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Area forecast discussion 
National Weather Service Pocatello Idaho
320 am MDT Tuesday Apr 21 2015

Short through Thursday night. Trough approaching from the
Pacific northwest will increase available moisture and make the
atmosphere more and more unstable from day to day until it arrives
Wednesday night. At this point in the forecast...the skies will
stabilize and partially clear from west to east with showers still
like in areas outside of the central Idaho mountains and the Snake
River Plain/eastern Magic Valley. Most locations should clear by
late Thursday night. So have kept isolated thunderstorms in the
afternoon and evening forecasts for all afternoon and evening
periods. This corroborates with the Storm Prediction Center forecast as well for the
next three days. Main focus will be along the Idaho-Wyoming border...but
cannot rule out other areas...just less of a chance. With a weak
frontal passage Wednesday night...afternoon high temperatures from Wednesday
to Thursday should drop strongly...8 to 12 degrees. The front is not
expected to bring anything more than windy most of
the strong wind aloft will remain in the Panhandle and western
Montana. Do not expect any sort of advisory or watch at this time.
Cloud cover and wind will actually keep overnight lows Wednesday night
mild and any snow should stay at fairly high elevation. Messick

Long term...Friday through Tuesday. Extended is filled with
several systems arriving from the coast. Each of these systems
will produce enough moisture and instability for showers and a few
thunderstorms...most notably in the afternoon. Best chances appear
to be in the mountains and Highlands...although some showers in
the snake plain are possible as well. Pinpointing exact details at
this point is proving very difficult because of model


Aviation...some moisture ahead of the next storm system may produce
a few isolated storms across the mountains or Highlands. Do not
think storms will affect taf sites. Winds should remain relatively
light today.


Pih watches/warnings/advisories...


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