SWODY2
SPC AC 231729
DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1129 AM CST MON FEB 23 2009
VALID 241200Z - 251200Z
...NO TSTM AREAS FORECAST...
...DISCUSSION...
PROGRESSIVE LOW AMPLITUDE PATTERN WILL PREVAIL THROUGH TUESDAY.
UPPER TROUGH OFF THE PACIFIC NW COAST IS FORECAST TO EJECT EWD
THROUGH THE NRN ROCKIES TUESDAY...REACHING THE NRN PLAINS AND UPPER
MS VALLEY BY THE END OF THE PERIOD.
...NRN ROCKIES...
STEEPER MID LEVEL LAPSE RATES AND ASCENT ATTENDING THE SHORTWAVE
TROUGH EXPECTED TO MOVE THROUGH THE PACIFIC NW AND NRN ROCKIES MAY
CONTRIBUTE TO DEVELOPMENT OF ISOLATED CONVECTION OVER PARTS OF THE
NRN ROCKIES DURING THE AFTERNOON. HOWEVER...COVERAGE WILL LIKELY
REMAIN AOB 10% DUE TO LIMITED INSTABILITY.
...SRN PLAINS AND LOWER MS VALLEY...
LOW-LEVEL TRAJECTORIES EMANATING FROM A LARGE AREA OF HIGH PRESSURE
OVER THE SERN STATES WILL MAINTAIN A RELATIVELY DRY BOUNDARY LAYER
OVER THE GULF. AN AXIS OF MODIFIED CP AIR WILL BEGIN RETURNING NWD
THROUGH ERN TX LATER TUESDAY AS THE SURFACE RIDGE RETREATS AND A LEE
TROUGH DEVELOPS OVER THE PLAINS. HOWEVER...THE MOISTURE RETURN WILL
LIKELY REMAIN INSUFFICIENT FOR SIGNIFICANT DESTABILIZATION.
..DIAL.. 02/23/2009
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