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Next 12 Hours

Forecast data from the National Digital Forecast Database.

5 Day Forecast

• Sunday
• 
• High: 75 °
• Low: 46 °
• Partly Cloudy

• Monday
• 
• High: 77 °
• Low: 48 °
• Clear

• Tuesday
• 
• High: 86 °
• Low: 43 °
• Partly Cloudy

• Wednesday
• 
• High: 70 °
• Low: 39 °
• Partly Cloudy

• Thursday
• 
• High: 70 °
• Low: 43 °
• Clear

Area forecast discussion 
National Weather Service Boise Idaho 
233 PM MDT Sat may 18 2013 


Short term...tonight through Monday...a short wave trough moving 
through the back side of a departing long wave trough will pass 
over the area tonight and early Sunday. This will increase cloud 
cover and showers and bring a renewed risk of thunderstorms this 
evening. For Sunday...as the wave moves east...the chance of 
showers and threat for thunderstorms will be mainly in SW Idaho. 
Cooler temperatures will continue Sunday...with highs around 5 degrees 
below normal. A short-lived upper level ridge will move quickly 
through Monday...bringing a warm up of 5 to 10 degrees and a 
greatly decreased chance of precipitation. Winds through the short 
term will be light to moderate. The strongest winds will be Sunday 
afternoon when gusts could reach near 30 miles per hour in the upper Treasure 
valley. 


Long term...Monday night through Saturday...the brief warming and 
drying trend will continue Tuesday with the Great Basin under the 
influence of a shortwave ridge. Temperatures on Tuesday are forecast 
to reach 6-8 degrees f above normal. However this will not last long 
as a deep upper level low pressure system moving down the Washington 
coastline will bring a strong cold front through the area Tuesday 
night...dropping temperatures by around 15 degrees for Wednesday. This cut 
off low pressure system over the Pacific northwest will be the dominant 
feature through the rest of the forecast period. The models are 
struggling to pin down the motion of the low through the end of the week 
but there is good agreement that it will be stalled out over the Pacific northwest 
through the weekend. There looks to be at least a slight chance of showers 
from Wednesday onwards...mainly over southeast Oregon and the west central Idaho 
mountains. Expect temperatures to be several degrees below normal from 
Thursday and beyond. 


&& 


Aviation...VFR under broken middle-level clouds today...except for 
occasional MVFR ceilings at kmyl through this evening. Scattered showers 
and thunderstorm possible after 21z...mainly across the higher terrain of 
southeast Oregon and west central Idaho and along the Idaho/Nevada border. West-northwest 
surface winds will average 10 to 15 kts with local gusts to 25 kts. 
Northwesterly winds aloft will average 15 kts at 10k feet mean sea level. 


&& 


Boi watches/warnings/advisories... 
Idaho...none. 
Or...none. 
&& 


$$ 


Weather.Gov/Boise 


Short term...snow pellets 
long term....cb/dd 
aviation.....Cb