Area Forecast Discussion
Issued by NWS Pocatello, ID

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FXUS65 KPIH 242021
AFDPIH

Area Forecast Discussion
National Weather Service Pocatello ID
221 PM MDT SAT SEP 24 2016

.Discussion...Clouds and any lingering showers are expected to move
out of the state by this evening. That leaves a ridge of high
pressure beginning to build in tonight. Lighter winds, colder
morning temperatures and some areas of frost in the Snake Plain. An
advisory remains in effect 3-9 am Sunday. The high pressure ridge
will persist through Tuesday. Sunday night and Monday morning, NE
surface winds in the Snake Plain will begin to move some of the near
surface moisture down plain to the west. Forecast includes some
patchy fog Monday morning, but will have to see how much moisture is
left and how strong the winds are. The same NE winds should limit
heating Monday afternoon, therefore temperature forecasts are
conservative and a little under guidance. RS

&&

.AVIATION...Conditions continue to improve across eastern Idaho as
the low is now moving into the Northern Plains. It`s still breezy in
some areas this afternoon affecting KBYI, KPIH and KIDA to some
extent. Winds will decrease overnight and remain that way for
Sunday. The only concern through tomorrow morning will be the
formation of any fog due to all of the rainfall from the past couple
of days. At this time, we won`t mention it for any TAF sites BUT
it`s possible that we may have to add it later.  Keyes

&&

.Long Term...Tuesday through next Saturday. The blocking pattern over
the West begins to break down on Tuesday. We still expect warm and
dry conditions for that particular day. However that quickly changes
during the following 48 hour period. The low originally locked in
the block across the southwest will weaken and be picked up in
southwest flow. This will pulls whats left of the storm and moisture
into Idaho as early as Wednesday afternoon. The GFS actually keeps
most of this to our south vs the ECMWF, but it does look like we
should see some showers and possible daytime thunderstorms Wednesday
night and Thursday. As the pattern settles back into a slow moving
low across the western U.S. later in the week, we will see an
increasing chance of precipitation. The GFS and ECMWF differ on when
exactly we will see more showers, so we have some mention of
precipitation in every day for the moment. We will again see
temperatures slide back into the 50s and 60s by next weekend. Keyes

&&

.PIH Watches/Warnings/Advisories...
Frost Advisory from 3 AM to 9 AM MDT Sunday for IDZ020-021.

&&

$$



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