Scientific Forecaster Discussion

Return to Local Conditions & Forecast

Without Abbreviations
With Abbreviations

Area forecast discussion 
National Weather Service Spokane Washington
903 am PST Friday Feb 27 2015

Synopsis...
a weather system will clip the region today with the best chance
for rain and mountain snow showers in the Cascades. Cooler,
breezy, and dry weather is expected on Saturday. Another weather
system will pass through Monday and Tuesday with wintry weather
possible especially the Idaho Panhandle. Much colder air will move
into the area behind this system with temperatures well below
average for the middle of next week.

&&

Discussion...
morning update: steady precipitation continues to develop along
the northeastern periphery of an area of low pressure sagging down
the Washington coast. At times, moderate rain and mountain snow is being
observed across portions of southern Chelan County including
Wenatchee and Hwy 97 corridor near Blewett Pass. This will lead to
wintry travel for the next hour or so with the late February sun
angle likely to warm pavement temperatures enough to promote
melting and mainly wet roads. We should see a gradual decreasing
trend in steady precipitation through the afternoon but a
continued threat for light showers will linger into the evening as
the the atmosphere destabilizes under a 500mb cold pool of -28c.
The strength and coverage of these showers will highly depend on
whether the clouds break allowing some warming at the surface. The
best chance for any shower activity will stretch along a line from
Republic to Wenatchee...west into the Cascades.

Further east, the main story will be breezy northeast
winds...clear to partly cloudy skies...and seasonal temperatures.
With mostly clear skies across much of northern Idaho and far
eastern reaches of Washington and good mixing today, we have bumped up
temperatures with the coolest air not expected to bleed into the
region until this evening and overnight. /Sb

&&

Aviation...
18z tafs: main concern for cigs and vis restrictions will be
across the Cascades and keat. Low pressure sagging down the coast
will keep rain and MVFR conditions through this morning with
improvement expected btwn 20-22z. The steady pcpn will transition
to light sct -shra ending this evening. To the east, the main
aviation concern will be winds. Expect sustained NE winds
15-18kts with gusts around 25kts after 18-19z then increasing
after 00z 18-25kts with gusts 25-30kts through Saturday afternoon.
This will bring drier and cooler air into the region clearing out
any moisture near the Cascades by Sat morning. /Sb



&&

Preliminary point temps/pops...
Spokane 46 23 39 20 41 24 / 10 0 0 0 0 0
Coeur D'Alene 46 23 40 19 43 22 / 10 0 0 0 0 0
Pullman 47 26 38 20 41 24 / 10 10 0 0 0 0
Lewiston 51 29 43 22 45 26 / 10 10 0 0 0 0
Colville 46 25 45 22 46 26 / 20 10 0 0 0 0
Sandpoint 45 22 38 18 40 22 / 0 0 0 0 0 0
Kellogg 43 21 34 18 41 25 / 10 10 0 0 0 0
Moses Lake 52 30 48 23 47 27 / 40 10 0 0 0 0
Wenatchee 46 32 49 27 48 31 / 100 20 0 0 0 10
Omak 47 30 48 24 48 28 / 20 20 0 0 0 10

&&

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

$$

National Weather Service Glossary of Abbreviations