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Next 12 Hours

Forecast data from the National Digital Forecast Database.

5 Day Forecast

• Monday
• 
• High: 40 °
• Low: 27 °
• Snow

• Tuesday
• 
• High: 38 °
• Low: 23 °
• Chance of Snow

• Wednesday
• 
• High: 40 °
• Low: 22 °
• Partly Cloudy

• Thursday
• 
• High: 43 °
• Low: 29 °
• Partly Cloudy

• Friday
• 
• High: 45 °
• Low: 29 °
• Partly Cloudy

Area forecast discussion 
National Weather Service Boise Idaho 
836 PM MST sun Feb 12 2012 


Discussion... 
fairly quiet weather this evening as weak upper trough exits the 
area. The only remnants that remain are low and middle clouds over 
the Magic Valley and also the Frank church wilderness area. Those 
should continue to exit tonight. Otherwise attention now moves to 
the next low moving onshore near the California/or border. Latest nam12 model 
very similar to 12z/18z model runs in driving it into northern 
California and the Great Basin overnight. Models continue to show 
difluence aloft over southeast Oregon through the southern 
Highlands tonight through tmrw. Current pop forecast looks good 
keeping best probability of precipitation south of a line from Burns to Twin Falls. High 
clouds expected to move across the zones just after midnight...so 
concerned on how much fog the area may really see overnight. Dont 
have a huge aerial extent so will leave current forecast alone. 




&& 


Aviation...VFR through Monday afternoon...except near and south 
of kbno where MVFR/local IFR in snow showers will develop after 
12z...and near kmyl where IFR/LIFR fog will be possible overnight. 
Elsewhere increasing clouds overnight...with lowering ceilings 
during the day Wednesday. Best chance of showers Wednesday will be 
over southern areas of Oregon...and south of the Snake River Plain 
in Idaho. Surface winds will be light north or northwest through 
Wednesday afternoon. Light northwest winds aloft up to 10 kts at 
10k feet mean sea level. 


&& 


Previous discussion... 
short term...tonight through Tuesday...west winds 10 to 20 miles per hour 
across the area...with gusts up to 30 miles per hour around Mountain Home... 
will diminish after sunset to light diurnal. Isolated snow 
showers in the Idaho mountains will exit the region this evening 
as the slow moving upper trough progresses east. Patchy stratus 
generally from halfway Oregon through Twin Falls Idaho and 
northeastward...is expected to be slow to erode. Areas where it 
does so will be prone to patchy fog development. Have fog in the 
Long Valley and lower Treasure valley for tonight as favored areas 
per afternoon dew points and local diurnal wind circulations. Wavy 
cold front offshore this afternoon has brought light rain/drizzle 
on the Oregon coast and thin cirrus into Burns. This system is 
expected to bring up to 2 inches of snow for travel west and south 
of Burns for Monday morning...while SW Idaho remains dry. Upper 
support for the front is mainly over Harney County to the Nevada 
border west of Duck Valley through Monday....these areas expected 
to get the bulk of the precipitation 06-24z Monday. Expecting gusty 
west winds behind this first trough/front of 10 to 20 miles per hour gusting 
to 30 miles per hour in windier areas...behind the front Monday afternoon. 
Northern branch upper support is weaker and crosses southeast Oregon 
Monday night and SW Idaho very early Tuesday morning with low probability of precipitation 
and minimal quantitative precipitation forecast. Expect winds 10-20 miles per hour Tuesday afternoon across 
the area behind the northern branch trough/front. The pattern 
will keep temperatures near to around 3 degrees above normal in 
the short term. 


Long term...Tuesday night through Sunday...model runs showing 
improved agreement regarding an upper level low...which is now 
prognosticated to affect the forecast area Tuesday night through Wednesday 
morning. Low will bring cool conditions and light snowfall to southeast 
Oregon and the Idaho/Nevada border by early Wednesday. Western snake plain 
now looks to remain dry. Low will exit by Wednesday afternoon - 
leaving the latter half of the week to be dominated by above normal 
temperatures under ridging aloft. The next notable Pacific low will 
dig into the Pacific northwest next weekend. Expect a return to 
cooler/unsettled weather by Saturday afternoon. 


&& 


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


$$ 


Weather.Gov/Boise 


Discussion...CR 
aviation.....Bb 
previous short term...vm 
previous long term....Mt/wh