Saturday, July 26, 2008

DAY48SVR: Nws Storm Prediction Center Norman Ok

ACUS48 KWNS 260836
SWOD48
SPC AC 260835

DAY 4-8 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0335 AM CDT SAT JUL 26 2008

VALID 291200Z - 031200Z

...SVR STORMS POSSIBLE TUE ACROSS MT/PARTS OF THE GREAT LAKES...

A THERMODYNAMIC AND KINEMATIC ENVIRONMENT SUPPORTIVE OF ORGANIZED
STORM CLUSTERS IS EXPECTED TO PERSIST INTO TUESDAY NEAR A BELT OF
STRONGER WESTERLIES ALONG THE CANADIAN/U.S. BORDER AREA...FROM THE
ROCKIES INTO THE GREAT LAKES REGION. AND...LARGE-SCALE FORCING
ASSOCIATED WITH AN IMPULSE LIFTING OUT OF THE TROUGH ACROSS THE
PACIFIC NORTHWEST COAST REGION...THROUGH THE NORTHERN ROCKIES...
WILL PROBABLY ENHANCE THIS POTENTIAL...AS WILL A DOWNSTREAM IMPULSE
AND SURFACE WAVE MIGRATING EAST OF THE UPPER MISSISSIPPI VALLEY
THROUGH THE GREAT LAKES REGION. MEDIUM RANGE FORECAST GUIDANCE IS
REASONABLY SIMILAR WITH THESE FEATURES THROUGH EARLY NEXT WEEK.
THEREAFTER...HOWEVER...UNCERTAINTIES GROW CONSIDERABLY WITH REGARD
TO DEVELOPMENTS WITHIN THE WESTERLIES...AND ASSOCIATED CONVECTIVE
POTENTIAL.

..KERR.. 07/26/2008

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