Area Forecast Discussion
Issued by NWS Spokane, WA

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FXUS66 KOTX 290914
AFDOTX

Area Forecast Discussion
National Weather Service Spokane WA
214 AM PDT FRI APR 29 2016

.SYNOPSIS...
A cooler system will bring increased cloud cover and areas of rain
across Eastern Washington and north Idaho today. High pressure
will build in Saturday through Monday resulting in a warming
trend. Temperatures early next week will climb to above normal
once again...with highs mainly in the mid 70s to lower 80s. High
pressure will move east for the middle of next week allowing
increased moisture to move in from the south...resulting in a
chance for showers and thunderstorms.


&&

.DISCUSSION...
Today through Saturday...Two areas of low pressure will converge on
the Inland Northwest today bringing widespread precipitation to much
of the forecast area. An upper low spinning over western Montana
will drift west to the central panhandle of Idaho today keeping the
threat of precipitation over the eastern half of the forecast area.
An upper trough will approach from the northwest today. The
interaction of these two features will result in a broad area of low
pressure and at least a chance of showers for the east slopes and
the basin. As the Pacific trough pushes farther inland, stronger
northwest flow will dominate, downsloping and drying out the basin
tonight and pushing precipitation into the Idaho panhandle.
Locations in extreme eastern WA and the panhandle could see a
quarter inch to a half inch from this combined system. Enough to
cause rises on area creeks and streams but not enough to push any of
the mainstem rivers near flood stage. The Cascade gap valleys will
see elevated winds but not strong enough for any wind highlights.
High temperatures today will be seasonably cool with all the
precipitation expected. A warming trend will start on Saturday as
shower coverage will diminish substantially. Expect 70s for
the western valleys and 60s for the eastern zones. /Kelch

Saturday night through Thursday...The end of the weekend will
feature a building upper level ridge which will dry out the
forecast area by Sunday morning with the last vestiges of mountain
showers tapering off over the Idaho panhandle Saturday evening.

This ridge will hold sway over the region leading to pleasant
conditions with temperatures climbing back above normal Sunday and
Monday with dry conditions and plenty of sun through out the
region.

After Monday the ridge axis will move eastward and leave the
forecast area under increasingly moist southerly flow through the
rest of the work week. A slow moving and weak Pacific cold front
will approach the region Tuesday and may drift lazily through from
west to east or become hung up over the forecast area Wednesday
and Thursday. The main weather issues associated with this
evolution will be a leveling off of temperatures on Tuesday and a
moderation but still above normal Wednesday and Thursday...and an
increasing chance of showers and thunderstorms as the moisture
feed is exploited into lift along the frontal surface. There will
be no organized coherent storm systems in this flow...but minor
transient waves in this southerly flow will act to kick off random
hit and miss showers and storms each afternoon and evening...with
some remnants producing minor showers through the overnight
hours. While the mountains ringing the Columbia Basin will be
favored for the lion`s share of activity...the entire forecast
area will be subject to at least a small chance of showers each
day especially on Wednesday and Thursday. /Fugazzi

&&

.AVIATION...
06Z TAFS: The region is under a broad upper level trough of low
pressure. A weak circulation over SW MT will increase moisture
over the region. Rain will increase overnight in areal coverage.
Expect MVFR cigs and vis possible at the KGEG, KSFF, KPUW and
KCOE TAF sites after 09Z with moderate rain possible at times
during the afternoon. Winds will increase in the afternoon across
the Cascade gaps and into KEAT and KMWH. Mountain obscurations
will occur over the next 24 hrs as this system moves through.



&&

.PRELIMINARY POINT TEMPS/POPS...
Spokane        55  42  67  46  73  49 /  80  40  20  10   0   0
Coeur d`Alene  54  40  67  43  74  45 /  90  50  30  10   0   0
Pullman        53  40  63  42  71  45 / 100  40  20  10   0   0
Lewiston       60  45  68  46  76  49 /  80  30  20  10  10   0
Colville       60  40  72  42  78  43 /  70  40  10  10   0   0
Sandpoint      54  38  65  39  72  40 /  80  50  30  20   0   0
Kellogg        51  38  62  39  70  41 / 100  50  30  20   0   0
Moses Lake     64  42  75  44  79  46 /  40  20   0   0   0   0
Wenatchee      64  45  74  49  79  52 /  30  20   0   0   0   0
Omak           66  42  74  45  78  48 /  50  20   0   0   0   0

&&

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

$$



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