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Next 12 Hours

Forecast data from the National Digital Forecast Database.

5 Day Forecast

• Monday
• 
• High: 68 °
• Low: 36 °
• Partly Cloudy

• Tuesday
• 
• High: 70 °
• Low: 39 °
• Chance of a Thunderstorm

• Wednesday
• 
• High: 48 °
• Low: 28 °
• Chance of Rain

• Thursday
• 
• High: 54 °
• Low: 28 °
• Chance of Rain

• Friday
• 
• High: 52 °
• Low: 30 °
• Chance of Rain

Area forecast discussion 
National Weather Service Boise Idaho 
243 PM MDT Monday may 20 2013 


Short term...tonight through Wednesday...upper level short wave 
ridge moves through overnight and brings significant warming 
tomorrow before a large strong cutoff low moves in late Tuesday and 
Wednesday to dramatically cool US. Winds will increase tomorrow... 
especially across southeast Oregon. As a strong cold front moves through 
tomorrow afternoon and evening...winds will switch to northwest and 
become gusty for several hours. Showers and thunderstorms will 
form along and ahead of the front...especially across the northern 
part of the County Warning Area...mainly in Baker County and in the mountains of SW 
Idaho. Temperatures Tuesday will warm about 10 degrees over today... 
before dropping about 25 degrees for Wednesday behind the cold 
front. Conditions will be breezy on Wednesday...especially in the 
upper Treasure and western Magic Valleys...as northwest winds continue. 
These winds will be due to the surface pressure gradient...as 
there will not be any strong winds aloft to mix down. Showers will 
continue Wednesday mainly across the north as the influence of the upper 
low works together with the higher terrain to provide lift. 


Long term...Wednesday night through Monday...generally south to 
southwest flow aloft from Wednesday night through early next week 
as the Great Basin will be on the southern portion of a cut off 
low pressure system centered over the Pacific northwest. Most of 
the moisture associated with this feature will be close to the low 
pressure circulation which will bring showers and possibly 
afternoon thunderstorms to southeast Oregon and the west central Idaho 
mountains by Saturday night the pattern will shift into more of an 
open wave trough over the western United States. The coldest 
temperatures will be on Thursday /around 10 degrees below normal/ 
when the core of the low is closest to southeast Oregon and SW Idaho. 
Expect a warming trend through the weekend with temperatures reaching 
near normal values by Sunday and Monday. 


&& 


Aviation...widespread VFR under mostly clear skies. West-northwest surface 
winds generally 15 kts or less. Surface winds becoming south- 
southeast after sunset and increasing to 10-15 kts after 18z 
Tuesday. Light and variable winds aloft will become SW at 25 kts 
up through 10k feet mean sea level after 06z. 


&& 


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


$$ 


Weather.Gov/Boise 


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