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Area forecast discussion 
National Weather Service Spokane Washington
923 PM PDT Tuesday Jun 2 2015

Synopsis...

Cool and showery weather will linger over the inland northwest
through Wednesday with the best chance for showers in the
mountainous regions of the Idaho Panhandle and northern
Washington. Much warmer weather is expected Friday into the
weekend as a high pressure ridge returns to the region. Saturday,
Sunday and Monday will feel like Summer with afternoon
temperatures in the mid 80s to low 90s.

&&

Discussion...
evening update: water vapor reveals a tight circulation or
vorticity maximum tracking into southeast Washington at this hour. This feature
is supplying the lift and utilizing whats left of a weak instability
field from heating earlier today. As such...clusters of showers
and thunderstorms are slowly tracking east from the Asotin/Nez
Perce County border into eastern portions of Nez Perce County as
well as the Camas Prairie. These are not near the variety of
storms that we saw on Monday but could still bring some downpours
and lightning strikes.

This wave is expected to pivot to the northeast overnight. There
looks to be enough instability within the 850-500mb layer to keep
a mention of showers. A stray thunderstorm is possible but
confidence is too low to mention in the forecast at this time.

Closer to the Canadian border...a deformation axis remains ongoing
but has since shifted north of Hwy 20. Partial clearing on its
southern periphery has introduced some convective showers as well.
These will decay with sunset but the band looks to linger north of
line from Omak to Northport through much of the night. Rainfall
rates are decreasing within this band and see very little
reasoning to keep the Flood Advisory ongoing.

We have also added patchy fog and incr temps in the northern
valleys with dewpoints running in the mid to upper 50s. Models
indicate a small wedge of drier air shifting into NE Washington and nrn Idaho
so held off on major adjustments but locations like Republic,
Omak, Oroville, and Laurier should remain quite mild. /Sb



&&

Aviation...
06z tafs: a shortwave is tracking through southeast Washington and nrn Idaho btwn
06-10z. There is weak midlevel instability ahead of this wave
which will keep the threat for isolated showers into the overnight
periods. A stray thunderstorm is not out of the question but
carries a very low probability. Closer to the Canadian border
a persistent shield of light rain will deliver overcast skies
with cigs ranging 4-6k above ground level. This will mainly impact communities
north of a line from Omak to Colville. Trof remains over region
Wed aftn with a small potential for shallow convective showers aft
21z. Models also indicating the potential for sct-bkn stratus
across southeast Washington and skirting Spokane-cda 10-15z. This carries low
confidence for restrictions. /Sb



&&

Preliminary point temps/pops...
Spokane 50 70 50 74 53 82 / 20 20 20 10 10 10
Coeur D'Alene 49 69 48 73 50 81 / 20 30 30 10 10 10
Pullman 44 68 44 71 47 79 / 20 20 20 10 10 10
Lewiston 52 75 52 78 54 84 / 40 30 20 10 10 10
Colville 52 71 48 76 50 84 / 50 40 40 20 20 10
Sandpoint 49 68 46 73 49 78 / 50 50 40 20 20 10
Kellogg 45 68 44 73 47 79 / 20 40 30 10 10 10
Moses Lake 51 76 51 79 54 88 / 10 20 10 10 10 0
Wenatchee 55 74 55 80 57 87 / 10 20 10 10 10 0
Omak 53 72 50 78 52 87 / 50 50 30 10 10 10

&&

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

$$

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