SWODY3
SPC AC 110748
DAY 3 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0148 AM CST SUN JAN 11 2009
VALID 131200Z - 141200Z
...NO SVR TSTM AREAS FORECAST...
...SYNOPSIS...
A LONGWAVE TROUGH WILL BE MAINTAINED OVER THE ERN TWO-THIRDS OF THE
U.S. THROUGH TUESDAY...DOWNSTREAM OF A STRONG RIDGE EXTENDING N-S
ALONG THE COAST OF WRN NORTH AMERICA. THE ERN TROUGH SHOULD EVOLVE
INTO A MORE BROAD LONGWAVE TROUGH. THIS WILL OCCUR AS PHASED SHORT
WAVE TROUGHS PROGRESS EWD FROM THE MS VALLEY TO OFF THE ATLANTIC
COAST BY LATE IN THE PERIOD...AND HEIGHTS FALL OVER THE SRN ROCKIES
AS ADDITIONAL IMPULSES TRACK SEWD INTO THE TROUGH.
...S FL...
A FRONT SHOULD BE STALLED ACROSS FAR S FL AT 12Z TUESDAY.
MEANWHILE...A SURFACE LOW FORMING OFFSHORE THE SRN ATLANTIC STATES
IS EXPECTED TO REMAIN OFF THE COAST AS IT TRACKS NNEWD WITH THE
APPROACH OF THE MS VALLEY TROUGH. A BOUNDARY TRAILING SSWWD FROM
THIS LOW WILL MOVE THROUGH AND OFFSHORE OF SRN FL BY TUESDAY
EVENING. DESPITE THE POTENTIAL FOR SOME SHOWERS AND POSSIBLE TSTMS
ACROSS S FL...GIVEN DIABATIC HEATING WITHIN A MOIST BOUNDARY
LAYER...WEAK MID LEVEL LAPSE RATES/INSTABILITY AND WEAK FORCING
ALOFT SHOULD PRECLUDE A SEVERE WEATHER THREAT.
ELSEWHERE ACROSS THE CONUS...A STABLE AIR MASS WILL PRECLUDE THE
DEVELOPMENT OF DEEP MOIST CONVECTION.
..PETERS.. 01/11/2009
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