Prognostic Meteorological Discussion
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FXUS01 KWBC 230752
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
352 AM EDT SAT AUG 23 2014

VALID 12Z SAT AUG 23 2014 - 12Z MON AUG 25 2014

...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER PARTS OF
THE NORTHERN PLAINS AND THE UPPER MISSISSIPPI VALLEY...

...HEAVY RAIN POSSIBLE OVER PARTS OF THE NORTHERN HIGH PLAINS
EASTWARD TO PARTS OF THE UPPER MISSISSIPPI VALLEY...

...TEMPERATURES WILL BE 10 TO 20 DEGREES BELOW AVERAGE OVER PARTS
OF THE NORTHERN ROCKIES/NORTHERN HIGH PLAINS...

DEVELOPING STORM OVER THE NORTHERN ROCKIES/NORTHERN HIGH PLAINS
WILL LIFT NORTHEASTWARD INTO SOUTH-CENTRAL CANADA BY SUNDAY
EVENING.  HIGH MOISTURE CONTENT AIR AND STRONG UPPER-LEVEL
DYNAMICS WILL COMBINE TO PRODUCE MODERATE TO HEAVY RAIN OVER PARTS
OF THE NORTHERN ROCKIES/NORTHERN HIGH PLAINS ON SATURDAY, WANING
IN INTENSITY ON SUNDAY TO LIGHT RAIN OVER PARTS OF THE NORTHERN
PLAINS.  SOME INSTABILITY SHOWERS AND THUNDERSTORMS WILL DEVELOP
OVER PARTS OF THE NORTHERN ROCKIES ON SUNDAY EVENING.  IN
ADDITION, SHOWERS AND THUNDERSTORMS WILL DEVELOP OVER PARTS OF THE
NORTHERN PLAINS WITH MODERATE TO HEAVY RAIN AT TIMES ALSO ON
SATURDAY.  THE SHOWERS AND THUNDERSTORMS WILL MOVE INTO THE UPPER
MISSISSIPPI VALLEY AND PARTS OF THE UPPER GREAT LAKES ON SUNDAY.
A SECOND AREA OF SHOWERS AND THUNDERSTORMS WILL DEVELOP OVER PARTS
OF THE GREAT BASIN/CENTRAL ROCKIES ON SATURDAY MOVING INTO THE
NORTHERN PLAINS/UPPER MISSISSIPPI VALLEY BY SUNDAY MORNING.

MEANWHILE, A WEAK FRONT EXTENDING FROM THE SOUTHERN MID-ATLANTIC
ROUGHLY WESTWARD TO THE CENTRAL PLAINS WILL SLOWLY SETTLE
SOUTHWARD OVER THE SOUTHEAST TO THE CENTRAL GULF COAST BY SUNDAY.
MOISTURE POOLING ALONG THE BOUNDARY WILL AID IN PRODUCING SHOWERS
AND THUNDERSTORMS FROM THE CENTRAL PLAINS TO THE MID-ATLANTIC,
WANING TO THE SOUTHEAST COAST THEN TO THE EASTERN GULF COAST BY
SUNDAY EVENING. ADDITIONALLY, MONSOONAL MOISTURE AND DIURNAL
HEATING WILL PRODUCE AFTERNOON AND EVENING SHOWERS AND
THUNDERSTORMS OVER PARTS OF THE SOUTHERN/CENTRAL ROCKIES AND PARTS
OF THE GREAT BASIN ON SUNDAY.


ZIEGENFELDER


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