Area Forecast Discussion
Issued by NWS Pocatello, ID

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FXUS65 KPIH 150826

Area Forecast Discussion
National Weather Service Pocatello ID
226 AM MDT Fri Sep 15 2017

.SHORT TERM...Today through Sunday.
Cold upper trof working through Idaho with fairly widespread rain
Thursday night and continuing today. Associated cold front working
through state as well with 15 to 20 mph winds possible up the
Snake River Plain. Snow levels will drop to around 7 to 8 thousand
feet overnight and elevations above that in central mountains and
Upper Snake River Highlands may see 1 to 3 inches or so.
Temperatures will be significantly colder today and Saturday with
highs in the 40s and 50s mainly throughout the region. Expect
Saturday to see drying west to east with most precipitation along
the Wyoming border. Sunday should see warming and dry conditions
with highs back into the 70s in the Snake Plain and into the 60s
in the mountains.

.LONG TERM...Monday through Friday.
Another upper trof will approach Monday and bring the threat for
precipiation as well. Temperatures will be close to normal Monday
then drop to well below normal once again with again a threat for
high elevation snowfall by Monday night. The GFS keeps a series of
cold systems pushing through Idaho through next week with
continued chances of low elevation rain and high elevation snow
showers and very cold temperatures Tuesday through Friday.


.AVIATION...An upper level trough was noted advancing into the
region early this morning with accompanying showers throughout the
Snake River Plain and SE mountains. Numerical models show the trough
advancing slowly through SE Idaho and WRN Montana today and tonight
with attending rain and higher mountain snow showers impacting
mainly the CNTRL and NE Idaho mountains while a dry slot and
accompanying gusty winds push east into the Snake Plain and SRN
mountains this afternoon. We have been observing temporary MVFR CIGS
with showers early this morning and this is expected to continue
until about mid-morning with some improvement within the Snake River
Plain and then sometime this evening at KDIJ. KSUN is expected to
remain on the drier side of the precipitation onset anticipated for
the CNTRL mountains today and tonight. Huston

.FIRE WEATHER...It has been a fairly wet night for the Snake River
Plain and southern highlands, with the wet pattern expected to
transition north across the CNTRL and NE mountains this afternoon
and tonight as a low pressure trough gradually migrates through the
region. Areas of showers and higher mountain snowfall are
anticipated for the CNTRL and NRN mountains with a dry, colder and
breezy west flow spreading across the Snake Plain this afternoon.
Clearing skies and gradually warmer daytime highs are expected
Saturday and Sunday as the next upstream Pacific storm system loads
up off the NW coast. The associated moisture and colder temperatures
accompanying this next system will spread over the region Monday
afternoon/night and continue through Tuesday evening. A third system
looks to follow late Wednesday into Thursday keeping temperatures
seasonably cool with periods of valley rain and higher mountain
snow. Huston



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