SWODY1
SPC AC 041950
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0150 PM CST SUN NOV 04 2007
VALID 042000Z - 051200Z
..NO TSTM AREAS FORECAST...
..SYNOPSIS...
A MID-LEVEL SHORT-WAVE TROUGH WILL CONTINUE CROSSING THE NERN U.S.
THROUGH THE PERIOD...WHILE A SECOND SHORT-WAVE TROUGH DIGS SEWD
ACROSS THE NRN PLAINS. THIS WILL RESULT IN THE MAINTENANCE OF A
LONG-WAVE TROUGH OVER THE ERN HALF TO 2/3 OF THE CONUS THROUGH THE
PERIOD. MEANWHILE...A RIDGE WILL PERSIST OVER THE WEST...WITH AN
UPPER LOW LINGERING OFF THE CA COAST.
AT THE SURFACE...A COLD FRONT WILL CONTINUE SURGING SWD ACROSS THE
NRN AND EVENTUALLY THE CENTRAL PLAINS...WHILE MOVING SEWD ACROSS THE
UPPER MS VALLEY AS THE ASSOCIATED LOW REACHES LAKE SUPERIOR BY THE
END OF THE PERIOD.
WITH RELATIVELY COOL AND STABLE AIR OVER THE CONUS...THUNDER THREAT
SHOULD REMAIN VIRTUALLY NON-EXISTENT. ONE POSSIBLE EXCEPTION MAY
OCCUR OVER THE WRN UPPER GREAT LAKES LATE...AS COLD AIR ALOFT IN A
POST-FRONTAL SURFACE REGIME SHOULD YIELD AMPLE SHALLOW INSTABILITY
FOR LAKE-EFFECT CONVECTION AND PERHAPS A STRAY LIGHTNING STRIKE.
.GOSS.. 11/04/2007
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