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Area forecast discussion 
National Weather Service Spokane Washington
1025 PM PDT Friday Sep 4 2015

Synopsis...

A low pressure system will bring widespread rain and much cooler
temperatures to the Idaho Panhandle and portions of eastern
Washington Saturday. Light showers may linger mainly across the
mountains Sunday and Monday. A drying and warming trend is
expected next week.



&&

Discussion...
the upper level low is dropping south into Oregon this evening
with areas of showers and even a few thunderstorms being pushed
north into southeast Washington and the central Panhandle of Idaho.
Precipitation will increase over the region tonight as the best
area of lift moves over the eastern half of the forecast area.
Models are still depicting a bulls eye of precip over extreme
eastern Washington overnight with a sharp dropoff in quantitative precipitation forecast from Ritzville
west. The wildfires in north Idaho will likely get a good wetting
rain out of this system along with the kiniksu complex in Pend
Oreille County and possibly the CArpenter Rd complex in southern
Stevens County but the big fires in Okanogan and Chelan counties
will get little if any precipitation. Only minor changes made to
the current forecast package to adjust pops and min temps to
account for recent trends in observations. /Kelch

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Aviation...
06z tafs: showers will drift north into extreme southeast Washington and
central Panhandle of Idaho tonight along with isolated
thunderstorms possible but confidence is low that any ts will
affect a particular taf site. The wettest interval will be
overnight tonight and into tomorrow as a wet frontal zone stalls
over eastern Washington and north Idaho from about 09z on bringing
MVFR conditions to taf sites except keat and kmwh. Kmwh will be on
the western edge of the precipitation shield and may see very
little rain. As the low moves east Sat afternoon, any breaks in
cloud cover may allow convection to develop, with isolated
thunderstorms possible across the forecast area. Cascade Gap winds
will increase after 18z Sat with gusts of 25 to 30 kts possible at
keat. /Ek



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Preliminary point temps/pops...
Spokane 46 53 43 66 45 68 / 80 100 50 10 10 10
Coeur D'Alene 46 53 43 65 44 67 / 80 90 70 10 10 10
Pullman 44 53 41 64 43 66 / 90 70 60 10 10 10
Lewiston 50 60 48 72 50 72 / 80 70 60 10 10 10
Colville 49 57 44 67 41 70 / 40 90 50 20 20 10
Sandpoint 47 54 45 64 40 66 / 60 100 60 20 20 20
Kellogg 46 52 43 63 40 63 / 70 80 70 30 30 20
Moses Lake 53 71 49 75 48 76 / 30 50 10 10 10 10
Wenatchee 53 72 52 75 51 78 / 10 10 10 10 10 10
Omak 52 73 46 75 45 78 / 10 10 10 10 10 10

&&

Otx watches/warnings/advisories...
Idaho...none.
Washington...none.
&&

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