Area Forecast Discussion
Issued by NWS Spokane, WA

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FXUS66 KOTX 302144
AFDOTX

Area Forecast Discussion
National Weather Service Spokane WA
244 PM PDT Thu Mar 30 2017

.SYNOPSIS...
Breezy winds across central Washington will decrease this evening.
Showers for southeastern WA and the ID Panhandle will be on the
decrease as well. The weather on Friday will be mild and dry with
light winds. The weekend and early next week will feature average
temperatures and scattered light showers, mainly over the
mountains.


&&

.DISCUSSION...
Tonight through Friday Night: Elongated trough will continue to
push into the desert southwest. There is enough instability this
afternoon for widely scattered showers to develop across portions
of E WA and N ID. Expect these showers to continue through the
early evening and then diminish with the setting sun. North to
northwesterly winds will continue through the evening hours as the
surface pressure gradient remains tightly packed across central
WA. Generally through the night we will see decreasing showers and
clouds. There is a threat of fog and low clouds forming overnight
into Friday morning. The fog would likely be across the valleys of
NE WA and north ID as well as some of the Cascade valleys. Friday
will be a day unlike we have seen in awhile! The ridge will nose
into the area with mostly sunny skies to start the day. Clouds
will increase in the afternoon, but given lack of instability it
should just be some flat cu and/or cirrus. The ridge will flatten
Friday night ahead of the next weather disturbance. Some high
level clouds will increase through the night and overnight there
will be a slight chance of showers along the Cascade crest.
/Nisbet

Saturday through Wednesday: A weak trough will push through the
region as the ridge flattens and bring light rainshowers to the
Cascades and Idaho Panhandle through the Sunday. Rain amounts will
not be significant with only a few hundreths over the weekend.
Models have been on a drying trend from the previous runs leading
to the decrease to precip amounts and limiting to the Cascades and
Idaho Panhandle. By early Monday, a ridge begins to build into
the region and rain chances diminishes across the region. The
region can expect fairly dry and mild weather through Wednesday.

Thursday through Friday: The ridge shifts east and a couple of
systems will push through the region bringing more widespread
rainshowers to the region. The first is expected mid Thursday and
expected to impact the Cascades and Idaho Panhandle. Model
agreement is fairly good on the timing and amounts. The more
robust system is expected Friday and into the weekend.
Isolated thunderstorms are possible but the confidence is low
enough to not mention in forecast.

Temperatures for the period will mild and on the the cool side of
normal. The highs will be in the mid 50s to low 60s. The lows
will hover in the mid 20s to 30s. /JDC

&&

.AVIATION...
18Z TAFS: Widely scattered showers over eastern WA and the ID
Panhandle will continue through the aftn hours. Airports with a
decent shot of showers this afternoon are Colville, Sandpoint,
Bonners Ferry, Coeur d`Alene and Pullman. The strongest cells
will have the potential to produce brief heavy rain and soft hail
(up to pea size) in the 20z-01z time frame. Showers should
diminish quickly this evening with the loss of afternoon heating
and dry north advection through the evening. There is the
potential of some low clouds or fog early Fri morning, but
confidence isn`t high. Put in a SCT low cloud deck for GEG-SFF-
COE-LWS, and BKN for PUW where confidence is a bit higher.

&&

.PRELIMINARY POINT TEMPS/POPS...
Spokane        33  56  37  56  36  52 /  10   0   0  20  10  10
Coeur d`Alene  33  55  36  54  34  51 /  20   0   0  30  20  20
Pullman        32  52  36  55  37  51 /  30   0   0  20  20  10
Lewiston       35  56  38  60  39  56 /  20   0   0  10  20  10
Colville       30  56  35  55  34  52 /   0   0   0  20  10  10
Sandpoint      31  54  33  51  33  49 /  20   0   0  40  20  20
Kellogg        33  52  34  50  34  47 /  40   0   0  30  30  20
Moses Lake     33  60  39  63  37  58 /   0   0   0  10  10  10
Wenatchee      34  57  38  58  36  54 /   0   0   0  20  10  10
Omak           29  56  37  58  35  54 /   0   0   0  20  10  10

&&

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

$$



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