Special Weather Statement, NWS Pocatello, ID

Area Forecast Discussion
National Weather Service Pocatello ID
205 PM MDT Wed Aug 5 2020

.SHORT TERM...Today through Friday night. High pressure ridging
moves east today allowing for southwest flow bringing
temperatures 5 to 10 degrees above normal today. Isolated
thunderstorms are possible late in the afternoon into the evening,
mainly over our western areas, the Central mountains, and the
Montana Divide. Gusty outflows of up to around 40 to 50 mph are
possible late this afternoon and early this evening with these
showers and thunderstorms. Thursday afternoon into the early
evening expect isolated to scattered showers and thunderstorms
showers along a frontal boundary moving through. Scattered
thunderstorm coverage will be mainly in the Central
mountains/Lemhi and Lost River ranges where Red Flag warnings are
in effect. Expect wind gusts of 20 to 35 mph as well tomorrow.
Also, critical relative humidity is expected tomorrow for the
Snake River plain and the Southeast/Caribou Highlands where Red
Flag warnings are also in effect. Temperatures will drop to
around 2 to 4 degrees above normal on Thursday. Friday will be
mostly dry with just lingering isolated showers and thunderstorms
mainly over the Island Park area. Temperatures will drop to near
normal to slightly below normal Friday.
Wyatt

.LONG TERM...Saturday through Wednesday night. Expect overall dry
conditions and breezy to moderate winds Saturday and Sunday with
a system passing well north of the area. Models differ on when the
next thunderstorms will be. The GFS model shows afternoon
thunderstorms Tuesday and Wednesday, while the ECMWF model shows a
weak chance of thunderstorms on Wednesday afternoon. Temperatures
will be near normal to slightly above normal this weekend into
Monday. Temperatures then look to drop to near normal by next
Tuesday and slightly below normal by Wednesday.
Wyatt

&&

.AVIATION...A few clouds advancing northward across the forecast
area today, another surge this evening will usher in some isolated
thunder to BYI, PIH, and SUN. DIJ may see some activity as well
around midnight. Otherwise, we wait for the approaching cold front
late tomorrow morning and expect to see winds increasing towards the
end of the forecast period.
Hinsberger

&&

.FIRE WEATHER...A RED FLAG WARNING is in effect for tomorrow
afternoon/evening. In the north, Zones 475 and 476 are under a
threat of scattered thunderstorms that will trigger along a surface
cold front. There will likely be a mix of wet and dry thunderstorms
in that area. Further south, zones 410, 413 and 425 will be in
critical fire weather due to winds and low RH as the southern end of
the passing cold front moves through. Additionally, Haines indices
start off at 6 tomorrow afternoon. Pressure gradient remains tight
across the region in wake of the front, so we may see some strong
winds but we'll also be seeing some slightly higher humidity. Over
the weekend, there is low to moderate confidence of winds and RH
creating critical fire conditions in the Snake Plain, particularly
around the Arco Desert.
Hinsberger

&&

.PIH WATCHES/WARNINGS/ADVISORIES...
Red Flag Warning from 3 PM to 9 PM MDT Thursday for IDZ410-413-
425.

Red Flag Warning from noon to 9 PM MDT Thursday for IDZ475-476.

&&

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