Saturday, December 19, 2009

DAY1SVR: Day 1 Convective Outlook

ACUS01 KWNS 191945
SWODY1
SPC AC 191944

DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0144 PM CST SAT DEC 19 2009

VALID 192000Z - 201200Z

...NO TSTM AREAS FORECAST...

...SYNOPSIS...
DEEPENING SURFACE CYCLONE/NOREASTER JUST OFF THE MID-ATLANTIC COAST
WILL CONTINUE MOVING SLOWLY NNEWD...BRINGING CONTINUED WIDESPREAD
WINTER WEATHER TO THIS REGION. ELSEWHERE...RIDGING ALOFT WILL
REMAIN OVER THE WRN HALF OF THE CONUS...UPSTREAM OF THE ERN TROUGH.

ASIDE FROM A LIGHTNING STRIKE OR TWO WITHIN REGION OF STRONG ASCENT
ASSOCIATED WITH THE NERN U.S. STORM SYSTEM...THUNDERSTORMS ARE NOT
ANTICIPATED.

..GOSS.. 12/19/2009

.PREV DISCUSSION... /ISSUED 1029 AM CST SAT DEC 19 2009/

...SYNOPSIS...
EAST COAST CYCLONE/BOMB FORECAST TO REMAIN ON OFFSHORE TRACK FROM
EAST OF DELMARVA TO EAST OF LONG ISLAND THROUGH EARLY SUNDAY.
CONTINENTAL POLAR AIR MASS AND STABLE CONDITIONS BLANKET MUCH OF THE
REST OF CONUS AND WILL PRECLUDE TSTM DEVELOPMENT.

INTENSE DYNAMICS/ASCENT ASSOCIATED WITH THE NOREASTER...ACTING ON
POCKETS OF WEAK INSTABILITY...COULD LEAD TO SPORADIC/BRIEF
THUNDERSNOW. THIS WAS RECENTLY INDICATED IN AN OBSERVATION FROM
QUANTICO VA (KNYG). THIS ACTIVITY WILL LIKELY REMAIN SHORT-LIVED AND
TOO LIMITED IN AREAL COVERAGE TO WARRANT A TSTM OUTLOOK.

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