MESO: Mesoscale Discussion 1410

ACUS11 KWNS 072217
SWOMCD
SPC MCD 072217
GAZ000-ALZ000-072345-

MESOSCALE DISCUSSION 1410
NWS STORM PREDICTION CENTER NORMAN OK
0517 PM CDT SAT JUL 07 2007

AREAS AFFECTED...ERN AL

CONCERNING...TORNADO WATCH 490...

VALID 072217Z - 072345Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 490 CONTINUES.

A CLUSTER OF ROTATING STORMS ACROSS THE WRN AND SRN PART OF WW 490
SHOULD CONTINUE TO HAVE A TORNADO THREAT OVER THE NEXT FEW HOURS.
THE THREAT SHOULD EXPAND EWD AFFECTING AREAS NEAR THE GEORGIA
STATE-LINE BY EARLY EVENING.

LATEST SFC ANALYSIS SHOWS A SFC LOW EAST OF JACKSON MS WITH A
STATIONARY BOUNDARY EXTENDING EWD ACROSS SCNTRL AL JUST SOUTH OF THE
MONTGOMERY AL VICINITY. A CLUSTER OF STORMS IS ONGOING ALONG THE
BOUNDARY ALONG THE NRN GRADIENT OF A POCKET OF MODERATE INSTABILITY
IN SRN AL WHERE MLCAPE VALUES RANGE FROM 1000 TO 1500 J/KG. THE
BIRMINGHAM WSR-88D VWP CURRENTLY SHOWS A LARGE CIRCULAR HODOGRAPH
WITH STRONG DIRECTIONAL SHEAR BELOW 1 KM AND ABOUT 35 KT OF VERTICAL
SHEAR. THIS SHOULD BE SUFFICIENT FOR A FEW SUPERCELLS AND/OR BOW
ECHOES WITH TORNADO POTENTIAL OVER THE NEXT FEW HOURS. THE THREAT
SHOULD GRADUALLY SHIFT DOWNSTREAM TO AREAS EAST OF HIGHWAY 231 IN
THE 23Z TO 01Z TIMEFRAME.

.BROYLES.. 07/07/2007

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

ATTN...WFO...FFC...TAE...BMX...MOB...

31388601 31428559 31548506 31998483 32558485 32908503
32958532 32978617 32918687 32628705 32018708 31628686
31448638

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