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Area forecast discussion
National Weather Service Spokane Washington
1034 am PDT Fri Jul 21 2017

Synopsis...
a warming trend is expected into the weekend and continuing into
early next week. A Pacific cold front will sweep through the
region on Tuesday and Wednesday bringing with it thunderstorms.
The remainder of the work week will be cooler and breezy.

&&

Discussion...
today through sunday: fairly quiet weather for the weekend across
the Pacific northwest. The closed low is moving into Alberta this
morning with the next wave getting ready to move into western Washington
and British Columbia. This wave will provide an increase in high level clouds
through the day across the north. The broad ridge builds across
the region on Saturday. There is some weak instability across the
Cascades in the afternoon and have added a slight chance of
thunder for the afternoon hours. Sunday the next closed low will
move into British Columbia. Models are showing some instability
across southeast Washington and the Idaho Panhandle, but it looks to be
capped, and there is very little moisture associated with it.
Sunny skies are expected.

Today will be the last day of below average temperatures.
Saturday and Sunday we will warm to slightly above average
readings...or upper 80s to 90s across the valleys. /Nisbet

Sunday night through friday: the strong wave passing by to our
north on Sunday night still looks like it will send a burst of
wind down the Okanogan Valley and into the western basin. Probably
enough to generate at least gusts to 30 mph and possibly higher.
These winds will decrease some during the day on Monday, but could
be strong enough to create a hazardous fire weather situation.
There will be little if any cooling from these northerly winds,
and so temperatures will remain in the 90s for Monday and Tuesday.

The next in the series of Pacific waves will move into western British Columbia
by Tuesday. But this one will have more amplitude than its
predecessor, and thus have more of an influence on our weather.
Additionally, there will be a weak wave off the northern California coast
that will be drawn up ahead of the Pacific low. This should cause
quite a bit of thunderstorm activity over Oregon on Tuesday which
will migrate into our area Tuesday night and Wednesday. Currently
it appears that the timing of the Pacific wave would be such that
the majority of the thunderstorm activity would be across the
northern and eastern mountains, with very little chance for storms
over the Cascades. But it will only take a small adjustment in the
speed of this wave to give a rather different result, so stay
tuned.

After this wave passes through, temperatures will cool back down
into the lower 80s with breezy winds for the remainder of the
week. Rj

&&

Aviation...
18z tafs: another wave is moving onto the West Coast. This will
spread middle to high clouds, thickening somewhat across the taf
locations today. Clouds will thin and begin push north Saturday
morning. /Svh

&&

Preliminary point temps/pops...
Spokane 82 60 88 64 91 63 / 0 0 0 0 0 0
Coeur D'Alene 81 55 87 59 90 58 / 0 0 0 0 0 0
Pullman 80 55 87 59 91 59 / 0 0 0 0 0 0
Lewiston 88 61 94 66 100 67 / 0 0 0 0 0 0
Colville 83 54 89 58 92 54 / 0 0 0 0 0 0
Sandpoint 79 49 85 53 88 51 / 0 0 0 0 0 0
Kellogg 78 52 84 56 88 57 / 0 0 0 0 0 0
Moses Lake 86 58 94 61 96 61 / 0 0 0 0 0 0
Wenatchee 87 64 93 68 92 65 / 0 0 0 0 0 0
Omak 87 59 93 63 94 61 / 0 0 0 0 0 0

&&

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

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