Prognostic Meteorological Discussion
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000
FXUS01 KWBC 292101
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
500 PM EDT TUE JUL 29 2014

VALID 00Z WED JUL 30 2014 - 00Z FRI AUG 01 2014

...HEAVY SHOWERS AND THUNDERSTORMS EXPECTED TO SPREAD FROM THE
CENTRAL ROCKIES EASTWARD INTO OKLAHOMA AND TEXAS PANHANDLE...

...UNUSUALLY COOL WEATHER CONTINUES TO DOMINATE MUCH OF THE
EASTERN HALF OF THE NATION...

DURING THE SHORT-TERM FORECAST PERIOD, AN UNUSUALLY BROAD AND DEEP
UPPER-LEVEL TROUGH WILL CONTINUE TO DOMINATE THE WEATHER ACROSS
MUCH OF THE EASTERN HALF OF THE COUNTRY.  TEMPERATURES UNDERNEATH
THIS UPPER TROUGH WILL REMAIN UNUSUALLY COOL FOR MID-SUMMER.
CONDITIONS WILL BE VERY PLEASANT ACROSS A WIDE AREA FROM THE
MISSISSIPPI VALLEY EASTWARD THROUGH MUCH OF THE EAST COAST.
TYPICAL SUMMER HEAT AND HUMIDITY, ALONG WITH A CHANCE OF SHOWERS
AND THUNDERSTORMS, WILL BE CONFINED WELL TO THE SOUTH ALONG THE
GULF COAST AND INTO FLORIDA.  OVER THE GREAT LAKES, WHERE IT IS
CLOSEST TO THE UPPER-LEVEL LOW CENTER IN SOUTHERN CANADA,
INSTABILITIES WILL LEAD TO SCATTERED SHOWERS AND THUNDERSTORMS
WITH VERY COOL TEMPERATURES.

THE BELOW NORMAL TEMPERATURES WILL EXTEND WESTWARD INTO A GOOD
PORTION OF THE ROCKIES WHERE MONSOONAL TYPE SHOWERS AND
THUNDERSTORMS WILL BE THE RULE OVER THE NEXT FEW DAYS.  AN
UPPER-LEVEL IMPULSE IS FORECAST TO MOVE ACROSS COLORADO TONIGHT.
THIS FEATURE WILL GENERATE ITS OWN POOL OF COOL AIR AND WILL
PROMOTE ADDITIONAL SHOWERS AND THUNDERSTORMS TO SPREAD EASTWARD
INTO THE CENTRAL PLAINS, ESPECIALLY OKLAHOMA AND TEXAS PANHANDLE.
SOME OF THE RAINS CAN BECOME HEAVY AND COULD LEAD TO FLASH
FLOODING IN SOME AREAS.  THE CLOUDS AND RAINS WILL LEAD TO EVEN
COOLER TEMPERATURES OF MORE THAN 20 DEGREES BELOW NORMAL IN
EASTERN COLORADO ON WEDNESDAY.  THE COOL POOL OF AIR WILL THEN
SPREAD SOUTH ACROSS MUCH OF TEXAS ON THURSDAY.

THE ONLY AREA WHERE TEMPERATURES ARE EXPECTED TO BE SIGNIFICANTLY
ABOVE NORMAL WILL BE IN THE PACIFIC NORTHWEST INTO THE NORTHERN
ROCKIES WHERE LITTLE OR NO PRECIPITATION IS EXPECTED.

KONG


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