Prognostic Meteorological Discussion
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FXUS01 KWBC 030739
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
339 AM EDT THU SEP 03 2015

VALID 12Z THU SEP 03 2015 - 12Z SAT SEP 05 2015

...HEAVY RAIN POSSIBLE OVER PARTS OF THE UPPER MIDWEST...

...HEAVY RAIN POSSIBLE OVER PARTS OF THE NORTHERN ROCKIES...

...TEMPERATURES WILL BE 10 TO 20 DEGREES ABOVE AVERAGE OVER PARTS
OF THE NORTHERN AND CENTRAL PLAINS...

A FRONT MOVING SOUTHWARD OUT OF EASTERN CANADA WILL ADVANCE TO THE
OHIO VALLEY/MID-ATLANTIC COAST BEFORE DISSIPATING ALONG THE
MID-ATLANTIC COAST BY FRIDAY EVENING.  SHOWERS AND THUNDERSTORMS
WILL DEVELOP ALONG PARTS THE BOUNDARY FROM PARTS OF THE GREAT
LAKES TO THE NORTHEAST THAT WILL SINK SOUTHWARD TO PARTS OF THE
MID-ATLANTIC/OHIO VALLEY BY FRIDAY.   ADDITIONALLY, MOISTURE RICH
AIR ALONG THE GULF COAST AND UPPER-LEVEL DISTURBANCES WILL AID IN
PRODUCING SHOWERS AND THUNDERSTORMS FROM THE WESTERN GULF COAST TO
THE SOUTHEAST AND PARTS OF THE SOUTHERN MID-ATLANTIC COAST THROUGH
FRIDAY EVENING.

A SECOND FRONT EXTENDING FROM THE NORTHERN PLAINS ROUGHLY
SOUTHWESTWARD TO PARTS OF THE GREAT BASIN WILL SLOWLY INCH
EASTWARD TO THE NORTHERN PLAINS/UPPER MISSISSIPPI VALLEY WHILE THE
REST OF THE BOUNDARY TRAILS SOUTHWESTWARD TO PARTS OF THE GREAT
BASIN.  SHOWERS AND THUNDERSTORMS WILL DEVELOP NEAR THE FRONT FROM
THE NORTHERN ROCKIES TO THE UPPER MISSISSIPPI VALLEY WITH A
MAXIMUM AREAL COVERAGE MAINLY DURING THE AFTERNOON AND LATE
EVENING HOURS ON THURSDAY AND FRIDAY.

ALONG THE PACIFIC NORTHWEST COAST, ONSHORE FLOW WILL COME TO AN
END BY THURSDAY EVENING.  RAIN ASSOCIATED WITH THE ONSHORE FLOW
WILL ALSO END BY LATE THURSDAY NIGHT.  UPPER-LEVEL ENERGY MOVING
SOUTHWARD OVER THE NORTHWEST WILL TRIGGER SHOWERS AND
THUNDERSTORMS OVER PARTS OF THE INLAND PORTIONS OF THE PACIFIC
NORTHWEST AND NORTHERN CALIFORNIA BY FRIDAY EVENING.

LASTLY, MONSOONAL MOISTURE AND DAYTIME HEATING WILL AID IN
PRODUCING SHOWERS AND THUNDERSTORMS OVER PARTS OF THE
SOUTHERN/CENTRAL ROCKIES AND PARTS OF THE GREAT BASIN/SOUTHWEST
DURING THURSDAY AND FRIDAY AFTERNOON INTO LATE EVENING.


ZIEGENFELDER


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