Area Forecast Discussion
Issued by NWS Pocatello, ID

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FXUS65 KPIH 271921

Area Forecast Discussion
National Weather Service Pocatello ID
121 PM MDT FRI MAY 27 2016

.SHORT TERM...Tonight through Monday. An upper trof moving thru
the northern Rockies will result in lingering showers/isolated
tstms mainly near the Divide and southern highlands this
eve...decreasing in coverage overnight. The trof remains on
Sat...but flattening to near zonal flow. Isold showers/tstms
remain possible near the Divide again Sat aftn/eve. Another trof
moves thru the Pac NW on Sun...with widely scattered showers/tstms
over the mtns Sun aftn/night. On Mon...the upper trof moves east
with showers/tstms remaining near the MT/WY border. Temps will be
a little warmer Sun and Mon. Hedges

.LONG TERM...Mon night through next Fri night. 500mb long wave
pattern continues to feature a Pacific trough that retrogrades
westward and allows 500mb height rises over the Great Basin, so
expect warming and drying for the latter portion of this extended
period. After Mon night, very little precipitation threat for the
remainder of the week. Especially after Tue evening, 500mb heights
rise to 578Dm or more, which should substantially end anything
except afternoon and evening convection, which should amount to
precious little. Do not see any significant wind under the ridge;
only on Mon night as wind continues during a trough passage that may
linger into the night hours. Tue should be the coolest day after the
trough, but a strong warming trend with the nearly clear skies will
allow a warming into the 80s for the Snake River plain by Thu/Fri.



.AVIATION...Wind has been gusting but slow to increase, so delayed
onset of windy conditions (20kt sustained) until mid-afternoon.
Moisture and clouds of the morning hours are drying out for the most
part, and so -TSRA threat has dwindled and see at most just a few
hours of VCTS at the airdromes in the Snake River plain. KSUN is a
slightly different story, with showers on top of them at TAF
issuance time. This should also dry up, probably by late afternoon.
Expect no impact to CIGs or VSBYs. Messick


.PIH Watches/Warnings/Advisories...
Lake Wind Advisory until 8 PM MDT this evening for IDZ021.


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