128 
FXUS01 KWBC 271959
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
358 PM EDT TUE AUG 27 2013

VALID 00Z WED AUG 28 2013 - 00Z FRI AUG 30 2013

...EXCESSIVE HEAT CONTINUES ACROSS THE NORTH CENTRAL U.S....

...STORMS LIKELY FROM THE GREAT LAKES TO THE NORTH
EAST/MID-ATLANTIC...

...SHOWERS AND THUNDERSTORMS FROM THE SOUTHWEST TO THE
INTERMOUNTAIN WEST/PACIFIC NORTHWEST...


THE LATE SUMMER HEAT WAVE WILL CONTINUE ACROSS MUCH OF THE NORTH
CENTRAL U.S. OVER THE NEXT FEW DAYS AS THIS REGION REMAINS PARKED
UNDERNEATH THE EXPANSIVE UPPER RIDGE OVER THE CENTRAL U.S..
EXCESSIVE HEAT WARNINGS AND HEAT ADVISORIES REMAIN IN EFFECT FROM
THE CENTRAL PLAINS TO THE UPPER MIDWEST WHERE HIGH TEMPERATURES
AND UNCOMFORTABLE DEW POINTS BRING HEAT INDICES SOARING INTO THE
TRIPLE DIGITS. ADDITIONALLY, WEAK ENERGY MOVING UP AND OVER THE
RIDGE SHOULD BRING ABOUT SOME SHOWERS AND THUNDERSTORMS, POSSIBLY
HEAVY AT TIMES, AS IT TRACKS FROM THE UPPER GREAT LAKES TO THE
NORTHERN MID-ATLANTIC AND NORTHEAST. ON WEDNESDAY AFTERNOON AND
EVENING, A SECOND PIECE OF ENERGY ROUNDING THE UPPER RIDGE, COULD
HELP TO IGNITE SOME STORMS ACROSS THE NORTHERN PLAINS INTO THE
UPPER MIDWEST.  

OUT IN THE WEST, AN UPPER LEVEL TROUGH OVER THE NORTHEAST PACIFIC
OCEAN SHOULD CONTINUE TO BRING RAIN TO COASTAL REGIONS OF THE
PACIFIC NORTHWEST ON WEDNESDAY AND THURSDAY. FARTHER SOUTH, PLENTY
OF MOISTURE CONTINUES TO BE PULLED UP BETWEEN THE TROUGH TO THE
WEST AND RIDGE TO THE EAST WHICH WILL KEEP SHOWERS AND
THUNDERSTORMS IN THE FORECAST FOR MUCH OF THE SOUTHWEST, GREAT
BASIN, AND CENTRAL ROCKIES. A FEW OF THE STORMS, MAINLY IN THE
SOUTHWEST, COULD CONTAIN SOME LOCALLY HEAVIER RAIN.

   
GERHARDT/MONARSKI


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