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Area forecast discussion 
National Weather Service Spokane Washington
1114 am PDT Tuesday may 5 2015

Synopsis...breezy conditions are expected today behind the cold
front passage from last night. A low pressure system tracking near
the region will result in a chance of showers and a slight chance
of thunderstorms today and Wednesday...mainly over the Cascades
and Okanogan Highlands during the afternoon and evening. The
weather will generally be dry and warm through the end of the
workweek, except for a small chance of mountain showers over the
Idaho Panhandle. Temperatures will moderate a bit by the weekend
as another weak disturbance approaches the coast. This feature
will likely pass into the area early next week with a return to
cooler temperatures and a chance of precipitation.



&&

Discussion...
forecast update to increase winds a little bit for this afternoon
and increase cloud cover. The upper level low pressure system is
situated right over the southern portion of Vancouver Island. A
-30 celsius cold pool asociated with this low is nudging in over
the Cascades late this morning. This cold pool is expected to push
as far east as the western basin and the western portion of the
northeast mountains through this afternoon. This is the general area
for the best chances of showers will be. Although instability will
be weak, a slight chance for thunderstorms over the east slopes of
the northern Cascades and Okanogan Highlands still looks valid.

Mixing potential will increase through the rest of this morning
into the afternoon. This will bring down stronger winds from
aloft. Expect sustained wind speeds of around 15-20 mph with gusts
up to 25-30 mph at times today. A lot of cumulus is beginning to
develop across the region. This will result in partly sunny to
mostly cloudy skies for most areas, especially in the mountains.
/Svh

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Aviation...
18z tafs: an upper level low pressure system will slowly move into
British Columbia and Washington today. This will destabilize the atmosphere with
surface heating through this afternoon. The taf sites will
generally see flat cumulus cover. Better chances for deeper
cumulus with showers will be across the Cascade mtns and over into
the Okanogan Highlands. There is also a chance for thunderstorms
across these areas and mainly near the Canadian border. Winds will
be breezy with gusts between 20-30 kts through the afternoon. /Svh



&&

Preliminary point temps/pops...
Spokane 60 36 60 39 68 42 / 10 10 20 10 10 0
Coeur D'Alene 60 35 61 37 67 40 / 0 10 20 10 10 0
Pullman 59 34 59 37 67 37 / 0 10 20 10 10 10
Lewiston 66 39 65 42 72 45 / 0 0 20 10 10 10
Colville 63 37 64 38 71 41 / 20 30 30 20 0 0
Sandpoint 60 33 60 34 67 35 / 0 10 20 10 10 0
Kellogg 58 35 59 37 65 37 / 0 10 20 10 10 10
Moses Lake 66 38 66 40 74 45 / 10 20 20 20 0 0
Wenatchee 64 43 64 44 75 47 / 10 20 30 20 0 0
Omak 64 36 65 38 72 42 / 20 20 20 20 0 0

&&

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

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