SWODY1
SPC AC 170502
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1202 AM CDT SAT APR 17 2010
VALID 171200Z - 181200Z
...NO SVR TSTM AREAS FORECAST...
...SYNOPSIS...
BLOCKING PATTERN WILL REMAIN OVER THE COUNTRY SATURDAY WITH UPPER
LOW OVER THE ERN STATES...A RIDGE OVER THE CNTRL U.S. AND A TROUGH
IN THE WEST. COMPACT SRN PLAINS UPPER LOW WILL DRIFT SLOWLY EWD. AT
THE SURFACE A COLD FRONT INITIALLY FROM THE CAROLINAS THROUGH NRN TX
WILL ADVANCE SWD DURING THE DAY.
...SRN PLAINS...
SCATTERED CONVECTION WILL PERSIST WITHIN PLUME OF DEEP SUBTROPICAL
MOISTURE EAST OF UPPER LOW FROM SRN TX NWD THROUGH OK. WEAK LAPSE
RATES ASSOCIATED WITH MOIST-ADIABATIC PROFILES WILL LIMIT UPDRAFT
STRENGTH AND OVERALL COVERAGE OF THUNDERSTORMS. COVERAGE MAY BE A
LITTLE GREATER IN S TX WHERE HIGHER BOUNDARY LAYER DEWPOINTS WILL
RESULT IN GREATER INSTABILITY.
...SRN THROUGH NRN ROCKIES...
UPPER TROUGH ALONG WITH SEVERAL EMBEDDED VORTICITY MAXIMA WILL MOVE
EWD THROUGH THE ROCKIES. PLUME OF MID-UPPER LEVEL MOISTURE AHEAD OF
TROUGH AXIS...AREAS OF DEEPER ASCENT ASSOCIATED WITH THE VORTICITY
MAXIMA AND STEEP MID-LEVEL LAPSE RATES WILL PROMOTE CONVECTIVE
DEVELOPMENT OVER THE HIGHER TERRAIN DURING THE AFTERNOON. LIMITED
INSTABILITY SUGGESTS THUNDERSTORM COVERAGE SHOULD REMAIN ISOLATED TO
WIDELY SCATTERED.
..DIAL/SMITH.. 04/17/2010
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