SWODY2
SPC AC 291722
DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1222 PM CDT THU SEP 29 2011
VALID 301200Z - 011200Z
...NO SVR TSTM AREAS FORECAST...
...SYNOPSIS...
WITHIN A HIGHLY AMPLIFIED LONGWAVE REGIME...AN EXTENSIVE UPPER
TROUGH WILL CONTINUE TO AMPLIFY OVER THE EASTERN THIRD OF THE CONUS
ON FRIDAY...WITH SEVERAL EMBEDDED PIECES OF THIS TROUGH MOVING
NORTHEASTWARD OVER THE GREAT LAKES/CANADA WHILE A SECONDARY PORTION
DIGS SOUTHEASTWARD/CLOSES OFF OVER THE OH VALLEY/CENTRAL
APPALACHIANS. AN ASSOCIATED COLD FRONT WILL MOVE EAST-SOUTHEASTWARD
OFF THE MAJORITY OF THE EASTERN SEABOARD BY
AFTERNOON/EVENING...WHILE EXTENSIVE SURFACE HIGH PRESSURE /AND AN
ASSOCIATED COOL STABLE AIRMASS/ OTHERWISE BUILDS ACROSS THE MIDWEST.
PRIOR TO CLEARING THE EASTERN CONUS...TSTMS WILL BE POSSIBLE
ALONG/JUST AHEAD OF THE AFOREMENTIONED COLD FRONT...INCLUDING AREAS
SUCH AS FL AND THE CAROLINAS /WHERE MARGINAL MOISTURE AND WEAK LAPSE
RATES ALOFT SHOULD PRECLUDE A SEVERE THREAT/. TSTMS WILL ALSO BE
POSSIBLE ACROSS FAR SOUTH/SOUTHWEST TX NEAR THE SOUTHWARD-MOVING
PORTION OF THIS SAME FRONT. OTHER ISOLATED TO SCATTERED TSTMS WILL
BE POSSIBLE ACROSS THE WESTERN STATES ON THE IMMEDIATE PERIPHERY OF
THE FOUR CORNERS UPPER RIDGE...INCLUDING AREAS SUCH AS THE FOUR
CORNERS/DESERT SOUTHWEST/GREAT BASIN AND THE INTERIOR NORTHWEST.
..GUYER.. 09/29/2011
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