SWODY3
SPC AC 190729
DAY 3 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0229 AM CDT THU MAR 19 2009
VALID 211200Z - 221200Z
...NO SVR TSTM AREAS FORECAST...
...SYNOPSIS...
LARGE-SCALE RIDGING WILL PREVAIL ACROSS MOST OF THE ERN 2/3 OF THE
U.S. THIS PERIOD...THOUGH A TROUGH DIGGING ACROSS ERN CANADA WILL
AFFECT NEW ENGLAND LATE. MEANWHILE...A LARGE/DIGGING TROUGH WILL
AFFECT THE WRN THIRD OF THE CONUS.
AT THE SURFACE...HIGH PRESSURE WILL CONTINUE TO PREVAIL ACROSS MOST
OF THE U.S. E OF THE MS RIVER. FARTHER W...A COLD FRONT WILL
CONTINUE MOVE ACROSS THE WRN U.S. IN ADVANCE OF THE DIGGING UPPER
TROUGH...WITH BROAD LOW PRESSURE EXPECTED TO BEGIN CONSOLIDATING
LATE OVER THE HIGH PLAINS.
SHOWERS AND THUNDERSTORMS ARE FORECAST ACROSS A LARGE PORTION OF THE
WEST...AS THE UPPER TROUGH APPROACHES. HOWEVER...WEAK INSTABILITY
IN MOST AREAS SUGGESTS LITTLE IF ANY SEVERE THREAT.
SHOWERS AND STORMS SHOULD SPREAD INTO PARTS OF THE NRN HALF OF THE
PLAINS LATE...AS LOW-LEVEL WARM ADVECTION DRIVES AN EXPANSION IN
PRECIPITATION. AGAIN HOWEVER...LACK OF INSTABILITY SHOULD PRECLUDE
APPRECIABLE SEVERE POTENTIAL.
..GOSS.. 03/19/2009
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