WATCHES: Tornado Watch Number 549

WWUS20 KWNS 292030
SEL9
SPC WW 292030
NEZ000-SDZ000-300300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 549
NWS STORM PREDICTION CENTER NORMAN OK
330 PM CDT THU JUL 29 2010

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

PARTS OF NORTHCENTRAL NEBRASKA
PARTS OF SOUTHERN AND WESTERN SOUTH DAKOTA

EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 330 PM UNTIL
1000 PM CDT.

TORNADOES...HAIL TO 3.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 90 STATUTE
MILES EAST AND WEST OF A LINE FROM 35 MILES EAST NORTHEAST OF
RAPID CITY SOUTH DAKOTA TO 40 MILES EAST OF MULLEN NEBRASKA. 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 548...

DISCUSSION...AIR MASS NOW QUITE UNSTABLE ACROSS THE WATCH AREA AND
FAVORABLY SHEARED TO SUPPORT SUPERCELLS. A SUPERCELL HAS DEVELOPED
S END OF BLACK HILLS AND WILL LIKELY CONTINUE SEWD INTO A FAVORABLE
ENVIRONMENT FOR NOT ONLY LARGE HAIL BUT POSSIBLY TORNADIC
DEVELOPMENT. ADDITIONAL SEVERE STORMS ARE LIKELY SEWD INTO NCENTRAL
NEB WHERE SIMILAR CONDITIONS PREVAIL.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 30015.

...HALES

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