SWOMCD
SPC MCD 122224
LAZ000-TXZ000-130000-
MESOSCALE DISCUSSION 1959
NWS STORM PREDICTION CENTER NORMAN OK
0524 PM CDT WED SEP 12 2007
AREAS AFFECTED...UPPER TX COAST
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 122224Z - 130000Z
CONVECTIVE TRENDS FOR INCREASING LOW LEVEL STORM ROTATIONS ATTENDANT
TO APPROACHING T.S. HUMBERTO WILL BE MONITORED...AND TORNADO WATCH
MAY BE NEEDED THIS EVENING.
ISOLATED TORNADO THREAT MAY INCREASE BY 23Z AS NRN MOST TROPICAL
RAIN BAND ATTENDANT WITH T.S. HUMBERTO REACHES THE TX COAST. THIS
THREAT IS EXPECTED TO PERSIST THROUGH THE EVENING AS THE CENTER OF
HUMBERTO APPROACHES THE UPPER TX COAST.
REGIONAL RADARS INDICATED THE CENTER OF T.S. HUMBERTO APPROXIMATELY
45 S GLS...WITH THE OUTERMOST ATTENDANT RAINBAND ON THE NRN
PERIPHERY OF THIS SYSTEM EXTENDING FROM ALONG THE TX COAST...15 WSW
GLS TO OFFSHORE AT 35 ESE GLS. THE OFFSHORE PORTIONS OF THIS BAND
ARE EXPECTED TO REACH THE UPPER TX COAST BY 23Z. THUS FAR...THERE
HAVE BEEN JUST A FEW LOW LEVEL ROTATIONS ASSOCIATED WITH DISCRETE
OFFSHORE CELLS. HOWEVER...LOW LEVEL SHEAR VALUES HAVE ALREADY
BECOME FAVORABLE LATE THIS AFTERNOON ACROSS THE UPPER TX COAST PER
HGX WSR-88D VAD...WITH 0-1 KM SHEAR VALUES ABOVE 20 KT AND 0-3 KM
SRH VALUES AOA 150 M2/S2.
.PETERS.. 09/12/2007
..PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LCH...HGX...
29009516 29389517 29729508 29929485 30039449 30079410
29959384 29579371 29319381 28679504
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