Area Forecast Discussion
Issued by NWS Pocatello, ID

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29
337
FXUS65 KPIH 140844
AFDPIH

Area Forecast Discussion
National Weather Service Pocatello ID
244 AM MDT Sat Oct 14 2017

.SHORT TERM...Today through Mon night. Precipitation associated
with cold front currently over the eastern half of the forecast
area should end by at least the mid-afternoon today. Wind will be
decreasing during the morning as the front continues its eastward
movement. This has left some standing water, but it will get a
chance to evaporate some during the afternoon. So do not expect
any dense fog, but patchy fog in the valleys certainly seems
reasonable for late tonight and Sun morning. Warming and
evaporation continues and would not expect fog to return for Sun
night/Mon morning. High pressure will continue to build on Mon, so
light wind and warming to above normal temperatures will also
continue. The main thing is the cold temperatures, with many in
the teens and low 20s, and the precipitation wrapping up in the
Snake River plain and eastern highlands this morning. Messick

.LONG TERM...High pressure peaks on Wednesday before it slowly
breaks down in response to the approach of a low. The low is now
expected to cross through the forecast area on Fri/Fri night-
slightly slow than previous thinking. After this feature moves
into eastern Idaho, guidance diverges strongly on the timing up
subsequent upstream features, making timing of anything for next
weekend very much uncertain. Have tried to split the difference
between the slower and wetter ECMWF and GFS. Messick

&&

.AVIATION...A low pressure system will exit east into Wyoming by
noon today. Model time sections indicate that we will continue to
wrestle with MVFR/IFR CIGS and VIS at KPIH, KIDA and KDIJ at least
through mid-morning before the drier NW flow aloft spreads through
the remainder of the region. Dry VFR conditions are expected at all
the terminals thereafter. Huston

&&

.FIRE WEATHER...A low pressure trough and attending precipitation
were working east across the region early this morning and are
expected to exit east into Wyoming by noon today as a drier NW flow
overspreads the region. Numerical models continue to show a ridge of
high pressure gradually expanding north across the region Sunday and
Monday for dry and warmer conditions. For now, the models show a
disturbance shifting east through Canada Tuesday night and Wednesday
resulting in widespread rain and higher mountain snow across the
Idaho Panhandle while remaining just north of the Salmon Breaks.
Otherwise, the previously advertised incoming low for Thursday has
slowed and is now expected to advance inland late Thursday night
into Friday. Out ahead of this system, temperatures are expected to
run well above normal for SE Idaho Thursday before the onset of
precipitation and colder temperatures with the incoming low Friday.
Huston

&&

.PIH WATCHES/WARNINGS/ADVISORIES...
None.

&&

$$



USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.