Area Forecast Discussion
Issued by NWS Spokane, WA

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FXUS66 KOTX 311233
AFDOTX

Area Forecast Discussion
National Weather Service Spokane WA
533 AM PDT TUE MAY 31 2016

.SYNOPSIS...
High pressure will build over the Inland Northwest today with warm
and dry weather. A dry cold front will arrive late Wednesday
producing breezy conditions Wednesday evening through Thursday.
Afternoon temperatures next weekend will feel like summer has
arrived with many areas reaching 90 degrees or more for the first
time of the season.

&&

.DISCUSSION...
Today through Wednesday night: High pressure will bring mostly dry
and warmer weather to the Inland Northwest again today. A weak
warm from will brush across the northern Cascades into BC this
afternoon with increased cloud cover and isolated mountain
showers. Little else in the way of precipitation is anticipated
across the remainder of the area. Daytime highs will warm about 5
degrees over yesterday. Winds will be light as they become more
southerly this afternoon and evening. Mild temperatures will
continue tonight into Wednesday with a few degrees of warming
expected. Then a relatively weak and somewhat dry cold front will
ripple through the area. Expect more mid and high level clouds
with a small chance of mountain showers mainly near the Canadian
border. Low level winds will increase out of the west-southwest
Wednesday afternoon and evening from the Cascades and across the
Columbia Basin. Expect sustained winds 10 to 20 mph with gusts to
30 mph. The winds will gradually taper off Wednesday night in all
but the Cascade valleys. /rfox.

Thursday through Tuesday: Thursday will be the cooler day before
a substantial warmup by the weekend. The biggest challenge through
Thursday will be determining the areal coverage of pcpn chances.
The frontal boundary moving through Ern Wa and N Idaho does not
have a whole lot of dynamical support to generate a significant
pcpn threat... and the sub-cloud dry lyr is moderately deep. Sfc-
based instability is modest at best. This is not unlike what we
saw on last night`s shift, so we essentially made little in the
way of meaningful changes to the fcst for Thursday. Strong upper
ridging then re- establishes itself over the Pac Nw into the
weekend with 850mb temperatures in the mid 20`s C... sufficient
under normal summer clear skies to produce close to triple digit
high temps. But all model guidance also shows high cloud cover
increasing, with the ECMWF even generating late day convective
pcpn Sunday. Even so, we kept very hot temps in the fcst Saturday
through Tuesday. Isolated mainly mountain showers/thunderstorms
Thursday and again Mon and Tue.bz

&&

.AVIATION...
12Z TAFS: High pressure building across the Inland NW through
today and tonight will promote mostly dry conditions, save for a
slight risk for showers near the northern Cascades toward
afternoon. The TAF sites will see periodic middle to high clouds,
which should thicken some from the west tongihty as the ridge
axis starts to shift east and front approaches the Pacific Coast.
Winds are expected to light and diurnal. /rfox

&&

.PRELIMINARY POINT TEMPS/POPS...
Spokane        76  52  81  56  75  55 /   0   0   0   0  10   0
Coeur d`Alene  75  47  80  54  75  54 /   0   0   0   0  10   0
Pullman        74  46  79  52  73  52 /   0   0   0  10  10   0
Lewiston       80  52  85  57  82  58 /   0   0   0  10  10   0
Colville       79  48  83  52  79  50 /   0   0   0  10  10   0
Sandpoint      72  43  78  51  73  51 /   0   0   0  10  10   0
Kellogg        73  45  78  50  72  49 /   0   0  10  10  10   0
Moses Lake     82  50  87  58  82  55 /   0   0   0   0   0   0
Wenatchee      82  56  84  59  80  58 /   0   0   0   0   0   0
Omak           81  50  84  54  81  55 /   0   0   0  10   0   0

&&

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

$$



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