SWODY1
SPC AC 060540
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1240 AM CDT SUN SEP 06 2009
VALID 061200Z - 071200Z
...NO SVR TSTM AREAS FORECAST...
...SYNOPSIS...
ASIDE FROM AN UPPER TROUGH FORECAST TO MOVE INLAND ACROSS THE NWRN
U.S./WRN CANADA THIS PERIOD...THE FLOW PATTERN ALOFT ACROSS THE
REMAINDER OF THE U.S. IS FORECAST TO BE GENERALLY WEAK/NONDESCRIPT.
THUNDERSTORMS ARE AGAIN FORECAST ACROSS PORTIONS OF THE ROCKIES AND
SWD INTO AZ/NM...AHEAD OF A WEAK LEAD FEATURE PRECEDING THE MAIN
NWRN TROUGH. CONVECTION IS ALSO EXPECTED ACROSS A ZONE CENTERED
ALONG THE MID AND LOWER MS VALLEY REGION AND EXTENDING EWD INTO THE
OH VALLEY...AS SEVERAL SMALL-SCALE MID-LEVEL CIRCULATION CENTERS
MOVE SLOWLY EWD. STORMS ARE ALSO FORECAST ACROSS FL AND PARTS OF
TX...AND ACROSS PORTIONS OF THE PAC NW AS THE MAIN TROUGH MOVES
ONSHORE.
WEAK INSTABILITY ACROSS THE PAC NW SHOULD PRECLUDE ANY SEVERE
THREAT...WHILE ELSEWHERE AMPLE INSTABILITY BUT WEAK FLOW ALOFT
SUGGESTS NO MORE THAN MARGINAL/ISOLATED/PULSE-TYPE THREAT DURING THE
AFTERNOON CONVECTIVE MAXIMUM.
..GOSS.. 09/06/2009
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