Late this morning convection began in East Texas and with the heating of the day that area is developing eastward. There have been a few tornado warnings issued and a cell is currently being warned for a tornado on the Texas-Louisiana border. Tornado Watch 79 has been issued for central Louisiana.
The SPC has increased the area of the moderate risk in its last two updates and has ramped the probabilities for damaging wind up to 45%.
SEL9
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 79
NWS STORM PREDICTION CENTER NORMAN OK
255 PM CDT FRI MAR 27 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
SOUTHWEST INTO CENTRAL LOUISIANA
EXTREME SOUTHWEST MISSISSIPPI
EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 255 PM UNTIL 900
PM CDT.
TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 80 STATUTE
MILES EAST AND WEST OF A LINE FROM 55 MILES EAST NORTHEAST OF
FORT POLK LOUISIANA TO 30 MILES WEST OF LAFAYETTE LOUISIANA. FOR
A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU9).
REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.
OTHER WATCH INFORMATION...CONTINUE...WW 77...WW 78...
DISCUSSION...A CLUSTER OF STORMS HAS DEVELOPED RECENTLY IN THE
EXTREME SE TX IN THE ERN PART OF WW 77. STRONG SURFACE HEATING HAS
OCCURRED ACROSS SRN LA IN ADVANCE OF THIS CONVECTION...AND S OF A
SLOW-MOVING OUTFLOW BOUNDARY LOCATED JUST N OF I-10. THOUGH
BACKGROUND LOW-LEVEL WINDS ARE NOT STRONG...THE BACKED WINDS ALONG
THE BOUNDARY ARE RESULTING IN A RELATIVE MAXIMUM IN LOW-LEVEL SHEAR.
THIS SOMEWHAT STRONGER SHEAR...COMBINED WITH STRONG SURFACE-BASED
INSTABILITY AND BOUNDARY LAYER DEWPOINTS NEAR 70 F...WILL LIKELY
SUPPORT A CLUSTER OF HP SUPERCELLS ALONG THE BOUNDARY FOR THE NEXT
FEW HOURS. A COUPLE OF TORNADOES WILL BE POSSIBLE...IN ADDITION TO
LARGE HAIL AND DAMAGING WINDS.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 27030.
...THOMPSON
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