Prognostic Meteorological Discussion
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FXUS01 KWBC 090658
PMDSPD

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

VALID 12Z FRI DEC 09 2016 - 12Z SUN DEC 11 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...

AN ACTIVE WEATHER PATTERN WILL CONTINUE ACROSS MUCH OF THE WESTERN
U.S. THROUGH THE SHORT RANGE FORECAST PERIOD. A FRONTAL SYSTEM
MOVING ONSHORE IN THE PACIFIC NORTHWEST EARLY THIS MORNING WILL
CONTINUE TO SPREAD PRECIPITATION INLAND TODAY. COLD AIR WILL
LINGER IN THE VALLEYS OF OREGON AND WASHINGTON THIS MORNING, AND A
MIX OF SNOW AND FREEZING RAIN IS POSSIBLE. TEMPERATURES WILL WARM
SOME BY THIS AFTERNOON, CHANGING PRECIPITATION IN THE VALLEYS TO
RAIN. AS THE COLD FRONT MOVES INLAND TONIGHT, SNOW MAY ONCE AGAIN
FALL ACROSS THE INLAND VALLEYS AS COLDER AIR MOVES INTO THE
REGION. ACROSS THE CASCADES, HEAVY SNOW IS POSSIBLE.

FARTHER INLAND, AN ARCTIC FRONTAL BOUNDARY DRAPED ACROSS THE
INTERIOR WEST, ALONG WITH THE APPROACHING PACIFIC FRONTAL SYSTEM,
WILL 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.


RYAN


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