Area Forecast Discussion
Issued by NWS Pocatello, ID

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FXUS65 KPIH 101515

Area Forecast Discussion
National Weather Service Pocatello ID
815 AM MST Sun Dec 10 2017

.SHORT TERM...Today through Wednesday. A quick update this morning
to expire the Dense Fog Advisory for the Magic Valley and Lower
Snake River Plain and extend the Air Quality Advisory for Franklin
county. See previous discussion below. Huston

Satellite trends show fog clearly along the I-86 corridor between
Pocatello and Burley with some also in the Cache Valley. Yesterday,
fog/stratus covered the entire Snake Plain. However, it is more
dense this morning. Thus we have a dense fog advisory through 8 AM.
The surface inversion will likely remain in place through the
period, so overnight fog/stratus will continue to be the norm.

.LONG TERM...Wednesday night through Sunday. A high pressure ridge
will keep inversion conditions in the lower valleys and Snake Plain
through next Thursday night. The blocking ridge is expected to break
down as early as Friday. Models this morning have differed on
handling of the disturbance that comes into Idaho around Friday
afternoon, even splitting the energy down the coat of California.
Therefore, will not make any significant changes to the extended
forecast at this time. RS

.AVIATION...KSUN and KDIJ have remained free of the fog and stratus
and should continue to do so. KIDA, KPIH and KBYI are in the soup,
with areas of dense freezing fog along the Interstate 84/86 corridor
between Pocatello and Burley. There is some easterly down plain
winds this morning, but it is difficult at night to tell just how
effective it might be at transporting some of the low stratus to the
west. RS

.AIR QUALITY...Inversions continue to hold and reduce air quality,
particularly for Franklin County where an Air Stagnation Advisory
remains in effect. There is some easterly or down plain winds this
morning that could be working to transport some moisture towards the
west side of the state. Very difficult to tell how much success
there is this morning. It probably will not get rid of the inversion
completely. RS


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