Prognostic Meteorological Discussion
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FXUS01 KWBC 220744
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
344 AM EDT FRI AUG 22 2014

VALID 12Z FRI AUG 22 2014 - 12Z SUN AUG 24 2014

...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER PORTIONS OF
THE CENTRAL ROCKIES...

...HEAVY RAIN OVER THE NORTHERN ROCKIES/HIGH PLAINS AND PARTS OF
THE NORTHERN PLAINS...

...TEMPERATURES WILL BE 10 TO 15 DEGREES BELOW AVERAGE OVER PARTS
OF THE NORTHERN ROCKIES/HIGH PLAINS...

AN UPPER-LEVEL TROUGH OVER THE PACIFIC NORTHWEST WILL MOVE
EASTWARD TO THE NORTHERN HIGH PLAINS BY SATURDAY EVENING.  THE
ENERGY IN COMBINATION WITH UPSLOPE FLOW AND A MOISTURE CONNECTION
FROM THE UPPER MIDWEST WILL AID IN PRODUCING SHOWERS AND
THUNDERSTORMS OVER PARTS OF THE NORTHERN ROCKIES/HIGH PLAINS ON
FRIDAY.  THE SHOWERS AND THUNDERSTORMS WILL EXPAND INTO THE
NORTHERN PLAINS/UPPER MISSISSIPPI VALLEY WHILE INCREASING TO HEAVY
RAIN BY SATURDAY EVENING.

MEANWHILE, A PERSISTENT BOUNDARY EXTENDING FROM THE MID-ATLANTIC
ROUGHLY WESTWARD TO THE CENTRAL PLAINS WILL HAVE HIGH MOISTURE
CONTENT AIR POOLING ALONG THE BOUNDARY THROUGH SATURDAY.  THE
BOUNDARY WILL PROVIDE A FOCUS FOR SHOWERS AND THUNDERSTORMS FROM
PARTS OF THE MID-ATLANTIC TO THE CENTRAL PLAINS THAT WILL TAPER
OFF TO PARTS OF THE SOUTHEAST/TENNESSEE VALLEY BY SATURDAY
EVENING.

ELSEWHERE, UPPER-LEVEL ENERGY OVER THE SOUTHWEST WILL MOVE
NORTHEASTWARD TO THE NORTHERN PLAINS BY SATURDAY.  THE ENERGY WILL
TRIGGER SHOWERS AND THUNDERSTORMS OVER PARTS OF THE
SOUTHERN/CENTRAL ROCKIES THAT WILL EXPAND INTO PARTS OF THE
SOUTHERN/CENTRAL HIGH PLAINS BY FRIDAY EVENING THAT WILL TAPER OFF
TO PARTS OF THE CENTRAL ROCKIES BY SATURDAY EVENING.  IN ADDITION,
SHOWERS AND THUNDERSTORMS WILL DEVELOP OVER PARTS OF FLORIDA
FRIDAY INTO SATURDAY MORNING.


ZIEGENFELDER


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