Area Forecast Discussion
Issued by NWS Spokane, WA

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 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
000
FXUS66 KOTX 260601
AFDOTX

Area Forecast Discussion
National Weather Service Spokane WA
1000 PM PST TUE NOV 25 2014

.SYNOPSIS...
Mild and wet conditions will continue through Thursday. Snow
levels will be on the rise tonight...but expect some
accumulations for the areas near the Canadian border through
morning. Thanksgiving will be breezy...wet and continued warm.
Then a colder weather pattern is expected for the holiday weekend
with the mountains receiving several rounds of snow. Snow levels
will fall to valley floors by the weekend.



&&

.DISCUSSION...
Evening update: Very messy and tricky weather pattern. The colder
air trapped near the lee of the Cascades, especially the Methow
and Okanogan Valley, has been harder to get out of those crevices
than coins that fell into the couch cushions. So I have been
playing catch up. Earlier this evening reports of snow in this
region have been in the 4 to 8 inch range, with local amounts near
a foot in place such as Mazama deep in the Methow valley closer to
the Cascades and near Molson, around 4000 feet. Recent reports and
a look at area webcams, including around Oroville going toward the
Canadian border show some rather sloppy/white conditions. SSome
snow has also been reported and seen on cameras about the
Waterville Plateau, near and north of the city of Waterville.

I expanded the areal coverage of the Winter Weather Advisory which
was in place here to include more of the Methow and Okanogan
Valley. The snow should continue to impact the region through the
next several hours, then begin to dissipate in intensity and
coverage overnight into Wednesday morning. So continue to look
for some snowfall through about midnight to 2 am, before
dissipating around the 2-4 AM hour.

Precipitation elsewhere has been in and out, but most of the
newest guidance keeps some moderate chance going across east-
central and northeast WA and north ID through at least the early
overnight, before the focus starts to retreat north and east into
the Panhandle by Wednesday morning. I decreased overall PoPs
across the Basin through the Spokane/C`dA area southward. However
they still remain in the lower likely category in that
Spokane/C`dA area and higher Palouse.

Overnight lows will be tricky. Most places may have already
reached their lows for the night, with many models suggesting
temperatures will remain steady or slowly rise overnight
especially away from the northern lee of the Cascades and
sheltered northern valleys. /J. Cote`


&&

.AVIATION...
06Z TAFS: A warm front will gradually lift into the region,
eventually overwhelming the colder air at the surface. Lookf or
periods of rain and snow toward the GEG to COE...PUW and in the
vcnty of EAT/LWS through the night, with the threat waning toward
12Z at most sites. The threat will linger longer near COE. In this
set-up look for IFR/LCL MVFR conditions, with stratus and fog. The
fog may be locally dense in spots, with the best confidence near
GEG at this time. Conditions are expected to improve somewhat
after 16-19Z, with cigs lifting slightly toward high IFR/MVFR
conditions around the eastern TAF sites and MVFR/VFR conditions
elsewhere.  /J. Cote`



&&

.PRELIMINARY POINT TEMPS/POPS...
Spokane        35  48  42  49  40  45 /  70  40  30  20  30  70
Coeur d`Alene  35  48  41  47  40  44 /  70  80  50  50  30  80
Pullman        40  54  44  52  42  48 /  70  20  20  10  30  80
Lewiston       44  59  47  55  45  52 /  60  10  10  10  30  70
Colville       36  45  39  45  38  42 /  80  80  60  40  40  70
Sandpoint      33  44  38  43  37  41 /  70  80  70  60  60  80
Kellogg        34  43  40  42  38  39 / 100  90  60  60  60  90
Moses Lake     38  54  44  54  40  51 /  20  10  10  10  20  30
Wenatchee      40  51  42  50  41  46 /  40  10  20  10  40  30
Omak           32  44  38  44  35  41 /  80  40  30  20  50  50

&&

.OTX WATCHES/WARNINGS/ADVISORIES...
ID...Winter Weather Advisory until 10 AM PST Wednesday for Northern
     Panhandle.

     Winter Weather Advisory until 4 AM PST Wednesday for Central
     Panhandle Mountains.

WA...Winter Weather Advisory until 10 AM PST Wednesday for Northeast
     Mountains.

     Winter Weather Advisory until 4 AM PST Wednesday for East Slopes
     Northern Cascades-Okanogan Highlands-Okanogan Valley.

&&

$$




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