Prognostic Meteorological Discussion
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614
FXUS01 KWBC 091958
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
258 PM EST FRI DEC 09 2016

VALID 00Z SAT DEC 10 2016 - 00Z MON DEC 12 2016

...WINTRY WEATHER EXPECTED FOR PORTIONS OF THE PACIFIC NORTHWEST...

...HEAVY SNOW POSSIBLE ACROSS PORTIONS OF THE CENTRAL AND NORTHERN
ROCKIES AND INTERMOUNTAIN WEST...

...LAKE EFFECT SNOWS EXPECTED TO CONTINUE DOWNWIND OF THE GREAT
LAKES...

A WINTER STORM SYSTEM WILL IMPACT MUCH OF THE WESTERN STATES
THROUGH THE WEEKEND, BRINGING WIDESPREAD PRECIPITATION FROM THE
WEST COAST TO THE NORTHERN/CENTRAL ROCKIES. MOST AREAS WILL HAVE
SNOW; HOWEVER POCKETS OF RAIN AND FREEZING RAIN MAY BE POSSIBLE AT
THE LOWER ELEVATIONS WHERE COLDER AIR HAS SETTLED. NUMEROUS WINTER
STORM WARNINGS AND ADVISORIES ARE IN EFFECT FROM WASHINGTON/OREGON
TO CENTRAL MONTANA/WYOMING/COLORADO; WITH HIGH WIND WARNINGS FOR
CENTRAL WYOMING AND WIND ADVISORIES ALONG AND EAST OF THE SIERRAS.
ACROSS THE CASCADES, HEAVY SNOW IS POSSIBLE.

AN ARCTIC FRONTAL BOUNDARY DRAPED ACROSS THE INTERIOR WEST, ALONG
WITH THE APPROACHING PACIFIC FRONTAL SYSTEM, WILL CONTINUE TO
GENERATE PRODUCE WIDESPREAD SNOW TODAY AND TONIGHT ACROSS PORTIONS
OF THE NORTHERN ROCKIES AND INTERMOUNTAIN WEST, SPREADING INTO THE
CENTRAL ROCKIES ON SATURDAY. HEAVY SNOW IS POSSIBLE ACROSS THESE
AREAS, PARTICULARLY AT HIGHER ELEVATIONS. AREAS OF SNOW ARE ALSO
POSSIBLE ON SATURDAY ACROSS THE NORTHERN PLAINS AND THE MIDWEST AS
A SERIES OF UPPER-LEVEL DISTURBANCES PASS OVERHEAD, AND A SURFACE
FRONTAL ZONE STRENGTHENS EAST OF THE ROCKIES.

LAKE EFFECT SNOWS WILL CONTINUE TODAY AND SATURDAY DOWNWIND OF THE
GREAT LAKES, AS COLD CANADIAN AIR STREAMS ACROSS THE RELATIVELY
WARM WATERS OF THE LAKES. SNOW MAY BE HEAVY OVER LOCALIZED AREAS,
WITH GUSTY WINDS ALSO POSSIBLE.


CAMPBELL


GRAPHICS AVAILABLE AT WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_WBG.PHP
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