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Area forecast discussion 
National Weather Service Spokane Washington
857 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.



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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...
00z tafs: low pressure in close proximity to the forecast area
keeps both stratiform and convective cloud cover over next 24 hrs.
Showers will drift north into extreme southeast Washington and central
Panhandle of Idaho this evening 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. Kmwh will be on the western
edge of the precipitation shield and may or may not see any 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. /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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