Weather Service Report


928 
FXUS65 KBOI 250930
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
330 AM MDT Tue Jul 25 2017

.SHORT TERM...Today through Wednesday...SE Oregon and SW Idaho
reside on the northern fringes of monsoon moisture which extends
into the Great Basin. The moisture is being directed into our 
area from an upper trough near the northern California coast. The 
highest precipitable water values of around an inch exist across 
the southern parts of the forecast area. This also where the 
models are indicating the best instability and therefore the 
greatest potential for thunderstorms with heavy rain. A Flash 
Flood Watch is in effect for these areas this afternoon and 
evening. The upper trough is projected to track very slowly to the
northeast through northern California tonight and Wednesday. The 
moist unstable southwest flow will continue to support a chance of
showers and thunderstorms on Wednesday, especially near the 
Nevada border and in the Boise Mountains. Temperatures will be 
near normal. 

.LONG TERM...Wednesday night through Tuesday...Upper level trough
will track over the CWA Wednesday night into Thursday. This is 
expected to continue showers and thunderstorms during the 
overnight hours and through Thursday afternoon. With precipitable 
water values near an inch, heavy rain will be a threat, despite 
storm motions of 20 kts or more. By Friday, the upper ridge to the
southeast will begin to build in once again. The GFS and ECMWF 
differ on the extent of monsoon moisture making its way into the 
area, but temperatures will nonetheless be above normal through 
the period. 

&&

.AVIATION...VFR with mid-high level clouds. Showers and 
thunderstorms, mainly south of a line KBNO-KSNT. Expect gusty 
winds near thunderstorms to 40 kts. Otherwise, surface winds 
generally 10 kts or less. Winds aloft near 10 KFT MSL: north 5-10 
kts.

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...Flash Flood Watch from noon MDT today through this evening 
     IDZ015-029-030.
OR...Flash Flood Watch from noon MDT /11 AM PDT/ today through this 
     evening ORZ061-063.

&&

$$

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SHORT TERM...BW
LONG TERM....EP
AVIATION.....EP

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Western Regional Climate Center, wrcc@dri.edu