000
FXUS01 KWBC 062157
PMDSPD
 
SHORT RANGE FORECAST DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
557 PM EDT MON JUL 06 2009
 
VALID 00Z TUE JUL 07 2009 - 12Z WED JUL 08 2009
 
THE FIRST FULL WEEK OF JULY WILL BEGIN WITH TWO CLOSED UPPER-LEVEL
LOWS MAINTAINING THEIR QUASI-STATIONARY CHARACTERISTICS OVER BOTH
THE NORTHEAST AND NORTHWEST U.S. DUE TO ONE OF THESE LOWS...THE
NORTHEAST IS EXPECTED TO EXPERIENCE RAIN AND THUNDERSTORMS ALONG
WITH COOLER SURFACE TEMPERATURES THROUGH WEDNESDAY.  THE OTHER
CLOSED UPPER-LEVEL LOW WILL USHER IN A BROAD SWATH OF
PRECIPITATION FOCUSED MOSTLY NORTH OF THE U.S. BORDER... HOWEVER
UPSLOPE DRIVEN PRECIPITATION IS EXPECTED FARTHER SOUTH ALONG THE
PACIFIC NORTHWEST COAST. THIS WILL OCCUR AS MOISTURE IS TAPPED
FROM THE PACIFIC... ACCOMPANYING A FRONTAL BOUNDARY AS IT
TRAVERSES INLAND. HEAVIER RAIN AND THUNDERSTORMS INITIALLY ARE
POSSIBLE IN SOUTHWESTERN CANADA SPURRED BY LIFTING FROM A LOW
PRESSURE CENTER...BUT HEAVIER PRECIPITATION ALSO IS POSSIBLE ALONG
A FRONT STRETCHING FROM THE NORTHERN PLAINS AND INTO THE MIDWEST
BY WEDNESDAY.

MEANWHILE...A VERY PERSISTENT FRONTAL BOUNDARY THAT HAS BEEN
HOLDING ITS OWN ACROSS THE SOUTHEAST U.S. FOR THE PAST SEVERAL
DAYS AGAIN IS EXPECTED TO INITIATE RAIN AND THUNDERSTORMS ACROSS
THE REGION THROUGH THE SHORT RANGE PERIOD. AS GULF MOISTURE
CONTINUES TO BE TAPPED...LOCALLY HEAVY PRECIPITATION MAY OCCUR
ACROSS THE GULF STATES. HIGH TEMPERATURES IN THIS AREA MAY RANGE
FROM THE MID 80S THROUGH THE 90S THROUGH WEDNESDAY...WHILE
TEMPERATURES NEAR THE 100 DEGREE MARK ARE EXPECTED TO CREEP
NORTHWARD LATER THIS WEEK FROM THE SOUTHERN TO CENTRAL PLAINS AS
HIGH PRESSURE CONTINUES TO DOMINATE THIS REGION.

KOST


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