ZCZC SPCSWOMCD ALL
ACUS11 KWNS 300517 
SPC MCD 300517 
TNZ000-GAZ000-ALZ000-300715-

MESOSCALE DISCUSSION 1850
NWS STORM PREDICTION CENTER NORMAN OK
1117 PM CST TUE NOV 29 2016

AREAS AFFECTED...PORTIONS OF SOUTHERN TN...NORTHERN AL...NORTHWEST GA

CONCERNING...TORNADO WATCH 507...509...510

VALID 300517Z - 300715Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 507...509...510 CONTINUES.

SUMMARY...THE SEVERE-THUNDERSTORM/TORNADO RISK CONTINUES ACROSS
TORNADO WATCHES 507...509...AND 510.

DISCUSSION...ONGOING SUPERCELL THUNDERSTORMS/CLUSTERS CONTINUE
TRACKING NORTHEASTWARD WITHIN A ZONE OF MODEST WARM ADVECTION ACROSS
PORTIONS OF THE TENNESSEE VALLEY REGION AND VICINITY. ADDITIONAL
CONVECTION IN MS WILL ALSO ADVANCE INTO PORTIONS OF THE AREA DURING
THE NEXT SEVERAL HOURS. LOW-LEVEL SOUTHERLIES WILL CONTINUE TO
ENCOURAGE MOIST/UNSTABLE INFLOW FOR THE CONVECTION. MIDDLE 60S
SURFACE DEWPOINTS...CHARACTERIZING THE MOIST BOUNDARY LAYER FEEDING
THIS CONVECTION...ARE SUPPORTING AROUND 250-750 J/KG OF MLCAPE --
STRONGEST FROM NORTH-CENTRAL INTO NORTHEAST AL AND FAR NORTHWEST GA.
SUBSTANTIALLY ELONGATED HODOGRAPHS FEATURING LOW-LEVEL CURVATURE
WILL CONTINUE SUPPORTING TORNADIC-SUPERCELL POTENTIAL THROUGH THE
OVERNIGHT HOURS. DAMAGING STRAIGHT-LINE WINDS WILL ALSO BE POSSIBLE...
AS HIGH-MOMENTUM AIR ABOVE THE GROUND MAY BE TRANSFERRED TO THE
SURFACE IN STRONGER DOWNDRAFTS.

REMAINING-VALID PORTIONS OF WATCH 507 IN PORTIONS OF SOUTHERN TN
SHOULD BE ALLOWED TO EXPIRE BY 06Z...AS THE MORE SUBSTANTIAL SEVERE
RISK WILL EXIST FARTHER SOUTH/EAST.

..COHEN.. 11/30/2016

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...MRX...FFC...OHX...BMX...HUN...

LAT...LON   34338582 34378750 34618782 35158679 35588510 35208472
            34748492 34338582 

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