Prognostic Meteorological Discussion
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000
FXUS01 KWBC 172046
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
345 PM EST FRI NOV 17 2017

VALID 00Z SAT NOV 18 2017 - 00Z MON NOV 20 2017

...HEAVY PRECIPITATION POSSIBLE OVER THE OLYMPIC PENINSULA...

...HEAVY PRECIPITATION POSSIBLE OVER PARTS OF THE OHIO
VALLEY/LOWER GREAT LAKES...

A FRONT EXTENDING FROM THE MIDDLE MISSISSIPPI VALLEY/CENTRAL
PLAINS INTO CENTRAL ROCKIES/SOUTHWEST WILL MOVE EASTWARD TO THE
EAST COAST BY SUNDAY.  SHOWERS AND THUNDERSTORMS WILL DEVELOP
ALONG AND NEAR THE WARM FRONT OVER THE MIDDLE MISSISSIPPI VALLEY
THAT WILL EXPAND INTO THE OHIO VALLEY OVERNIGHT FRIDAY.  ON
SATURDAY AFTERNOON, THE SHOWERS AND THUNDERSTORMS WILL DEVELOP
ALONG AND AHEAD OF THE COLD FRONT FROM THE OHIO VALLEY INTO THE
LOWER MISSISSIPPI VALLEY THAT WILL CHANGE OVER TO RAIN OVERNIGHT
SATURDAY FROM THE LOWER GREAT LAKES TO THE LOWER MISSISSIPPI
VALLEY/CENTRAL GULF COAST THAT WILL MOVE TO THE EAST COAST BY
SUNDAY MORNING.  IN ADDITION, THE SYSTEM`S UPPER-LEVEL ENERGY OVER
THE GREAT BASIN INTO THE NORTHERN ROCKIES THAT WILL LIKEWISE, MOVE
TO THE NORTHEAST/MID-ATLANTIC BY SUNDAY.  THE ENERGY WILL AID IN
PRODUCING SNOW AND LOWER ELEVATION RAIN OVER PARTS OF THE GREAT
BASIN/CENTRAL ROCKIES THAT WILL SLOWLY END OVER THE AREA BY
SATURDAY MORNING.

MEANWHILE, ANOTHER FRONT OVER THE UPPER GREAT LAKES/UPPER
MISSISSIPPI VALLEY ROUGHLY NORTHWESTWARD TO THE NORTHERN HIGH
PLAINS INTO WEST-CENTRAL CANADA WILL UNDERGO A METAMORPHOSIS AS
THE EASTERN HALF OF THE BOUNDARY SEPARATES ON SATURDAY WHILE
MOVING INTO CANADA BY SUNDAY MORNING.  RAIN AND SNOW WILL DEVELOP
ALONG THE EASTERN PARTS OF THE FRONT OVER THE UPPER GREAT
LAKES/UPPER MISSISSIPPI VALLEY THAT WILL CHANGEOVER TO RAIN BY
SATURDAY MORNING OVER THE GREAT LAKES.  RAIN WILL ALSO DEVELOP
OVER PARTS OF THE CENTRAL PLAINS/MIDDLE MISSISSIPPI VALLEY
OVERNIGHT FRIDAY THAT WILL END BY SATURDAY AFTERNOON.

ELSEWHERE, ONSHORE FLOW OFF THE PACIFIC INTO THE PACIFIC NORTHWEST
WILL AID IN PRODUCING RAIN AND HIGHEST ELEVATION SNOW THROUGH
SATURDAY MORNING.  THE ONSHORE FLOW WILL COME OUT OF THE SOUTHWEST
STEERING MOISTURE INTO THE OLYMPIC PENINSULA EARLY SATURDAY INTO
SUNDAY.  THE MOISTURE WILL AID IN PRODUCING MAINLY RAIN OVER THE
OLYMPIC PENINSULA SATURDAY INTO SUNDAY.


ZIEGENFELDER


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





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