Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 182045

Area Forecast Discussion
National Weather Service Boise ID
245 PM MDT Wed Sep 18 2019

.SHORT TERM...Tonight through Friday...Widespread rain and
isolated thunderstorms will continue across much of the region
this evening. Some of the stronger cells have produced brief heavy
rain. Some spots in the mountains could see near an inch of rain
total though most areas will see about 0.25 to 0.50 inches through
Thursday. As the low moves over the forecast area late tonight,
another precipitation band develops over the Boise Mountains and
Western Magic Valley bringing periods of moderate rainfall. The
band lifts northeast Thursday morning with more convective showers
and thunderstorms developing Thursday afternoon. The best chance
for precipitation will be along the Nevada border and in the West
Central and Boise Mountains. Dry conditions follow for Friday as
under cool northwesterly flow. Temperatures will remain well below
normal through the period.

.LONG TERM...Friday night through Monday...A weak ridge will
move across the region on Saturday bringing mostly sunny skies and
seasonable temperatures. Another trough, very similar to todays
will move across the region on Sunday night. Expect showers
overnight into Monday. Conditions will clear out on Monday
afternoon. Temperatures will be cool as the system moves through
but quickly rebound as conditions dry out.

Monday night through Wednesday...Clear to partly cloudy skies across
most of the region as drier, more stable ridging rolls (moves) in
and dominates. Look for breezier northwest winds until Tuesday
night, becoming lighter and switching to westerly afterwards. Expect
(average) highs and lows to register near the normal ranges.


.AVIATION...Scattered showers and isolated thunderstorms through
this evening. Expect mountain obscuration and areas of MVFR
conditions. Snow levels 8k-9k feet MSL today lowering to 7k-8k feet
MSL Thursday. Surface winds SW-NW 5-15kt with gusts up to 30kt in
thunderstorms. Winds aloft at 10k feet MSL southwest 20-30kt
becoming variable 5-10kt by 12z/Thu.





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