SWODY2
SPC AC 070638
DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1238 AM CST WED JAN 07 2009
VALID 081200Z - 091200Z
...NO SVR TSTM AREAS FORECAST...
...SYNOPSIS...
LARGE-SCALE PATTERN WILL REMAIN PROGRESSIVE THROUGH THE DAY TWO
PERIOD AS ERN CONUS TROUGH MOVES OFFSHORE AND NEXT UPSTREAM SYSTEM
AMPLIFIES OVER THE WRN STATES. IN THE LOW LEVELS...SURFACE RIDGE
AXIS TRAILING ERN U.S. TROUGH WILL DEVELOP SEWD FROM THE
MIDDLE/LOWER MO VALLEY INTO SERN STATES. AS THIS OCCURS...SURFACE
LOW OVER SRN ALBERTA WILL DEVELOP SEWD INTO THE NRN PLAINS BY FRIDAY
MORNING. A COLD FRONT WILL ACCOMPANY THIS LOW PRESSURE EWD/SEWD
FROM THE PACIFIC NW EVENTUALLY INTO THE NRN AND CNTRL PLAINS BY THE
END OF THE FORECAST PERIOD.
...PACIFIC NW INTO NRN ROCKIES...
CONSIDERABLE DYNAMIC COOLING AND RESULTANT STEEPENING OF LAPSE RATES
WILL ACCOMPANY MIDLEVEL TROUGH MOVING ONSHORE THURSDAY. THIS
FORCING FOR ASCENT AND DESTABILIZATION IS EXPECTED TO SUPPORT THE
DEVELOPMENT OF CONVECTIVE PRECIPITATION ALONG ASSOCIATED COLD
FRONT...NAMELY DURING THE AFTERNOON INTO EVENING. FORECAST
SOUNDINGS SUGGEST THAT SUFFICIENTLY DEEP CONVECTIVE INSTABILITY WILL
DEVELOP SUCH THAT SOME OF THE MORE ROBUST CONVECTIVE ELEMENTS WILL
BE CAPABLE OF SPORADIC LIGHTNING ACTIVITY.
..MEAD.. 01/07/2009
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