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Next 12 Hours

Forecast data from the National Digital Forecast Database.

5 Day Forecast

• Friday
• 
• High: 59 °
• Low: 36 °
• Chance of T-Storms

• Saturday
• 
• High: 63 °
• Low: 39 °
• Chance of Rain

• Sunday
• 
• High: 70 °
• Low: 43 °
• Chance of Rain

• Monday
• 
• High: 70 °
• Low: 37 °
• Partly Cloudy

• Tuesday
• 
• High: 73 °
• Low: 45 °
• Partly Cloudy

Area forecast discussion 
National Weather Service Missoula Montana 
issued by National Weather Service Great Falls Montana 
1145 PM MDT Thursday may 23 2013 


..update to aviation... 


Update... 
updated forecast is out. Only real change was to increase probability of precipitation to 
100 percent along The Divide and lower temperatures in bit in The Butte 
area. Snow is falling for many areas along The Divide...so current 
winter highlights look good. Brusda 


&& 


Aviation...moisture and lift continue to push through the area with 
widespread precipitation and MVFR/IFR conditions from ksmn to kbtm. 
Conditions are expected to improve by 12z with precipitation ending 
from south to north. After 12z...conditions should become VFR at all 
taf sites. A moist and unstable airmass will remain over the area 
Friday resulting in scattered afternoon and evening showers. Mpj 


&& 


Previous discussion... /issued 300 PM MDT Thursday may 23 2013/ 


Discussion...western Montana and north central Idaho are 
currently in between weather features this afternoon, which has 
allowed US a brief respite from precipitation. This will be short 
lived however as another wave of energy is expected to rotate 
around the low pressure system currently sitting in the Pacific 
northwest. This wave has an impressive amount of lift associated 
with it and thus another round of potentially heavy wet snow is 
expected late this afternoon through Friday morning. The locations 
with the greatest likelihood of seeing impactful snow this evening 
include southwest Montana (butte, Georgetown Lake, Anaconda, 
MacDonald Pass and Homestake pass), and Lemhi County (lost Trail 
Pass, Salmon, Gilmore summit). Locations further north along the 
Continental Divide (west Glacier, Swan Lake, Condon, Seeley lake) 
will likely see more snow develop overnight into the early morning 
hours. The main impact from this next round of snow will be 
slushy/slick roadways, breakage of tree limbs which have already 
been weakened by today`s snow, and periods of very low visibility 
due to convective showers bringing short lived periods of intense 
snowfall. Additional power outages are possible. Various winter 
weather products will remain in effect through Friday morning. 


This next wave of energy will exit the region tomorrow morning, 
bringing a somewhat drier period for the morning. This will be 
again, short-lived however as yet another wave of energy rotates 
around the low pressure system bringing enhanced showers across 
all of western Montana and north central Idaho. The main focus of 
these showers does appear to be across northwest Montana where 
another round of snow showers is possible. Forecast models do 
indicate snow levels beginning to rise during this time so 
accumulating snow should not be as impactful as the latest waves 
moving through the region. 


For the Holiday weekend it does appear conditions will moderate 
slightly back towards more normal conditions for this time of 
year. The threat of precipitation will be on the decline although 
their could be some lingering showers?Particularly in the 
afternoons. Temperatures will rise back to near normal for this 
time of year. 


By Monday another trough of low pressure is expected to pump 
moisture and energy back into the region bringing precipitation 
back into the forecast. This could translate into thunderstorms 
across the region by Tuesday and Wednesday. 


&& 


Note: flood watches...warnings and advisories will not be listed below. 


Mso watches/warnings/advisories... 
Montana...Winter Storm Warning until 9 am MDT Friday Butte/Blackfoot 
region. 


Winter Weather Advisory until 9 am MDT Friday 
Bitterroot/Sapphire Mountains. 


Winter Weather Advisory until 9 am MDT Friday Potomac/Seeley 
Lake region...West Glacier region. 


Idaho...Winter Weather Advisory until 9 am MDT Friday eastern 
Lemhi County. 


&& 


$$