Weather Service Report


128 
FXUS65 KPIH 232055
AFDPIH

Area Forecast Discussion
National Weather Service Pocatello ID
155 PM MST Sun Feb 23 2020

.DISCUSSION...
A frontal system is poised to sweep through the area later this
evening and into the overnight hours bringing with it some gusty 
winds, snow and rain although it will be very brief. Hi-res model
guidance continues to bring a line of snow showers into the 
Central Mountains around 5PM or so. Though the snow will move 
through rather quickly it will likely be heavy at times with 
blowing snow due to strong winds making visibility very low, 
possibly near white-out conditions. Between now and Monday
morning, expect 1 to 3 inches of snow for the Northern Central 
mountains, Eastern Highlands, Teton Valley, Big Hole mountains, 
Caribou range and the Wasatch mountains. 

Across the lower elevations impacts from this line don't look to have
nearly as much of an impact as a 1-2 hour period of rain and/or 
snow is likely including a slight chance for a very brief period 
of freezing rain around Idaho Falls and Blackfoot as the front
moves through but again overall impacts should be limited. Precip
type will likely be rain across the Magic Valley with a mix 
expected in and around Pocatello before briefly changing over to 
snow with little to no accumulation. Closer to Idaho Falls and
Rexburg snowfall accumulations would likely be a half inch or
less. As the moisture departs to the east, some light snow 
showers will linger into the day Monday along and near the Wyoming
border but accumulations should be fairly light.

As the week progresses, models build a high pressure ridge over 
the region allowing temperatures to begin to moderate. A very weak
shortwave will swing through Wednesday increasing cloud cover some  
and perhaps allowing for some scattered snow showers across the 
Island Park area but much of eastern Idaho is expected to remain 
dry. Into the weekend, ridging re-establishes itself across the 
area as we continue with dry conditions and moderating temperatures.
Temperatures will slowly rise throughout the week with highs in 
the 40s, possibly hitting 50 in the Snake Plain as we get into the
first half of the weekend. Late Saturday and into Sunday, model 
shows a trough across the Pacific NW digging into Idaho 
potentially bring some rain and snow for late next weekend. 


&&

.AVIATION...
VFR conditions to prevail for a few more hours this afternoon
until a frontal boundary arrives. This front will temporarily
degrade VIS conditions, bring LLWS and increase winds behind the
front. CIG are expected to remain mostly VFR but may drop IFR at
SUN and DIJ. Expect the boundary to arrive late this evening with
improving conditions expected near or after midnight. ND

&&

.PIH WATCHES/WARNINGS/ADVISORIES...
Wind Advisory from 7 PM this evening to 2 AM MST Monday for 
IDZ055>059.

&&

$$

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Western Regional Climate Center, wrcc@dri.edu