Prognostic Meteorological Discussion
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000
FXUS01 KWBC 312101
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
501 PM EDT THU JUL 31 2014

VALID 00Z FRI AUG 01 2014 - 00Z SUN AUG 03 2014

...COOL AND DRY CONDITIONS ALONG THE EAST COAST WILL GIVE WAY TO
HIGHER CHANCE OF RAIN AND THUNDERSTORMS TOWARDS THE WEEKEND...

...SHOWERS AND THUNDERSTORMS LINGER ALONG THE GULF COAST AND INTO
THE SOUTHERN ROCKIES...

THE BOARD AND DEEP UPPER-LEVEL TROUGH THAT HAS PROVIDED UNUSUALLY
COOL MID-SUMMER WEATHER FOR MUCH OF THE EASTERN TWO-THIRDS OF THE
COUNTRY IS EXPECTED TO GRADUALLY WEAKEN OVER THE NEXT COUPLE OF
DAYS.  AS THE TROUGH "LIFTS OUT" OR RETREATS INTO EASTERN CANADA,
RETURN FLOW FROM THE WESTERN ATLANTIC IS EXPECTED TO BRING
INCREASING MOISTURE INTO THE EASTERN SEABOARD BY THE END OF THE
WEEK. SHOWERS AND THUNDERSTORMS, AIDED BY AN UPSLOPE FLOW AHEAD OF
A WARM FRONT, WILL FIRST APPEAR IN THE SOUTHERN APPALACHIANS ON
FRIDAY.  THE PRECIPITATION SHOULD THEN HEAD NORTHWARD AND
OVERSPREAD THE COASTAL MID-ATLANTIC AND INTO SOUTHERN NEW ENGLAND
BY SATURDAY MORNING.  FARTHER WEST ACROSS MUCH OF THE CENTRAL AND
NORTHERN U.S. HOWEVER, CONDITIONS WILL REMAIN COOL AND MOSTLY
RAIN-FREE THROUGH THE REST OF THE WEEK.  A CHANCE OF RAIN AND
THUNDERSTORMS CAN BE EXPECTED IN THE GREAT LAKES DUE TO CLOSE
PROXIMITY TO THE RETREATING UPPER TROUGH.  FARTHER SOUTH, SHOWERS
AND THUNDERSTORMS WILL BE THE RULE NEAR AND SOUTH OF A STALLED
FRONT FROM FLORIDA WESTWARD ALONG THE GULF COAST AND INTO THE
SOUTHERN ROCKIES.

OUT WEST, WIDELY SCATTERED SHOWERS AND THUNDERSTORMS CAN BE
EXPECTED ACROSS THE INTERIOR MOUNTAINS.  SUMMER HEAT WILL
GRADUALLY LOSE ITS GRIP IN THE INTERIOR PACIFIC NORTHWEST INTO THE
NORTHERN ROCKIES DURING THE NEXT FEW DAYS.  OTHERWISE, DRY
CONDITION WILL PREVAIL ALONG THE WEST COAST AND INTO THE DESERT
SOUTHWEST.

KONG


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