SWOD48
SPC AC 300850
DAY 4-8 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0350 AM CDT WED JUL 30 2008
VALID 021200Z - 071200Z
...SVR STORMS POSSIBLE ACROSS THE UPR MS VLY/GREAT LAKES SAT/SUN...
MEDIUM RANGE FORECAST GUIDANCE...INCLUDING THE ECMWF AND MREF...
CONTINUE TO INDICATE THE RELATIVELY HIGH LIKELIHOOD THAT A STRONG
SHORT WAVE IMPULSE WILL APPROACH AND PROGRESS THROUGH THE CREST OF
THE SUBTROPICAL RIDGE NEAR THE CENTRAL/U.S. CANADIAN BORDER AREA
THIS WEEKEND. FORCING ASSOCIATED WITH THIS FEATURE...INCLUDING THE
DEVELOPMENT OF A SEASONABLY DEEP NORTHERN PLAINS SURFACE LOW...AND
SOUTHERLY LOW-LEVEL JET DIRECTED TOWARD THE UPPER MISSISSIPPI VALLEY
REGION...IS EXPECTED TO CONTRIBUTE TO A FAVORABLE ENVIRONMENT FOR
ORGANIZED CONVECTIVE DEVELOPMENT. GUIDANCE CONTINUES TO INDICATE
SIGNIFICANT POTENTIAL FOR THE COUPLING OF STRONG INSTABILITY AND
DEEP LAYER SHEAR ACROSS THE UPPER MISSISSIPPI VALLEY/GREAT LAKES
REGION...WHICH IS EXPECTED TO PROVE FAVORABLE FOR ONE OR MORE SEVERE
MESOSCALE CONVECTIVE SYSTEMS CAPABLE OF PRODUCING SWATHS OF DAMAGING
WINDS AND HAIL.
..KERR.. 07/30/2008
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