Prognostic Meteorological Discussion
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000
FXUS01 KWBC 100731
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
231 AM EST SAT DEC 10 2016

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

...PACIFIC FRONTAL SYSTEM EXPECTED TO BRING HEAVY SNOW TO PORTIONS
OF THE ROCKIES AND INTERMOUNTAIN WEST...

...LAKE EFFECT SNOWS EXPECTED TO GRADUALLY LESSEN IN INTENSITY
TODAY...

...DEVELOPING LOW PRESSURE SYSTEM ACROSS THE PLAINS TO BRING SNOW
FROM THE NORTHERN PLAINS TO THE NORTHEAST...

AN ARCTIC FRONTAL BOUNDARY REMAINS DRAPED FROM THE NORTHERN
ROCKIES INTO THE INTERIOR NORTHWEST. A PACIFIC FRONTAL SYSTEM AND
UPPER-LEVEL DISTURBANCE WILL SPREAD MOISTURE INLAND TODAY WHERE IT
WILL INTERACT WITH THE ARCTIC FRONT TO PRODUCE SNOWFALL. SNOW IS
EXPECTED TO BE WIDESPREAD AT THE HIGHER ELEVATIONS OF THE
INTERMOUNTAIN WEST AND CENTRAL/NORTHERN ROCKIES, WHERE HEAVY SNOW
IS POSSIBLE. FARTHER WEST SNOW IS EXPECTED TO CONTINUE ACROSS THE
CASCADES THROUGH THE WEEKEND, WITH RAIN AT THE LOWER ELEVATIONS
CLOSER TO THE COAST,THE RESULT OF PERSISTENT ONSHORE FLOW.

LAKE EFFECT SNOW IS EXPECTED TO CONTINUE INTO TODAY DOWNWIND OF
THE GREAT LAKES, BUT SHOULD BEGIN TO GRADUALLY LESSEN IN INTENSITY
THROUGH THE DAY. FARTHER WEST, A LOW PRESSURE SYSTEM WILL BEGIN TO
TAKE SHAPE ACROSS THE CENTRAL U.S. AS UPPER-LEVEL ENERGY CROSSES
THE ROCKIES AND INTERACTS WITH A LINGERING FRONTAL BOUNDARY. SNOW
IS EXPECTED TO DEVELOP TODAY FROM THE NORTHERN PLAINS TO THE UPPER
GREAT LAKES, SPREADING EAST INTO THE LOWER GREAT LAKES AND THE
NORTHEAST ON SUNDAY. FARTHER SOUTH RAIN IS EXPECTED ON SUNDAY FROM
THE OHIO VALLEY TO THE LOWER MISSISSIPPI VALLEY, SPREADING INTO
THE SOUTHERN/CENTRAL APPALACHIANS BY EARLY MONDAY. A FEW
THUNDERSTORMS WILL BE POSSIBLE ALONG THE GULF COAST.


RYAN


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