SWOMCD
SPC MCD 130247
LAZ000-TXZ000-130415-
MESOSCALE DISCUSSION 1960
NWS STORM PREDICTION CENTER NORMAN OK
0947 PM CDT WED SEP 12 2007
AREAS AFFECTED...UPPER TX COAST/FAR SE TX AND FAR SW LA
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 130247Z - 130415Z
THREAT FOR WATERSPOUTS APPEARS TO BE INCREASING...WITH SOME TORNADO
THREAT POSSIBLE ALONG THE COASTAL AREAS OF THE UPPER TX COAST TO SW
LA THROUGH THE LATE EVENING INTO THE OVERNIGHT PERIOD.
AT 0230Z...REGIONAL RADARS INDICATED THE OUTERMOST CONVECTIVE BAND
ATTENDANT TO T.S. HUMBERTO EXTENDED FROM SWRN LA...IN CAMERON PARISH
TO 115 SE GLS. LCH RADAR ALSO INDICATED SEVERAL PERSISTENT LOW
LEVEL ROTATION COUPLETS WITHIN THIS BAND TRACKING TOWARD THE NNW.
HIGH THETA-E AIR MASS LOCATED ALONG AND OFFSHORE COMBINED WITH 0-3
KM SRH VALUES AROUND 135 M2/S2 SUGGEST POTENTIAL FOR A TORNADO
THREAT TO INCREASE ALONG THE IMMEDIATE COAST AS ROTATIONAL COUPLETS
TRACK TOWARD THE COAST.
LOW LEVEL NELY FLOW LOCATED AWAY FROM THE COAST IS ADVECTING LOW
THETA-E AIR MASS SWWD. THIS IS EXPECTED TO LIMIT THE TORNADO THREAT
FROM DEVELOPING FARTHER INLAND FROM THE COAST. GIVEN THIS
SCENARIO...GREATEST TORNADO THREAT SHOULD EXTEND FROM THE SW LA
PARISHES OF CAMERON AND VERMILION...AND WWD INTO THE UPPER TX
COASTAL AREAS TO THE NE OF GLS.
.PETERS.. 09/13/2007
..PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LCH...HGX...
29309473 29789469 30039427 30139326 30029260 29519233
29209248 29259363 29079447
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