Prognostic Meteorological Discussion
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000
FXUS01 KWBC 192025
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
424 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
SATURDAY.  MOISTURE WILL ALSO STREAM NORTHWARD OVER THE SOUTHERN
PLAINS MOVING NORTHWARD TO THE UPPER MISSISSIPPI VALLEY BY
SATURDAY MORNING.  SHOWERS AND THUNDERSTORMS WILL DEVELOP OVER
PARTS OF THE SOUTHERN ROCKIES/SOUTHERN HIGH PLAINS AND THE WESTERN
GULF COAST THURSDAY NIGHT INTO FRIDAY MORNING.  ON FRIDAY, THE
SHOWERS AND THUNDERSTORMS WILL CONSOLIDATE OVER THE SOUTHERN
PLAINS, CONTINUING OVER PARTS OF THE SOUTHERN PLAINS THROUGH
SATURDAY.  IN ADDITION, AS THE PLAINS AND MISSISSIPPI VALLEY
MOISTEN UP, THE FRONT FROM THE NORTHWEST MOVES INTO THE
NORTHERN/CENTRAL PLAINS AIDING IN DEVELOPING SHOWERS AND
THUNDERSTORMS ALONG AND AHEAD OF THE BOUNDARY OVER PARTS OF THE
CENTRAL/NORTHERN PLAINS OVERNIGHT FRIDAY THAT WILL EXPAND INTO
PARTS OF THE UPPER/MIDDLE MISSISSIPPI VALLEY BY SATURDAY.


ELSEWHERE, EASTERLY FLOW OFF THE ATLANTIC AND WEAK UPPER-LEVEL
ENERGY WILL AID IN PRODUCING SHOWERS AND THUNDERSTORMS OVER
FLORIDA`S EAST COAST INTO SOUTHERN FLORIDA THAT WILL RETREAT TO
THE SOUTHERN HALF OF FLORIDA BY SATURDAY.


ZIEGENFELDER


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




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