Prognostic Meteorological Discussion
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FXUS01 KWBC 220739
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
338 AM EDT TUE JUL 22 2014

VALID 12Z TUE JUL 22 2014 - 12Z THU JUL 24 2014

...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER PARTS OF
THE CENTRAL PLAINS/MIDDLE MISSISSIPPI VALLEY AND UPPER GREAT
LAKES...

...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER PARTS OF
THE NORTHERN HIGH PLAINS...

A FRONT EXTENDING FROM THE UPPER GREAT LAKES TO THE CENTRAL PLAINS
WILL MOVE EASTWARD TO THE NORTHEAST/MID-ATLANTIC COAST AND
SOUTHWARD TO THE TENNESSEE VALLEY/SOUTHERN PLAINS BY WEDNESDAY
EVENING.  THE SYSTEM WILL PRODUCE SHOWERS AND THUNDERSTORMS ALONG
AND AHEAD OF THE BOUNDARY OVER THE UPPER GREAT LAKES MOVING TO NEW
ENGLAND/MID-ATLANTIC AND EXPANDING INTO THE OHIO/TENNESSEE VALLEYS
BY WEDNESDAY.

MEANWHILE, UPPER-LEVEL ENERGY OVER THE CENTRAL GULF COAST AND
UPPER-LEVEL IMPULSES OVER THE SOUTHEAST WILL TRIGGER SHOWERS AND
THUNDERSTORMS OVER THE REGION THROUGH TUESDAY EVENING.  ON
WEDNESDAY THE SHOWERS AND THUNDERSTORMS WILL RETREAT TO THE LOWER
MISSISSIPPI VALLEY COAST AND ALONG THE SOUTHEAST COAST, TOO.

IN ADDITION, AN UPPER-LEVEL LOW WILL SLOWLY COME ONSHORE OVER THE
PACIFIC NORTHWEST BY WEDNESDAY EVENING.  THE ENERGY AND THE
GENERAL UPPER-LEVEL TROUGHING WILL AID IN PRODUCING SHOWERS AND
THUNDERSTORMS OVER PARTS OF THE NORTHERN INTERMOUNTAIN REGION TO
THE NORTHERN HIGH PLAINS THROUGH WEDNESDAY.  RAIN WILL ALSO
DEVELOP ALONG PARTS OF THE PACIFIC NORTHWEST COAST.  ELSEWHERE,
DIURNAL HEATING AND MONSOONAL MOISTURE WILL PRODUCE SHOWERS AND
THUNDERSTORMS OVER PARTS OF THE SOUTHERN ROCKIES DURING THE LATE
AFTERNOON AND EVENING ON TUESDAY AND WEDNESDAY.


ZIEGENFELDER


GRAPHICS AVAILABLE AT WWW.WPC.NCEP.NOAA.GOV
$$





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