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Next 12 Hours

Forecast data from the National Digital Forecast Database.

5 Day Forecast

• Wednesday
• 
• High: 73 °
• Low: 39 °
• Chance of T-Storms

• Thursday
• 
• High: 57 °
• Low: 36 °
• Chance of T-Storms

• Friday
• 
• High: 59 °
• Low: -47 °
• Chance of T-Storms

• Saturday
• 
• High: 55 °
• Low: 37 °
• Chance of Rain

• Sunday
• 
• High: 68 °
• Low: 43 °
• Partly Cloudy

Area forecast discussion 
National Weather Service Missoula Montana 
323 am MDT Wed Jun 19 2013 


..mountain snow to impact marias, Logan, lost trail passes 
Thursday morning... 


Discussion...the upper low pressure system will slowly enter the 
region today, setting up for a very wet and cool day. Heavy rain 
has already been falling in the Clearwater Mountains overnight and 
this morning, and is expected to continue through most of the day. 
This region and the Idaho Panhandle, including northwestern 
Montana will likely to pick up the heaviest rain today, with 1" to 
2" inches possible. Heavy rain will likely cause local streams and 
rivers to rise, however flooding is not anticipated at this time. 
Elsewhere in western Montana, showers and thunderstorms are 
expected to develop ahead of the main shield of precipitation this 
afternoon. These storms are not expected to be as strong as we saw 
yesterday, though they could produce very heavy rain, gusty winds, 
and small hail. Later this afternoon and evening, heavy rain is 
expected to finally make in and around the Glacier National Park 
area. An additional 1.00" to 1.50" inches of rain is possible, and 
with already saturated ground, runoff from the rain could 
potential cause small rock and mudslides. Keep apprised to any 
changes to the forecast, and those spending anytime outdoors today 
should keep an eye to the sky. 


Wednesday night into Thursday morning snow levels will fall to 
around 6000 feet as the coldest part the upper level low moves 
east across the northern rockies. The heaviest precipitation will 
be on the leading edge of the system, and should fall as rain. 
However, snow is expected to affect Logan Pass and Glacier 
National Park Thursday morning, and higher elevations in the park 
throughout the day. Marias and lost trail passes will also be 
affected by light snow accumulations Thursday morning around 1 to 
2 inches. Accumulation on roadways is possible, so early morning 
travelers should be prepared for winter driving conditions over 
the passes. 


Friday and Saturday will remain cool and showery as the system 
slowly progresses east. Sunday afternoon into have the potential 
to be nice with a weak ridge building ahead of the next system. 
However, moist southwest flow from a digging trough off the 
Washington coast may also cause thunderstorms. Generally, the 
unsettled weather will continue well into next week. 


&& 


Aviation...an upper level low over Washington state continues to 
meander east over the northern rockies today. Expect increasing 
mountain obscurations and thunderstorms embedded in a broader 
area of increasing clouds. Main threat from thunder storms is 
heavy rain, but especially kmso and kgpi will be affected. 




&& 


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


$$ 


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