Prognostic Meteorological Discussion
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333
FXUS01 KWBC 101956
PMDSPD

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

VALID 00Z SUN DEC 11 2016 - 00Z TUE DEC 13 2016

...HEAVY SNOWFALL EXPECTED TO CONTINUE FOR THE HIGHER ELEVATIONS
OF THE NORTHWEST...

...SNOW WILL CONTINUE TO SPREAD FROM THE MIDWEST TODAY INTO THE
NORTHEAST BY SUNDAY...


AN ARCTIC FRONTAL BOUNDARY DRAPED ALONG THE HIGHER TERRAIN OF THE
INTERMOUNTAIN WEST AND THE ROCKIES CONTINUES TO KEEP BELOW NORMAL
TEMPERATURES LOCKED IN ACROSS MUCH OF THE NORTHWEST U.S. AND INTO
THE NORTHERN PLAINS. THIS BOUNDARY WILL INTERACT WITH MOISTURE
STREAMING INLAND OFF THE PACIFIC TO PRODUCE HEAVY SNOWFALL IN THE
HIGHER TERRAIN OF THE PACIFIC NORTHWEST, THE INTERMOUNTAIN WEST,
AND THE NORTHERN AND CENTRAL ROCKIES AND HIGH PLAINS. HEAVY RAIN
WILL ALSO BE POSSIBLE IN THE LOWER TERRAIN AND ALONG THE PACIFIC
NORTHWEST COAST. THE RAIN AND SNOW ACROSS THE NORTHWEST IS
EXPECTED TO CONTINUE THROUGH THE WEEKEND AS A SERIES OF UPPER
LEVEL DISTURBANCES MOVE THROUGH ALOFT.

FARTHER EAST, AN UPPER LEVEL SHORTWAVE EJECTING INTO THE PLAINS
WILL HELP TO SPIN UP A LOW PRESSURE SYSTEM AT THE SURFACE THIS
EVENING. SNOWFALL TO THE NORTH AND EAST OF THE LOW THIS AFTERNOON
FROM THE NORTHERN PLAINS TO THE MIDDLE MISSISSIPPI VALLEY WILL
CONTINUE TO EXPAND INTO THE MIDWEST AND GREAT LAKES TONIGHT AND
EVENTUALLY THE NORTHEAST AND NEW ENGLAND BY TOMORROW. WINTER STORM
WATCHES, WARNINGS, AND WINTER WEATHER ADVISORIES ARE IN EFFECT
ACROSS PARTS OF THE MIDWEST AND THE LOWER GREAT LAKES WHERE 4 TO
10 INCHES OF ACCUMULATING SNOW IS POSSIBLE. TO THE SOUTH OF THE
SNOW AREA, FROM THE MISSISSIPPI VALLEY TO THE DEEP SOUTH AND
MID-ATLANTIC, WIDESPREAD MODERATE TO HEAVY RAIN IS POSSIBLE ON
SUNDAY AS A COLD FRONT TRAVERSES THE REGION.


SANTORELLI


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





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