Prognostic Meteorological Discussion
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000
FXUS01 KWBC 182000
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
259 PM EST MON DEC 18 2017

VALID 00Z TUE DEC 19 2017 - 00Z THU DEC 21 2017

...HEAVY SNOW POSSIBLE OVER THE CASCADES AND NORTHERN ROCKIES...

...HEAVY RAIN POSSIBLE OVER PARTS OF THE PACIFIC NORTHWEST COAST...

...HEAVY RAIN POSSIBLE OVER PORTIONS OF THE SOUTHERN PLAINS INTO
THE SOUTHERN APPALACHIANS...

ONSHORE FLOW AHEAD OF THE NEXT SYSTEM WILL AID IN PRODUCING RAIN
AND HIGHEST ELEVATION SNOW OVER PARTS OF THE PACIFIC NORTHWEST AND
SNOW AND LOWER ELEVATIONS RAIN OVER PARTS OF THE NORTHERN
INTERMOUNTAIN REGION/NORTHERN ROCKIES THROUGH TUESDAY MORNING.  ON
TUESDAY THE NEXT SYSTEM WILL BEGIN TO MOVE ONSHORE OVER THE
PACIFIC NORTHWEST MOVING INLAND TO THE NORTHERN ROCKIES/GREAT
BASIN AND PARTS OF CENTRAL CALIFORNIA BY WEDNESDAY.  THE SNOW
LEVELS WILL DECREASE OVER THE NORTHWEST AS THE ASSOCIATED FRONT
MOVES INLAND.  RAIN AND HIGHER ELEVATIONS SNOW WILL DEVELOP OVER
THE NORTHWEST AND SNOW OVER THE NORTHERN INTERMOUNTAIN
REGION/NORTHERN ROCKIES ON TUESDAY.

MORE TO FOLLOW





ZIEGENFELDER

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