561 
FXUS65 KBOI 312015
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
214 PM MDT Sun Oct 31 2021

.SHORT TERM...Tonight through Tuesday night...Scattered rain showers
and isolated thunderstorms this evening in eastern and northern 
zones in Idaho as the upper low that was in Oregon this morning 
becomes a weak trough that moves across Idaho. No precipitation 
tonight in Harney or Malheur Counties, but eastern mountains in 
Baker County will have isolated showers this evening. A well-defined
Pacific frontal system near 132W will move onshore overnight and 
spread light rain into eastern Oregon Monday afternoon and western
Idaho Monday night. Rain will end in Oregon by sunrise Tuesday 
and in Idaho later Tuesday. Total rainfall will be around .10 
inch in southern valleys and up to .30 inch in the mountains and 
north. Snow level will be above 7000 feet in the north and above 
8000 feet in the south so no impacts due to snow are expected. 
Skies will generally clear Tuesday night in the south but remain 
mostly cloudy in the north. Areas of fog will form in the valleys 
later Tuesday night and persist into Wednesday morning.

.LONG TERM...Wednesday through Sunday...Models continue to be in 
good agreement through the extended period showing a progressive 
pattern continuing over the region. An upper ridge will start the
period but will then slide eastward Thursday ahead of the next 
approaching trough. Rain, and high-elevation snow, will spread 
across the forecast area Thursday afternoon into the early hours 
Friday. Snow levels will be 7000-7500 feet. A drier southwest 
flow aloft will develop by Friday afternoon as the upper ridge 
rebuilds over the region. Temperatures are expected to remain near
normal. 

&&

.AVIATION...Generally VFR conditions with the exception of pockets 
of MVFR/IFR and mountain obscuration due to low clouds across KBNO-
KLMT this afternoon. Light rain along with isolated thunderstorms
expected to spread into Idaho's West Central mountains through 
midnight tonight bringing periods of MVFR conditions and mountain
obscuration. VFR conditions expected after 01/12z. Surface winds:
variable 5 to 15 kt. Winds aloft at 10kft MSL: SW 10-20kt becoming
15 to 30 kt after 01/12z. 

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...None.
OR...None.

&&

$$

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SHORT TERM...LC
LONG TERM....CR
AVIATION.....CR