Prognostic Meteorological Discussion
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000
FXUS01 KWBC 270817
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
416 AM EDT SUN JUL 27 2014

VALID 12Z SUN JUL 27 2014 - 12Z TUE JUL 29 2014

...FLASH FLOODING AND SEVERE WEATHER POSSIBLE ACROSS THE CENTRAL
APPALACHIANS AND NORTHERN MID-ATLANTIC STATES...

...ANOTHER ROUND OF COOLER AND DRIER CANADIAN AIR WILL SPREAD
SOUTHEASTWARD THROUGH THE CENTRAL AND EASTERN U.S....

...HEAVY RAINS AND LOCALIZED FLASH FLOODING EXPECTED OVER
SOUTHEAST COLORADO...

SHOWERS AND THUNDERSTORMS WILL CONTINUE TO FIRE UP WITHIN A MOIST
AND UNSTABLE AIRMASS IN PLACE FROM THE GREAT LAKES AND OHIO VALLEY
INTO THE NORTHEAST AND MID-ATLANTIC STATES.  A RATHER ROBUST PIECE
OF ENERGY DIVING DOWN FROM CANADA SHOULD HELP ORGANIZE SOME OF THE
THUNDERSTORM ACTIVITY...ESPECIALLY AHEAD OF A STRENGTHENING
SURFACE LOW AND COLD FRONT CROSSING THE CENTRAL APPALACHIANS ON
SUNDAY AND PUSHING INTO THE NORTHERN MID-ATLANTIC STATES SUNDAY
NIGHT.  DEVELOPING STORMS COULD CONTAIN HEAVY DOWNPOURS...DAMAGING
WINDS...LARGE HAIL...AND EVEN AN ISOLATED TORNADO.  HEAVY RAINS
AND STRONG STORMS WILL CONTINUE TO BE A POSSIBILITY WITH THIS
SYSTEM AS IT LIFTS THROUGH THE NORTHEAST ON MONDAY.  FARTHER
SOUTH...THE COLD FRONT WILL HELP TRIGGER SCATTERED SHOWERS AND
THUNDERSTORMS WHILE DROPPING THROUGH THE SOUTHERN TIER OF THE
NATION.

A STRONG SURFACE HIGH SETTING UP OVER THE NORTH CENTRAL U.S. WILL
BRING ANOTHER ROUND REFRESHING CANADIAN AIR INTO THE UPPER MIDWEST
ON SUNDAY.  THE COOLER AND DRIER CONDITIONS WILL SPREAD
SOUTHEASTWARD THROUGH MUCH OF THE CENTRAL AND EASTERN U.S. EARLY
THIS WEEK.

MONSOONAL MOISTURE WILL CONTINUE TO FUEL WIDESPREAD CONVECTION
ACROSS THE SOUTHWEST AND CENTRAL ROCKIES SUNDAY AND MONDAY
AFTERNOONS.  LOCALIZED AREAS OF FLASH FLOODING WILL BE POSSIBLE
ACROSS SOUTHEAST COLORADO...WHERE THE MOISTURE WILL INTERACT WITH
A FRONTAL BOUNDARY STRETCHED ALONG THE FRONT RANGE TO PRODUCE
ORGANIZED AREAS OF HEAVY RAINS.  FARTHER NORTH...TEMPERATURES WILL
BE ON THE RISE IN THE NORTHERN ROCKIES AND NORTHERN INTERMOUNTAIN
WEST AS AN EXPANSIVE UPPER RIDGE SPRAWLED ACROSS THE SOUTH CENTRAL
U.S. BUILDS NORTHWARD THROUGH THE REGION.


GERHARDT



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