Area Forecast Discussion
Issued by NWS Pocatello, ID

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FXUS65 KPIH 280905

Area Forecast Discussion
National Weather Service Pocatello ID
305 AM MDT Fri Jul 28 2017

.DISCUSSION...Southeast Idaho will be situated within a broad southwest
flow regime through Saturday. Embedded disturbances within this
flow will act to aid in the development of isolated showers and
thunderstorms. The best chance for the most numerous coverage
appears to be Saturday afternoon and evening, with high terrain
areas favored for development with lesser chances across the Snake
Plain. Any thunderstorm will be capable of producing gusty
outflow winds. Otherwise, a strong and hot ridge of high pressure
will begin to encroach on Southeast Idaho on Sunday and gradually
strengthen through the week. The strength of this ridge is
forecast to rival the strong ridge that was in place across the
region earlier this month. This will mean a return to hot
temperatures, with a gradual warmup expected each day, peaking on
Thursday or Friday. Highs of at least the mid-90s are expected
across the Eastern Magic Valley, Southern Snake Plain and Southern
Highland Valleys, with 100 degree highs possible towards Shoshone
and Richfield. Given excellent forecast guidance agreement, have
bumped high temperatures up a few degrees all areas Tuesday-
Friday. In terms of precipitation, an isolated shower or
thunderstorm is possible each day, particularly in high terrain
areas. AD/Hedges


.AVIATION...More westerly flow today will push much of the monsoon
moisture out of the are. Showers/tstms are still expected over the
mtns this aftn/eve...but stay north of KSUN and KDIJ. VFR will
prevail into Sat...altho some patchy fog is possible in the upper
Snake Rive Plain this morn due to wet ground and light winds.


.FIRE WEATHER...A shift in the upper flow has pushed much of the
monsoon moisture off to the east...but enough remains to fuel widely
scattered showers and isolated thunderstorms this afternoon and
evening across the central Idaho mountains and along the Divide.
Isolated activity also possible near the southern Idaho border.
Thunderstorms remain capable of producing gusty outflow winds.
Isolated to widely scattered showers and thunderstorms remain
possible into next week over the mountains. The upper ridge builds
up next week over the Great Basin and northern Rockies for a return
to hot temperatures and low humidity. Hedges



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