WATCHES: Tornado Watch Number 198

WWUS20 KWNS 291733
SEL8
SPC WW 291733
TXZ000-300100-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 198
NWS STORM PREDICTION CENTER NORMAN OK
1235 PM CDT SUN APR 29 2007

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

SOUTHWEST TEXAS

EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 1235 PM UNTIL
800 PM CDT.

TORNADOES...HAIL TO 1.5 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 60 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 55 MILES NORTH NORTHWEST OF
MARFA TEXAS TO 40 MILES NORTH NORTHEAST OF DEL RIO TEXAS. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU8).

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.

DISCUSSION...MID LEVEL LOW OVER NRN MEXICO WILL EJECT SLOWLY ENEWD
TOWARD THE BIG BEND THROUGH THE AFTERNOON. INCREASING MID LEVEL
SWLY FLOW WILL OVERSPREAD THE BIG BEND AND LOWER PECOS VALLEY ABOVE
LOW-LEVEL ESELY FLOW...WHILE THE MID LEVEL DRY SLOT WILL ALLOW
POCKETS OF STRONGER SURFACE HEATING/DESTABILIZATION. EXPECT
ADDITIONAL STORMS TO FORM THIS AFTERNOON OVER THE HIGHER TERRAIN AND
SPREAD NWD/NEWD...WITH THE POTENTIAL FOR SUPERCELLS WITH LARGE HAIL
AND ISOLATED DAMAGING WINDS. ADDITIONALLY...SUBSTANTIAL MOISTURE
AND BUOYANCY IN THE LOW LEVELS...ALONG WITH THE SUPERCELL WIND
PROFILE...COULD SUPPORT A COUPLE OF TORNADOES.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 22020.

..THOMPSON

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
To unsubscribe from WX-STORM send e-mail to LISTSERV@PO.UIUC.EDU with
"unsub wx-storm" in the body of your message. For more information write chris@lib.siu.edu.