Area Forecast Discussion
Issued by NWS Pocatello, ID

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FXUS65 KPIH 240725

Area Forecast Discussion
National Weather Service Pocatello ID
125 AM MDT Tue Apr 24 2018

.SHORT TERM...Today through Thursday night. High pressure builds
across the west through the rest of the week. The ridge is shifted
a bit west Wednesday evening as a storm drops into the Northern
Plains, clipping the Divide. There might be a few showers pop up
but the potential is pretty low at this point. The ridge shifts
east again and will be along the Divide by Thursday night. Expect
temperatures to quickly warm in the coming days. Initially with
drier air in place, we are looking chilly nights and warm
afternoons. Late in the week, expect lows to more likely remain
above freezing even in typical colder spots. Keyes

.LONG TERM...Friday through Tuesday.

Large upper level low pressure system will move into the Pacific
Northwest for next weekend. Warm temperatures will continue into
Friday, but overall conditions will begin to deteriorate with
showers likely by Friday night or Saturday. The low will produce
unsettled conditions across the region throughout the weekend and
into early next week. Snow levels will fall to around 7500 feet or
so, which shouldn`t create too many impacts. As a whole, not too
many impacts from this system except for those who were hoping for
warm dry weather for outdoor activities.




Will start out the day with somewhat brisk downvalley winds
across the Snake Plain and Magic Valley. Otherwise, few impacts to
aviation today with any ceilings likely to remain VFR.



.HYDROLOGY...Dry weather will persist through most of this week.
Initially we will see colder overnight lows due to drier air
moving in, but that changes by the end of the week. This will
accelerate snowmelt and the potential for higher flows across
eastern Idaho. Right now, the only rivers currently having issues
are the Blackfoot River upstream of the reservoir, the Snake River
and Portneuf. Measurable impacts along the Blackfoot remain
isolated for now. The Portneuf has peaked, or will peak in the
next few hours, then drop again. With most of the snowpack gone in
the basin, we are likely done with any concerns in this area. The
Snake will remain high upstream of Idaho Falls due to increased
releases. Many areas are at/near bankful and will likely remain
steady unless flow increases upstream. Other areas will continue
to be monitored to see how this round of snowmelt evolves. We are
looking at the potential for more moisture this week, which could
add to any situation that develops. Keyes



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