SWODY2
SPC AC 160549
DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1249 AM CDT WED SEP 16 2009
VALID 171200Z - 181200Z
...NO SVR TSTM AREAS FORECAST...
...SYNOPSIS...
DEAMPLIFICATION IS FORECAST WITHIN THE MID-LEVEL FLOW FIELD ACROSS
THE NRN CONUS...AS THE WRN TROUGH WEAKENS/SHIFTS ENEWD TOWARD THE
CANADIAN PRAIRIE AND IMPINGES ON THE STRONG DOWNSTREAM RIDGE.
MEANWHILE...THE MEAN TROUGH OVER THE NORTHEAST WILL REMAIN...THOUGH
DEAMPLIFYING SOME AS SHORT-WAVE ENERGY SHIFTS E OF NEW ENGLAND
THROUGH THE PERIOD.
ELSEWHERE...TWO MID-LEVEL LOWS WITHIN THE LONG-WAVE RIDGE PREVAILING
ACROSS THE CONUS WILL MAINTAIN THEIR IDENTITY THROUGH THE PERIOD --
THE WRN FEATURE DRIFTING OUT OF AZ AND INTO NM...AND THE ERN ONE
MOVING SLOWLY EWD FROM E TX/WRN LA TOWARD THE LOWER MS VALLEY
THROUGH THE PERIOD.
SHOWERS AND THUNDERSTORMS ARE FORECAST TO INCREASE THROUGH THE
AFTERNOON ACROSS PARTS OF UT/CO/AZ/NM...AHEAD OF THE WRN UPPER LOW.
SHOWERS AND STORMS WILL ALSO BE WIDESPREAD ACROSS THE SOUTHEAST
QUARTER OF THE COUNTRY IN CONJUNCTION WITH THE ERN UPPER LOW...AND
SCATTERED ACROSS PARTS OF ID/MT AHEAD OF THE UPPER TROUGH MOVING
TOWARD THE CANADIAN PRAIRIE. IN ALL THREE AREAS...CAPE/SHEAR
COMBINATION APPEARS UNSUPPORTIVE OF APPRECIABLE SEVERE POTENTIAL.
..GOSS.. 09/16/2009
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