MESO: Mesoscale Discussion 0641

ACUS11 KWNS 112235
SWOMCD
SPC MCD 112234
TNZ000-VAZ000-NCZ000-KYZ000-GAZ000-ALZ000-112330-

MESOSCALE DISCUSSION 0641
NWS STORM PREDICTION CENTER NORMAN OK
0534 PM CDT FRI APR 11 2008

AREAS AFFECTED...ERN TN / NERN AND CNTRL AL / NWRN GA

CONCERNING...TORNADO WATCH 198...

VALID 112234Z - 112330Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 198 CONTINUES.

THE POTENTIAL FOR SUPERCELLS CAPABLE OF DAMAGING WINDS...HAIL AND
PERHAPS A COUPLE OF TORNADOES CONTINUES ACROSS WW AREA...NAMELY
ALONG AND E OF A LINE FROM BHM TO RMG. THIS THREAT MAY EVENTUALLY
SPREAD E OF WW INTO E-CNTRL AL AND NWRN GA...REQUIRING A LOCAL
EXTENSION IN WATCH AREA.

AS OF 2220Z...REGIONAL RADAR IMAGERY INDICATED A MULTI-MODE
CONVECTIVE BAND FROM ERN TN SWWD INTO CNTRL AL...WITH MORE DISCRETE
STORMS EXHIBITING SOME SUPERCELL CHARACTERISTICS OVER POLK CO TN AND
FLOYD CO GA. FARTHER TO THE SW...SEVERAL COMPLEX STORM-SCALE
INTERACTIONS HAVE RESULTED IN A WAVY CONVECTIVE LINE OF STORMS WITH
EMBEDDED ROTATING UPDRAFTS...ORIENTED FROM NE-SW FROM HALE CO TO ST
CLAIR CO IN AL. WHILE MODEL GUIDANCE SUGGESTS THAT SWLY LLJ IS
GRADUALLY WEAKENING ACROSS THE REGION...DEWPOINTS IN THE MID 50S TO
LOWER 60S COUPLED WITH THE PRESENCE OF A LOW-LEVEL THERMAL AXIS
SHOULD SUPPORT THE EWD PROGRESSION OF ONGOING STORMS INTO PORTIONS
OF E-CNTRL AL AND NWRN GA THROUGH 00Z.

ISOLATED TORNADOES WILL REMAIN POSSIBLE WITH THE MORE DISCRETE
SUPERCELLS...NAMELY E AND NE OF BHM WHERE THE BOUNDARY LAYER IS MORE
MOIST AND LOW-LEVEL SHEAR IS STRONGER. OTHERWISE...THE MORE INTENSE
STORMS WILL REMAIN CAPABLE OF LOCALLY DAMAGING WINDS AND HAIL.

.MEAD.. 04/11/2008

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

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

33128795 34068769 34448697 35158621 36698476 36668332
36308306 34608445 34118439 33368474 33158512 33018565
32928713 32948786

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