5/10/08 Tornado Outbreak Almost Certain Over SE U.S.

[ESipes_89]

There is a very strong storm system over the Southeast U.S. today. A tornado outbreak is almost certain in this area.

Risk area is from E central OK to central GA and from central MS to Southern IL.

Please visit this webpage to see outlook area.

-Eric

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SPC AC 101210

DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0710 AM CDT SAT MAY 10 2008

VALID 101300Z - 111200Z

...THERE IS A MDT RISK OF SVR TSTMS ARKLATEX AND MID SOUTH
REGION EASTWARD ACROSS THE GULF COAST STATES TODAY AND TONIGHT...

...THERE IS A SLGT RISK OF SVR TSTMS SURROUNDING THE MDT RISK FROM
THE SRN PLAINS EWD TO THE ATLANTIC COAST AND NWD TO LOWER OH
VALLEY...

....WIDESPREAD SEVERE THUNDERSTORMS INCLUDING TORNADOES EXPECTED
FROM THE LOWER MS VALLEY EWD ACROSS GULF STATES AND WRN TN VALLEY...


A COMPLEX AND POTENTIALLY DANGEROUS SEVERE WEATHER SITUATION WILL
DEVELOP TODAY AS A VIGOROUS UPPER SYSTEM FROM THE ROCKIES AND
POWERFUL LATE SPRING UPPER JET LEAD TO A RAPIDLY DEEPENING LOW
PRESSURE SYSTEM CENTRAL U.S BEGINNING THIS AFTERNOON.

MOIST AND POTENTIALLY VERY UNSTABLE AIRMASS IS IN PLACE FROM ERN TX
ACROSS GULF STATES TO THE S OF STALLED FRONTAL ZONE FROM NRN GA TO
SRN AR.

PRECEEDING THE ROCKIES UPPER TROUGH A MID LEVEL WIND MAX WILL
QUICKLY CROSS THE SRN PLAINS AND ENHANCE BOTH LIFT AND SHEAR FOR
SEVERE THUNDERSTORM DEVELOPMENT BY EARLY AFTERNOON VICINITY WRN
PORTION OF STALLED FRONTAL ZONE. WITH AN ELEVATED MIXED LAYER IN
PLACE ACROSS THE WARM SECTOR AND STRONG HEATING...MLCAPES WILL
RAPIDLY CLIMB TO ABOVE 2500 J/KG. BY MID AFTERNOON MUCH OF THE WARM
SECTOR S OF FRONT WILL BE RIPE FOR THUNDERSTORM DEVELOPMENT.
SUPERCELLS INCLUDING BOTH TORNADOES AND LARGE HAIL WILL BE MOST
LIKELY AHEAD OF THE WIND MAX VICINITY FRONTAL ZONE SRN AR. 60-70KT
OF DEEP LAYER SHEAR COUPLED WITH THE INSTABILITY WILL CREATE
CONDITIONS FAVORABLE FOR LONG LIVED SUPERCELLS INCLUDING THREAT OF
STRONG TORNADOES. ORGANIZED STORMS/SUPERCELLS WILL MOVE RAPIDLY EWD
UNDER THE STRONG JET MAX ACROSS MS/AL TO GA TONIGHT. THIS COMPLEX
COULD EVOLVE INTO A DERECHO TYPE SYSTEM WITH AN ENHANCED WIND DAMAGE
POTENTIAL. ADDITIONAL SEVERE STORMS ARE LIKELY IN ADVANCE OF THE
MORE ORGANIZED THREAT ACROSS THE INTERIOR GULF STATES THIS AFTERNOON
GIVEN THE AVAILABLE SHEAR/INSTABILITY IN PLACE.

AS THE SURFACE LOW BEGINS THE DEEPENING PROCESS OVER ERN KS THIS
AFTERNOON...LOW LEVEL MOISTURE WILL RAPIDLY SPREAD NEWD ACROSS LOWER
MO INTO LOWER OH VALLEYS. SEVERE THUNDERSTORMS WILL INITIALLY
DEVELOP AHEAD OF THE SURFACE LOW AND ALONG THE COLD FRONT EXPENDING
SWD INTO ERN OK/NRN TX. VERY IMPRESSIVE DEEPENING OF THE SURFACE
AND UPPER LOW FORECASTED TONIGHT EXPECTED TO LEAD TO AT LEAST A
FORCED SQUALL LINE OF DAMAGING WINDS AND EMBEDDED SUPERCELLS THAT
WILL TRACK ACROSS THE LOWER MO VALLEY INTO MID MS VALLEY OVERNIGHT.

THE TORNADO POTENTIAL THIS AREA WILL BE DEPENDENT ON AMOUNT OF
DESTABILIZATION THAT CAN OCCUR AND HOW FAR N. GFS IS INDICATING
THERE WILL BE SUFFICIENT INSTABILITY FOR BOTH VERY DAMAGING WINDS
AND TORNADIC SUPERCELLS AS THE SQUALL LINE MOVES RAPIDLY EWD DRIVEN
BY THE 100KT 500MB WIND MAX ROTATING AROUND THE DEEPENING LOW ACROSS
NRN MO. HAVE SHIFTED BOTH THE MDT/SLGT RISK AREAS SIGNIFICANTLY NWD
TO ACCOUNT FOR THE EXPECTED GREATER INSTABILITY.

ALONG WITH THE TORNADO POTENTIAL...SIGNIFICANT WIND DAMAGE WILL
ACCOMPANY THE SQUALL LINE POSSIBLY AS FAR E AS LOWER OH AND WRN TN
VALLEYS LATER TONIGHT.

GIVEN THE COMPLEXITY/INTENSITY OF THE DEVELOPING STORM SYSTEM AND
AVAILABILITY OF UNSTABLE GULF AIR...THE NEXT 24-48 HOURS EXPECTED TO
SEE A LARGE AREA AFFECTED BY SEVERE THUNDERSTORMS INCLUDING THE
POTENTIAL FOR STRONG TORNADOES AND PARTICULARLY DAMAGING WINDS.

..HALES/JEWELL.. 05/10/2008

CLICK TO GET WUUS01 PTSDY1 PRODUCT
NOTE: THE NEXT DAY 1 OUTLOOK IS SCHEDULED BY 1630Z