Prognostic Meteorological Discussion
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FXUS01 KWBC 280755
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
354 AM EDT FRI AUG 28 2015

VALID 12Z FRI AUG 28 2015 - 12Z SUN AUG 30 2015

...HEAVY RAIN POSSIBLE OVER PARTS OF THE UPPER/MIDDLE MISSISSIPPI
VALLEY...

...HEAVY RAIN POSSIBLE OVER PARTS OF THE PACIFIC NORTHWEST...

STORM OVER THE MIDDLE MISSOURI VALLEY WILL SLOWLY ADVANCE INTO THE
UPPER GREAT LAKES BY SATURDAY.  THE SYSTEM WILL PRODUCE SHOWERS
AND THUNDERSTORMS FROM PARTS OF THE SOUTHERN HIGH PLAINS
NORTHEASTWARD TO THE UPPER GREAT LAKES ON FRIDAY MORNING, WANING
TO PARTS OF THE MIDDLE MISSISSIPPI VALLEY BY FRIDAY EVENING AND
MOVING INTO PARTS OF THE WESTERN OHIO VALLEY BY SATURDAY EVENING.
RAIN WILL DEVELOP OVER PARTS OF THE UPPER MISSISSIPPI VALLEY/UPPER
GREAT LAKES THAT WILL MOVE INTO THE GREAT LAKES BY SATURDAY.

MEANWHILE, A FRONT OVER THE EASTERN PACIFIC WILL MOVE ONSHORE OVER
THE PACIFIC NORTHWEST ON EARLY SATURDAY MOVING INLAND TO THE
NORTHERN INTERMOUNTAIN REGION/NORTHERN HIGH PLAINS BY SATURDAY.
THE SYSTEM WILL PRODUCE RAIN OVER THE PACIFIC NORTHWEST ON FRIDAY
MORNING THEN TAPERING OFF BY FRIDAY EVENING.  A SECOND SURGE COMES
ONSHORE OVERNIGHT FRIDAY PRODUCING MORE RAIN OVER THE PACIFIC
NORTHWEST AND PARTS OF NORTHERN CALIFORNIA ON SATURDAY.
ADDITIONALLY, SOME SHOWERS AND THUNDERSTORMS WILL DEVELOP OVER
PARTS OF THE NORTHERN INTERMOUNTAIN REGION/NORTHERN ROCKIES BY
SATURDAY EVENING.

EASTERLY FLOW OFF THE ATLANTIC WILL STREAM MOISTURE INTO THE
SOUTHEAST AND DEVELOP SHOWERS AND THUNDERSTORMS ALONG AN OLD
BOUNDARY OVER THE AREA THROUGH SATURDAY.  IN ADDITION, MONSOONAL
MOISTURE AND DAYTIME HEATING WILL PRODUCE SHOWERS AND
THUNDERSTORMS OVER PARTS OF THE SOUTHERN/CENTRAL ROCKIES AND THE
SOUTHWEST ALSO THROUGH SATURDAY EVENING.


ZIEGENFELDER



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