Prognostic Meteorological Discussion
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000
FXUS01 KWBC 021944
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
343 PM EDT WED SEP 02 2015

VALID 00Z THU SEP 03 2015 - 00Z SAT SEP 05 2015

...FLASH FLOODING POSSIBLE ACROSS PORTIONS OF ARIZONA AND NEW
MEXICO...

...ABOVE AVERAGE TEMPERATURES EXPECTED FOR THE EASTERN TWO-THIRDS
OF THE COUNTRY...

MONSOONAL MOISTURE ACROSS THE SOUTHWESTERN U.S. WILL RESULT IN
SCATTERED AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS THROUGH
THE NEXT COUPLE DAYS. MOISTURE AND RAINFALL RATES MAY BE
SUFFICIENT THIS EVENING TO PRODUCE ISOLATED AREAS OF FLASH
FLOODING ACROSS EASTERN PORTIONS OF ARIZONA AND WESTERN PORTIONS
OF NEW MEXICO.

A COLD FRONT OF PACIFIC ORIGIN IS MOVING ACROSS THE NORTHERN
INTERMOUNTAIN WEST TODAY. THIS FRONT WILL BEGIN TO MOVE INTO THE
NORTHERN PLAINS BY EARLY THURSDAY MORNING, WHILE THE TRAILING END
OF THE FRONT BECOMES STATIONARY ACROSS THE INTERMOUNTAIN WEST.
THIS FRONT WILL BRING SHOWERS AND THUNDERSTORMS TO NORTHERN
PORTIONS OF THE INTERMOUNTAIN WEST ON THURSDAY, WITH SHOWERS AND
THUNDERSTORMS POSSIBLE ACROSS THE NORTHERN PLAINS THURSDAY NIGHT
AND THE UPPER MIDWEST BY FRIDAY AFTERNOON. BEHIND THE COLD FRONT,
TEMPERATURES WILL 10 TO 20 DEGREES BELOW AVERAGE ACROSS MUCH OF
THE PACIFIC NORTHWEST AND PORTIONS OF THE NORTHERN INTERMOUNTAIN
STATES ON THURSDAY AND FRIDAY.

A COLD FRONT WILL MOVE SOUTHWARD FROM CANADA INTO THE LOWER GREAT
LAKES AND THE NORTHEAST ON THURSDAY, WITH SCATTERED SHOWERS AND
THUNDERSTORMS POSSIBLE ALONG THE FRONT. THIS COLD FRONT WILL MOVE
INTO THE MID-ATLANTIC STATES ON FRIDAY, WITH A SCATTERED SHOWERS
AND THUNDERSTORMS STILL POSSIBLE. FARTHER SOUTH, A MOIST AND
UNSTABLE ATMOSPHERE WILL REMAIN IN PLACE THROUGH FRIDAY ACROSS THE
GULF COAST AND PORTIONS OF THE SOUTHEAST, KEEPING SCATTERED
AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS IN PLACE.

HIGH PRESSURE AT THE MID AND UPPER-LEVELS OF THE ATMOSPHERE WILL
PROMOTE ABOVE AVERAGE TEMPERATURES ACROSS MUCH OF THE EASTERN
TWO-THIRDS OF THE NATION. THE MOST SIGNIFICANT ABOVE AVERAGE
TEMPERATURES WILL OCCUR FROM  THE NORTHERN PLAINS TO PORTIONS OF
THE NORTHEAST AND MID-ATLANTIC WHERE TEMPERATURES OF 5 TO 15
DEGREES ABOVE AVERAGE ARE EXPECTED. TEMPERATURES MAY APPROACH 20
DEGREES ABOVE AVERAGE ACROSS THE DAKOTAS ON THURSDAY.


RYAN


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