SWODY3
SPC AC 190720
DAY 3 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0220 AM CDT SUN SEP 19 2010
VALID 211200Z - 221200Z
...SYNOPSIS...
PROGRESSIVE UPPER FLOW PATTERN IS PROGGED THIS PERIOD...AS A SERIES
OF SMALL-SCALE SHORT-WAVE TROUGHS AFFECT THE GREAT LAKES REGION AND
A SECOND/MORE SUBSTANTIAL TROUGH CROSSES THE ERN PACIFIC AND REACHES
THE W COAST LATE.
AT THE SURFACE...A COLD FRONT WILL MOVE QUICKLY EWD ACROSS
ONTARIO/QUEBEC AND THE UPPER GREAT LAKES REGION...WHILE THE TRAILING
PORTION OF THIS BOUNDARY MOVES MORE SLOWLY SEWD ACROSS THE
MIDWEST/SWD ACROSS THE CENTRAL PLAINS.
...IA/NRN MO AND SURROUNDING AREAS...
AFTERNOON HEATING IS PROGGED TO YIELD MODEST DESTABILIZATION NEAR
AND AHEAD OF THE COLD FRONT...EXPECTED TO BE MOVING SLOWLY SEWD
ACROSS SRN WI/IL/IA/SERN NEB DURING THE AFTERNOON. WHILE SOME
CONVECTION MAY BE ONGOING INVOF THIS FRONT...AN INCREASE IN SHOWERS
AND THUNDERSTORMS IS EXPECTED IN CONJUNCTION WITH AFTERNOON
DESTABILIZATION...WITH STORMS EXPECTED TO SHIFT SEWD WITH TIME IN
CONJUNCTION WITH THE ADVANCING FRONT.
WITH A BELT OF MODERATE WSWLYS AT MID LEVELS EXPECTED TO RESIDE ATOP
THE FRONTAL ZONE...POTENTIAL APPEARS TO EXIST FOR STORMS TO
INTENSIFY LOCALLY. ISOLATED STRONGER CELLS SHOULD BECOME CAPABLE OF
PRODUCING HAIL AND/OR LOCALLY-DAMAGING WINDS...BEFORE WEAKENING
AFTER SUNSET WITH THE ONSET OF DIURNAL COOLING.
..GOSS.. 09/19/2010
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