Area Forecast Discussion
Issued by NWS Spokane, WA

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FXUS66 KOTX 070538
AFDOTX

Area Forecast Discussion
National Weather Service Spokane WA
1038 PM PDT WED MAY 6 2015

.SYNOPSIS...
Low pressure will bring isolated showers overnight to southeast
Washington and the Camas Prairie. The weather will remain generally
dry and warm through the end of the week, except for a small
shower threat over the Idaho Panhandle mountains Friday. In
addition expect occasionally breezy conditions, especially on
Friday. Temperatures moderate by the beginning of next week as a
weather pattern change occurs. This change will bring a return to
cooler temperatures and a chance of precipitation.



&&

.DISCUSSION...
The center of the upper level low has drifted south into central
Oregon this evening, taking most of the dynamic support for
showers with it. There is some moisture wrapping around the low,
seen on IR satellite imagery, advancing toward our southeast
zones. Some weak radar returns are moving east from extreme
southern Shoshone County toward the Northeast Blues. This area
could see isolated to scattered showers overnight. Drier air will
filter in from the north tonight, ending precipitation from north
to south by morning. The main forecast concern will be gusty winds
channeled down the northern valleys along with low relative
humidity Thursday afternoon and evening resulting in elevated fire
weather concerns. See FIRE WEATHER discussion below. /Kelch

&&

.AVIATION...
06Z TAFS: VFR conditions expected at all TAF sites through 06Z
Friday. An upper level low will drift south of the region tonight
with some wrap around moisture bringing possible showers into
KLWS and KPUW. The threat of showers will end by mid- morning
Thursday as the low sinks south of the region. /EK



&&

.FIRE WEATHER...
Low afternoon humidity and breezy wind conditions from the north are
in the forecast, especially Friday. A tightening pressure gradient
between low pressure exiting to the south and high pressure to the
north will lead to some breezy to locally windy conditions from
the north. Initially, through Thursday, these higher gradient
winds are expected to be localized to the Okanogan Valley. However
as a secondary system swings east of the region and high pressure
becomes more established across western/central Canada, this will
lead to increasing gradient winds over a broader region especially
going into Friday morning and afternoon. The Okanogan Valley is
expected to see north winds peaking between 5AM and 2 PM, in the
north- to-south gradient. Thereafter models show the northeast-to-
southwest gradient through the afternoon, shifting the main focus
for higher winds to the north Idaho Valley out through the
Columbia Basin. In the northerly flow drier Canadian air is
expected infiltrate the region, leading lower minimum RH values
from day-to-day between Wednesday and Friday. This means minimum
RH values potentially around the mid to upper teens or lower 20s.
This translates to potential concerns for the fire weather
community, with combination of low RH and winds. However without
any other significant trigger and it still remaining early in the
fire weather year, we will just go with a heads-up headline and
advise keeping vigilant should any fire activity does occur. /J.
Cote`

&&


.PRELIMINARY POINT TEMPS/POPS...
Spokane        41  69  42  69  42  71 /   0   0   0   0   0   0
Coeur d`Alene  40  68  39  68  39  70 /   0   0   0  10   0   0
Pullman        40  67  38  69  38  69 /  20  10   0   0   0   0
Lewiston       44  73  44  74  44  74 /  30  10  10   0  10  10
Colville       41  74  42  73  40  75 /   0   0   0  10   0   0
Sandpoint      36  67  36  66  34  69 /   0   0  10  10   0  10
Kellogg        39  66  38  66  37  67 /  10  10   0  10   0  10
Moses Lake     43  76  46  77  44  77 /   0   0   0   0   0   0
Wenatchee      44  75  48  78  48  79 /   0   0   0   0   0   0
Omak           42  74  42  75  42  77 /   0   0   0   0   0   0

&&

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

$$



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