Area Forecast Discussion
Issued by NWS Spokane, WA

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FXUS66 KOTX 031139
AFDOTX

Area Forecast Discussion
National Weather Service Spokane WA
339 AM PST TUE MAR 3 2015

.SYNOPSIS...
A weather system will exit the region today, diminishing the
threat of snow showers and gusty winds. Much colder air will move
in behind this system, with temperatures well below average for
the middle of the week. A dry period, with moderating temperature
will follow for the end of the week.


&&

.DISCUSSION...
for this morning...High pressure is building in the eastern
Pacific while a low pressure system digs into Idaho and Montana.
This puts the inland northwest in a dry northerly flow. Some
remnants of the vigorous short wave from last evening as well as
up-sloping flow will keep some low end chance for snow showers
across the Blue mountains and the Camas Prairie early this
morning. Another weak wave is also dropping through BC this
morning. This wave is almost non-existent on models but can be
seen on water vapor imagery. Not much in the way of moisture with
this feature, but enough to hold onto some low end pops for the
northeast mountains early this morning. The northerly surface
pressure gradient is slowly decreasing. There are still some gusty
winds spilling out of the Okanogan valley into the Waterville
Plateau and the basin, but these are expected to subside through
the morning hours.

For this afternoon through Wednesday night...The ridge of high
pressure will ease into the Pacific Northwest tonight and
Wednesday...then flatten late Wednesday and Wednesday night as
another Pacific short wave over tops the ridge. Dry conditions are
expected from this afternoon through Wednesday night. 850
temperatures will bottom out this morning and this afternoon, then
rebound tonight and Wednesday. Temperatures will be 8-12 degrees
below normal through Wednesday morning, before rebounding
Wednesday afternoon to near normal. Expect morning lows ranging
from the lower teens to lower 20s both mornings. Highs will be in
the mid 30s to mid 40s today, then mid 40s to lower 50s on
Wednesday. Winds will be variable and under 10 mph. Tobin

Thursday through Friday night...It looks like the 00Z run of the
ECMWF blinked. Up until this point the EC had been holding firm
onto the trough solution that would bring some precipitation to
the region while the GFS was consistently keeping most precip to
our northeast. Now the EC has trended toward the drier GFS
solution. For now we will keep some low end PoPs in the Idaho
panhandle since the GFS shows a shortwave impulse clipping the
northern panhandle Friday night. Snow levels will be around
3500-4500 ft so the passes could see some light accumulations. The
remainder of the forecast area should remain dry for the end of
the work week. Cold northerly flow will transition to a more
northwest trajectory so temperatures will start to trend closer to
seasonal normals. By Friday night, some of the southern valleys
could remain above freezing overnight.

Saturday through Monday...The ridge of high pressure will remain
over the region, fostering dry conditions with temperatures on a
warming trend. We may see some springlike temperatures for the
weekend. Some moisture will ride along the ridge so there is a low
possibility of some showers but the more likely scenario will be
an increase in mid and high clouds for the end of the weekend and
into the start of next week. /Kelch

&&

.AVIATION...
12Z TAFS: A few snow showers may hang around the Camas Prairie
through 14z...but these should be on the decrease. High pressure
will strengthen off the coast and put the region in a cool but
stable and dry north-northwest flow. Expect mainly sunny days and
cool clear night with VFR conditions at all TAF sites. Winds will
be northerly and under 10kts. Tobin


&&

.PRELIMINARY POINT TEMPS/POPS...
Spokane        37  17  43  23  48  28 /   0   0   0   0   0   0
Coeur d`Alene  37  15  44  22  49  26 /   0   0   0   0   0   0
Pullman        37  18  44  26  51  32 /   0   0   0   0   0   0
Lewiston       40  20  48  27  54  34 /  10   0   0   0   0   0
Colville       41  16  45  22  50  25 /   0   0   0   0   0  10
Sandpoint      34  13  41  21  45  25 /   0   0   0   0   0   0
Kellogg        32  14  40  23  46  28 /   0   0   0   0   0   0
Moses Lake     44  21  49  26  53  32 /   0   0   0   0   0   0
Wenatchee      45  24  50  31  54  34 /   0   0   0   0   0   0
Omak           45  20  48  25  52  28 /   0   0   0   0   0   0

&&

.OTX WATCHES/WARNINGS/ADVISORIES...
ID...None.
WA...None.
&&

$$




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