrive in central Idaho by late this 
morning or early afternoon. Winds will pick up this afternoon 
ahead of a cold front that should arrive tonight. The atmosphere 
will be unstable ahead of this front as well which will support 
the chance of thunderstorms. High temperatures today should be 
just a little lower than Sunday but the big change is expected on 
Tuesday with a near 20 degree cool down in high temperatures. 


The jet stream will remain south of the area through the end of 
the week, which will steer one disturbance after the other through 
the northern rockies. Temperatures will be at or below normal with 
some nights cold enough for frost in the Bitterroot/Missoula and 
Flathead/mission valleys. Sensitive plants left outdoor will be at 
risk for frost damage. Mountain locations and the back-country will 
see snow showers...whereas the valleys will have rain showers. 
Overnight and in the mornings 1 to 3 inches of snow may accumulate 
on elevated surfaces and unimproved roads in the back country. 


For Memorial Day weekend confidence is high that temperatures will 
be near normal, but confidence is low on if or how much 
precipitation there will be. Currently the forecast looks good for 
at least showery conditions as the jet south of the area weakens. 
However, there is also the possibility of a cut-off low forming 
over eastern Montana and causing widespread rain over western 
Montana. 


&& 


Aviation... 


Clouds will increase and lower across the northern rockies during 
the next 12 hours...as a storm system bears down on the region. 
Terrain obscurations will become more numerous after 22/01800z due 
to increase in rain shower activity. Winds near the ground will 
start picking up by this afternoon. 






&& 


Mso watches/warnings/advisories... 
Montana...none. 
Idaho...none. 
&& 


$$ 


Ml/rl/ml