Prognostic Meteorological Discussion
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000
FXUS01 KWBC 191958
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
358 PM EDT THU OCT 19 2017

VALID 00Z FRI OCT 20 2017 - 00Z SUN OCT 22 2017

...HEAVY SNOW FOR THE NORTHERN CASCADES...

...SNOW FOR PARTS OF THE CASCADES AND NORTHERN/CENTRAL ROCKIES
ALONG WITH THE SIERRAS...

...HEAVY RAIN POSSIBLE OVER THE PACIFIC NORTHWEST...

A FRONT OVER THE NORTHWEST WILL STEADILY MOVES EASTWARD TO THE
NORTHERN/CENTRAL PLAINS AND SOUTHERN HIGH PLAINS BY SATURDAY.  THE
SYSTEM WILL PRODUCE RAIN, HEAVY AT TIMES OVER PARTS OF NORTHERN
CALIFORNIA AND THE PACIFIC NORTHWEST THAT WILL MOVE EASTWARD INTO
THE NORTHERN INTERMOUNTAIN REGION AND INTO CENTRAL CALIFORNIA BY
FRIDAY MORNING.  AS THE BOUNDARY MOVES INLAND THE SNOW LEVELS WILL
LOWER WITH SNOW STARTING OVERNIGHT IN THE HIGHER ELEVATIONS OF THE
CASCADES AND THE SISKIYOUS/SHASTA WITH SNOW DEVELOPING OVER THE
HIGHEST ELEVATIONS OF THE SIERRAS BY FRIDAY MORNING.  ON FRIDAY,
SNOW AND LOWER ELEVATION RAIN WILL DEVELOP OVER PARTS OF THE
NORTHERN INTERMOUNTAIN REGION/NORTHERN ROCKIES INTO PARTS OF THE
GREAT BASIN THAT WILL EXPAND INTO THE CENTRAL ROCKIES WITH RAIN
OVER THE NORTHERN HIGH PLAINS BY SATURDAY MORNING.  BEHIND THE
FRONT, ONSHORE FLOW WILL AID IN CONTINUING THE RAIN AND HIGHER
ELEVATION SNOW OVER PACIFIC NORTHWEST AND NORTHERN CALIFORNIA
THROUGH SATURDAY, WITH HEAVY RAIN RETURNING TO THE PACIFIC
NORTHWEST ON SATURDAY.

MEANWHILE, UPPER-LEVEL ENERGY OVER PARTS OF THE SOUTHWEST/GREAT
BASIN AND SOUTHERN ROCKIES/SOUTHERN HIGH PLAINS WILL MOVE
NORTHEASTWARD TO THE UPPER MISSISSIPPI VALLEY/UPPER GREAT LAKES BY
FRIDAY.  MOISTURE WILL ALSO STREAM NORTHWARD OVER THE SOUTHERN
PLAINS


...MORE TO FOLLOW...



ZIEGENFELDER



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