SPC AC 191255
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0655 AM CST TUE FEB 19 2008
VALID 191300Z - 201200Z

...NO SVR TSTM AREAS FORECAST...

...SYNOPSIS/FORECAST...
WRN RIDGE/ERN TROUGH PATTERN WILL EVOLVE TOWARD A SPLIT FLOW REGIME
OVER THE LWR 48 THIS PERIOD AS /1/ TROUGH DEAMPLIFIES IN THE EAST
AND /2/ A SERIES OF IMPULSES BEGIN TO UNDERCUT BLOCKING RIDGE OVER
SW CANADA. AT LWR LEVELS...SHALLOW COLD FRONT ASSOCIATED WITH ERN
TROUGH WILL CLEAR THE FL STRAITS A BIT LATER THIS MORNING. IN WAKE
OF BOUNDARY...DRY CONTINENTAL AIR WILL PREVAIL OVER THE ENTIRE CONUS
WITH THE EXCEPTION OF CSTL CA.
APPROACH OF LEAD IMPULSE IN DEVELOPING SRN STREAM WILL INDUCE
STRENGTHENING OF SLY LLJ OVER CNTRL AND E TX LATER TODAY AND
TONIGHT. WHILE THIS WILL LEAD TO A GRADUAL MOISTENING OF THE
BOUNDARY LAYER ACROSS THE TX GULF CSTL PLN...THIS MOISTURE LIKELY
WILL REMAIN TRAPPED BENEATH EXISTING EML. GIVEN ABSENCE OF A STRONG
LIFTING MECHANISM...POTENTIAL FOR ANY LATE PERIOD THUNDER SHOULD
REMAIN LOW.
ELSEWHERE...THUNDER THREAT WILL END MOMENTARILY FROM NW TO SE ACROSS
EXTREME SE FL AS SHALLOW COLD FRONT CONTINUES SLOWLY SEWD BEYOND THE
KEYS.
..CORFIDI.. 02/19/2008