Prognostic Meteorological Discussion
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FXUS01 KWBC 252033
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
432 PM EDT FRI JUL 25 2014

VALID 00Z SAT JUL 26 2014 - 00Z MON JUL 28 2014

...FRONTAL SYSTEM TO BRING THE THREAT OF FLASH FLOODING AND SEVERE
WEATHER TO PORTIONS OF THE CENTRAL AND EASTERN U.S...

...UNSEASONABLY COOL AIR MASS WILL MOVE INTO THE NORTH CENTRAL
U.S. BEHIND THE COLD FRONT...

A RATHER POTENT UPPER-LEVEL DISTURBANCE FOR MID-SUMMER WILL DIVE
INTO THE NORTHERN PLAINS FROM CANADA ON SATURDAY. AHEAD OF THIS
UPPER-LEVEL DISTURBANCE, A SURFACE LOW-PRESSURE SYSTEM WILL CROSS
THE MIDWEST ON SATURDAY AND REACH THE LOWER GREAT LAKES BY SUNDAY.
A PORTION OF THIS FRONTAL BOUNDARY WILL BECOME SLOW-MOVING OR
STATIONARY AT TIMES ACROSS THE CENTRAL U.S., AND WILL SERVE AS A
FOCUS FOR SHOWER AND THUNDERSTORM DEVELOPMENT. SEVERAL AREAS OF
FOCUSED SHOWER AND THUNDERSTORM DEVELOPMENT ARE POSSIBLE TONIGHT
THROUGH THE WEEKEND. THE MAJORITY OF THE THUNDERSTORM ACTIVITY
WILL TAKE PLACE FROM THE CENTRAL PLAINS TO THE MIDWEST ON SATURDAY
AND WILL SHIFT EASTWARD TO THE LOWER GREAT LAKES AND CENTRAL
APPALACHIANS SATURDAY NIGHT INTO SUNDAY MORNING. SEVERE
THUNDERSTORMS WILL BE A POSSIBILITY FROM THE CENTRAL PLAINS AND
MIDWEST/OHIO VALLEY ON SATURDAY AND EXTENDING EASTWARD TO THE
MID-ATLANTIC ON SUNDAY. FOR MORE INFORMATION ON THE SEVERE WEATHER
THREAT, PLEASE REFER TO THE CONVECTIVE OUTLOOK PRODUCTS ISSUED BY
THE STORM PREDICTION CENTER. FLASH FLOODING WILL ALSO BE A
POSSIBILITY SATURDAY NIGHT INTO SUNDAY ACROSS PORTIONS OF THE OHIO
VALLEY AND CENTRAL APPALACHIANS.

ELSEWHERE, MONSOONAL MOISTURE WILL CONTINUE TO BRING GENERALLY
SCATTERED SHOWERS AND THUNDERSTORMS TO MUCH OF THE SOUTHWEST AND
PORTIONS OF THE CENTRAL ROCKIES THROUGH THE WEEKEND. A MOIST AND
UNSTABLE AIR MASS WILL ALSO RESULT IN SCATTERED SHOWERS AND
THUNDERSTORMS ACROSS THE GULF COAST STATES.

AHEAD OF THE COLD FRONT, TEMPERATURES WILL GENERALLY REMAIN ABOVE
AVERAGE FROM THE SOUTHWEST TO THE SOUTHERN PLAINS TO THE THE
SOUTHEAST. BEHIND THE COLD FRONT, AN UNSEASONABLY COOL AIR MASS
WILL MOVE IN, WITH HIGH TEMPERATURES ON SUNDAY ACROSS THE NORTHERN
PLAINS AND UPPER MIDWEST AS MUCH AS 10 TO 15 DEGREES BELOW
AVERAGE. THIS UNSEASONABLY COOL AIR MASS IS FORECAST TO CONTINUE
SPREADING SOUTHEASTWARD BEHIND THE COLD FRONT BEYOND THE SHORT
RANGE FORECAST PERIOD.


RYAN


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