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Next 12 Hours

Forecast data from the National Digital Forecast Database.

5 Day Forecast

• Saturday
• 
• High: 77 °
• Low: 46 °
• Partly Cloudy

• Sunday
• 
• High: 77 °
• Low: 46 °
• Chance of a Thunderstorm

• Monday
• 
• High: 72 °
• Low: 48 °
• Partly Cloudy

• Tuesday
• 
• High: 75 °
• Low: 50 °
• Mostly Cloudy

• Wednesday
• 
• High: 79 °
• Low: 48 °
• Partly Cloudy

Area forecast discussion 
National Weather Service Boise Idaho 
248 PM MDT Friday may 24 2013 


Short term...tonight through Sunday...the Memorial Day weekend 
will start off dry as the upper low that has been parked over 
Washington state lifts into Canada. Showers and isolated 
thunderstorms over east-central Oregon and SW Idaho this afternoon 
will dissipate by sunset. Air mass modifies into Saturday on 
strengthening SW flow. Only a slight chance of showers or 
thunderstorms over mountains on Saturday as large scale forcing is 
absent so development is dependent on afternoon instability which 
is marginal. Clouds increase Sunday ahead of a short wave trough 
moving into the Pacific northwest. There are some differences on timing the 
feature. It becomes negatively tilted as it moves inland which 
will likely slow it down which would follow the GFS and European model (ecmwf) 
solutions. Height falls and increased dynamical forcing will favor 
shower and thunderstorm development over southeast Oregon and much of SW 
Idaho by late Sunday afternoon. Cloud cover could cap development 
in the Snake River Valley of Idaho so have only slight chance 
there. Raised the chance of precipitation elsewhere across southeast 
Oregon and mountains of SW Idaho for Sunday afternoon where confidence 
is higher. More clouds and some cooling aloft will take 3-7f 
degrees off of high temperatures from Saturday to Sunday. 


Long term...Sunday night through Friday...the Pacific northwest 
remains under a broad upper trough through the extended period. 
Monday looks to be the driest and warmest day next week as region 
will be between low pressure systems. Increased moisture associated 
with the next upper trough on Tuesday will bring precipitation 
across the entire area. At the moment...this looks like the best day 
for widespread precipitation. Latest model guidance is trending this 
system further north across the forecast area Tuesday. Models are 
not in total agreement with this idea as a few GFS ensemble members 
and the 12z European model (ecmwf) continue to show the trough closing over central 
Nevada as it moves east. However...more solutions are trending 
towards the GFS open wave across the forecast area and thus have 
trended the forecast in this direction. This system lingers over the 
region through Wednesday and is followed quickly by another system 
Thursday/Friday. These system will continue the chance of showers 
and thunderstorms through Friday. Temperatures will remain below 
normal through out the extended period. 


&& 


Aviation...VFR. Scattered showers and a slight chance of 
thunderstorms across southeast Oregon and the west central mountains of 
Idaho through 00z. Snow levels generally 5k to 6k feet mean sea level. Light 
surface winds this morning will become westerly up to 10 kts after 
18z. Southwest winds aloft will average 20 kts up through 10k feet 
mean sea level. 


Weekend outlook...VFR Saturday. Scattered showers developing 
Saturday night over the higher terrain of eastern Oregon...and the 
west central Idaho mountains...spreading over most of southeast 
Oregon and southwest Idaho by Sunday afternoon. Snow levels rising 
to over 8k feet mean sea level by Sunday morning. Slight chance of thunderstorms 
across the entire area Sunday afternoon and evening 


&& 


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


$$ 


Weather.Gov/Boise 


Short term...dg 
long term....js/wh 
aviation.....Js