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 291934
AFDOTX

Area Forecast Discussion
National Weather Service Spokane WA
1234 PM PDT SAT AUG 29 2015

.SYNOPSIS...
A cold front will push through the Inland Northwest today and
bring high winds to the region. This will create a situation for
blowing dust with reduced visibility. There is the potential for
toppled trees and downed power lines as well. A cooler and
occasionally breezy regime with some shower activity will persist
through the next week.

&&

.DISCUSSION...
Early afternoon forecast update. Radar shows two distinct bands of
precip. One is extending just east of Lewiston and up to the
northeast toward Kellogg. We have had reports of gusts near 70 MPH
in the town Lewiston. This may be partial mountain wave activity
off of the Northeast Blue Mtns and stronger momentum transfer with
the showers. Gusts of this magnitude are expected to be temporary
within less of an hour and isolated in coverage. We have elected
to cover these stronger gusts with a Significant Weather Advisory
through 1:00 PM on top of the Windy Advisory already in effect.
Another Significant Weather Advisory may be needed if these
stronger gusts continue past 1:00 PM; however, much of these
stronger gusts are expected to be east of the area around this
time. Expect the potential for very strong winds to extend with
this band of showers across the Central Panhandle Mtns and on the
Camas Prairie.

The next batch of showers out ahead of the mid level cold front
can be seen on radar extending from Walla Walla to Republic. These
showers will increase in coverage to the east through the rest of
the afternoon. A few hundredths to a tenth of an inch of precip
can be expected from these showers. Best potential for closer to a
tenth of an inch is expected over the northern mtns. Much of the
basin may only just see some sprinkles from these showers. High
resolution models show a resurgence of stronger winds across the
western basin northward into the Okanogan Valley is expected as
this front passes. Sustained winds of closer to 25 to 30 mph with
gusts to between 40 to 50 mph can be expected with this second
surge. These wind speeds will still be strong enough to pick up
dust, but blowing dust may be more isolated now that some
rainfall has fallen. No updates to the Wind Advisory or Dust Storm
Warning at this time. /SVH

&&

.AVIATION...
18Z TAFS: The combination of smoke and blowing dust will
contribute to visibility problems that are difficult to forecast.
Look for frequent amendments through the early evening. Strong
west or southwest wind gusts are expected to max by early
afternoon right behind the cold front. The poorest blowing dust
visibility will likely occur at Moses Lake, Spokane, and possibly
Pullman due to dryland wheat fields upwind of these airports.
Visibility restrictions due to smoke in Lewiston should improve
through the day as wind disperses smoke. /GKoch

&&

.PRELIMINARY POINT TEMPS/POPS...
Spokane        81  53  68  52  71  53 /  50  20  80  10  10  10
Coeur d`Alene  81  52  64  49  71  52 /  50  20  80  10  20  20
Pullman        81  52  66  50  74  51 /  30  20  60  10  10  10
Lewiston       87  58  73  55  80  57 /  20  20  70  10  10  10
Colville       80  51  70  50  70  50 /  50  30  90  20  40  20
Sandpoint      80  50  62  48  69  49 /  40  20  90  20  40  40
Kellogg        79  49  60  47  71  48 /  40  30  90  20  20  20
Moses Lake     79  55  74  54  76  55 /  30  40  80  10  10  10
Wenatchee      75  56  71  55  74  55 /  10  70  40  10  20  20
Omak           76  52  72  51  73  52 /  50  70  50  20  20  30

&&

.OTX WATCHES/WARNINGS/ADVISORIES...
ID...Red Flag Warning until 7 PM PDT this evening for Northern and
     Central Idaho Panhandle (Zone 101).

     Wind Advisory until 8 PM PDT this evening for Central Panhandle
     Mountains-Coeur d`Alene Area-Idaho Palouse-Lewis and
     Southern Nez Perce Counties-Lewiston Area-Northern
     Panhandle.

WA...Red Flag Warning until 7 PM PDT this evening for East Washington
     Central Cascade Valleys (Zone 677)-East Washington
     Northeast (Zone 686)-East Washington Northern Columbia
     Basin (Zone 673)-East Washington Okanogan Highlands (Zone
     687)-East Washington Okanogan/Methow Valleys (Zone 684)-
     East Washington Palouse and Spokane Area (Zone 674).

     Wind Advisory until 8 PM PDT this evening for East Slopes
     Northern Cascades-Lower Garfield and Asotin Counties-
     Northeast Blue Mountains-Northeast Mountains-Okanogan
     Highlands-Okanogan Valley-Wenatchee Area.

     DUST Storm Warning until 5 PM PDT this afternoon for Moses Lake
     Area-Spokane Area-Upper Columbia Basin-Washington Palouse-
     Waterville Plateau.

&&

$$


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