Area Forecast Discussion
Issued by NWS Spokane, WA

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042
FXUS66 KOTX 090550
AFDOTX

Area Forecast Discussion
National Weather Service Spokane WA
950 PM PST MON FEB 8 2016

.SYNOPSIS...
Strong high pressure will persist into Wednesday. Dry and mild
conditions are expected for the first half of the week. A more
progressive and unsettled pattern will return late this week
bringing a chance of light rain Thursday in the Cascades and over
the rest of the region Friday through the weekend.


&&

.DISCUSSION...
Forecast challenge tonight is the placement of fog as the region
remains under a strengthening ridge. Surface observations this
evening show relative humidities reaching 100 percent confined to
locations in the immediate vicinity of water bodies. This is
where fog formed this morning and the same scenario will likely be
repeated overnight. The persistent ridge and strengthening low
level inversions has prompted the issuance of an Air Stagnation
Advisory for much of eastern WA through Saturday. /Kelch

&&

.AVIATION...
06Z TAFS: A strong ridge of high pressure will remain over the
forecast area through the week with much drier air moving into the
region. For tonight through Tuesday clearing skies and light
northeast to southeast winds will allow good radiational cooling
and the development of strong morning inversions. This in turn
typically will result in the formation of fog and stratus. The
drier air and easterly gradient will keep that in check somewhat.
For KGEG/KSFF fog and stratus will likely form late tonight and
linger through the morning. So VFR/MVFR conditions will drop to
IFR/LIFR cigs/vsby 14z-20z before clearing in the afternoon.
Confidence is only low to moderate for LIFR conditions. KCOE-
KPUW-KLWS will remain VFR...however some ground fog may form early
in the morning near KCOE. The easterly gradient will allow the
moisture to pile up along the east slopes of the Cascades. The
best chance for IFR/LIFR vsby/cigs will be at KMWH- KEAT between
08-18z but again confidence is only moderate with the amount of
dry air in place. /EK


&&

.PRELIMINARY POINT TEMPS/POPS...
Spokane        30  49  31  46  35  48 /   0   0   0   0  10  10
Coeur d`Alene  31  51  31  48  32  49 /   0   0   0   0  10  10
Pullman        36  55  35  54  38  54 /   0   0   0   0  10  10
Lewiston       37  57  38  57  39  58 /   0   0   0   0  10  10
Colville       27  43  31  43  33  44 /   0   0   0   0  10  20
Sandpoint      27  47  31  44  31  44 /   0   0   0  10  10  20
Kellogg        30  51  31  48  33  50 /   0   0   0   0  10  10
Moses Lake     29  49  31  47  36  49 /   0   0   0   0  10  10
Wenatchee      30  43  32  44  36  45 /   0   0   0   0  10  20
Omak           20  41  30  40  34  40 /   0   0   0   0  10  20

&&

.OTX WATCHES/WARNINGS/ADVISORIES...
ID...None.
WA...Air Stagnation Advisory until 10 AM PST Saturday for East Slopes
     Northern Cascades-Moses Lake Area-Northeast Mountains-
     Okanogan Highlands-Okanogan Valley-Upper Columbia Basin-
     Waterville Plateau-Wenatchee Area.

&&

$$



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