Area Forecast Discussion
Issued by NWS Pocatello, ID

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FXUS65 KPIH 080941
AFDPIH

Area Forecast Discussion
National Weather Service Pocatello ID
241 AM MST Fri Dec 8 2017

.SHORT TERM...Today through Monday. A high-amplitude blocking
ridge sits along the Cascade Range. This ridge will be the
dominant feature for us through the period. With mid and upper
level clouds lacking, fog and stratus become the primary concern
along with deteriorated air quality. Satellite imagery this
morning shows widespread fog/stratus across the Snake Plain,
extending into adjacent valleys. Guidance continues to run high on
temperatures, struggling to account for the persistent inversion.
Continued to trend temps/RH closer to persistence. Hinsberger

.LONG TERM...Monday night through next Thursday. The strong high
pressure ridge continues to hold, along with inversion conditions
and potential for patchy fog or low stratus each night. The only
feature trying to disrupt the pattern is a little disturbance riding
over the top of the ridge, brushing the Idaho Panhandle next
Tuesday. Easterly surface winds at night will try to transport some
of the low level moisture down the Snake Plain to the west side of
the state perhaps Monday night, but once the Tuesday disturbance
drops along the east side of the Divide, the ridge rebounds west
putting this area back under northerly flow. Thus new moisture can
slip through the passes and into the Upper Snake Plain, possibly
regenerating some of the low stratus. With inversions holding and
unless we loose some of the snow on the ground, will favor
temperatures showing little warming the next few days. RS

&&

.AVIATION...Low status in the Snake Plain will be persistent today
through perhaps the middle of the afternoon. Hoping the easterly
winds down the Snake Plain will help transport moisture away from
this area. Current VAD winds show westerly winds just above the
stratus much as the RAP 60agl winds depict. They gradually turn
northerly this afternoon. That may not help dissipate the stratus at
KIDA and KPIH very quickly. That should help the stratus move out of
KSUN this morning about 13Z, and KBYI about 17-18Z. RS

&&

.AIR QUALITY...Inversions continue to hold and reduce air quality.
Saturday night and Sunday morning, looking for development of more
persistent easterly winds and that could transport some of the low
stratus out of the Snake Plain. RS


&&

.PIH WATCHES/WARNINGS/ADVISORIES...
Freezing Fog Advisory until 10 AM MST this morning for IDZ017-
019>021-024.

&&

$$



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