SWODY2
SPC AC 270530
DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1230 AM CDT MON OCT 27 2008
VALID 281200Z - 291200Z
...NO TSTM AREAS FORECAST...
...SYNOPSIS AND FORECAST...
LARGE-SCALE TROUGH OVER THE ERN CONUS WILL EVOLVE INTO A CLOSED LOW
OVER NEW ENGLAND INTO QUEBEC AS INTENSE MID AND UPPER-LEVEL JET
STREAKS PROPAGATE FROM THE TROUGH BASE NWD INTO THE CANADIAN
MARITIMES. MEANWHILE...UPSTREAM SHORT WAVE TROUGH WILL TEND TO
DE-AMPLIFY WHILE TRANSLATING FROM THE NRN CA/ORE COASTS INTO
INTERIOR PORTIONS OF THE W...THROUGH LONG WAVE RIDGE AXIS.
IN THE LOW LEVELS...SURFACE LOW INITIALLY OFF THE MIDDLE ATLANTIC
COAST WILL UNDERGO CONSIDERABLE DEEPENING WHILE DEVELOPING NWD AND
THEN NWWD THROUGH NEW ENGLAND INTO QUEBEC. ELSEWHERE...AN EXPANSIVE
RIDGE AXIS WILL PERSIST ALONG THE MS RIVER VALLEY INTO THE GULF OF
MEXICO WHILE A LEE TROUGH DEEPENS OVER THE NRN AND CNTRL HIGH
PLAINS.
OVER NEW ENGLAND...INTENSE FORCING FOR ASCENT AND NWWD LOW-LEVEL
MOISTURE TRANSPORT INVOF INTENSIFYING...DEEP-LAYER CYCLONE WILL
CONTRIBUTE TO POCKETS OF VERY WEAK CONVECTIVE INSTABILITY WITHIN
SYSTEM WARM CONVEYOR BELT. AS SUCH...POTENTIAL WILL EXIST FOR A FEW
EMBEDDED...DEEPER CONVECTIVE ELEMENTS CAPABLE OF ISOLATED LIGHTNING
STRIKES. CURRENTLY...THIS THREAT APPEARS TOO MARGINAL TO WARRANT
INCLUSION OF A GENERAL THUNDER AREA.
..MEAD.. 10/27/2008
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