Area Forecast Discussion
Issued by NWS Pocatello, ID

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FXUS65 KPIH 281548

Area Forecast Discussion
National Weather Service Pocatello ID
948 AM MDT Fri Apr 28 2017


Minor update to forecast to reduce sky conditions from the Magic
Valley into the Central Mountains for this afternoon based on
satellite trends.



.PREV DISCUSSION... /issued 310 AM MDT Fri Apr 28 2017/

SHORT TERM...Today through Sunday night.
Light snow has continued overnight in much of the southern and
eastern highlands and parts of the Snake River Plain. Brunt of
snow this morning should be in southern and eastern highlands with
snow expected to taper off in the Snake Plain where may see an
inch or so total mainly on grassy surfaces. Could see additional
half inch to 2 inches in southern and eastern mountains where may
see some snow covered roads early this morning over passes.
Temperatures will remain very cold today with high temperatures
around 10 degrees below normal. Expect drying conditions overnight
with dry conditions expected Saturday with temperatures warming
about 10 degrees to near seasonal norms. Another weak system will
push east Sunday and bring isolated to scattered rain and snow
showers to the region mainly in the mountains with snow levels
rising to around 7 thousand feet. Expect some strong north winds
to develop this afternoon in the 10 to 20 mph range in the Snake
Plain and southern highlands.

LONG TERM...Monday through Friday night. Not much change in the
pattern with minor waves in the northwest flow resulting in light
snow in the central mtns and eastern highlands thru Tue. Upper
ridging amplifies over the west...pushing precip out of the fcst
area and warming up the temps thru Thursday. Models begin to diverge
somewhat on Thu. The GFS breaks down the upper ridge on Thu while
the ECMWF maintains it. As a result...the GFS is quick to introduce
precip to the area while the ECMWF stays dry. Not convinced that a
ridge of that magnitude will give up so will stay with a
dry fcst for Thu. Both models seem to be in agreement with
increasing precip chances Fri...mainly in the mtns. Hedges

AVIATION...Convergence zone playing havoc with cigs/vis in the
Snake River Plain this morn due to snow. Conditions expected to
continue to ocnly impact all but KSUN...with improving conditions by
this aftn. Hedges



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