

375 

WWUS20 KWNS 082313

SEL5

SPC WW 082313

NDZ000-NEZ000-SDZ000-090600-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 265

NWS STORM PREDICTION CENTER NORMAN OK

615 PM CDT SUN MAY 8 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTH CENTRAL NORTH DAKOTA

       NORTHERN NEBRASKA

       CENTRAL SOUTH DAKOTA



EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 615 PM UNTIL

100 AM CDT.



TORNADOES...HAIL TO 3 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 55 STATUTE

MILES EAST AND WEST OF A LINE FROM 30 MILES WEST NORTHWEST OF

BISMARCK NORTH DAKOTA TO 20 MILES EAST SOUTHEAST OF BURWELL

NEBRASKA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).



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...ISOLATED TO SCATTERED THUNDERSTORMS ARE EXPECTED TO

FORM THIS EVENING ALONG THE INSTABILITY AXIS EXTENDING FROM NORTHERN

NEB INTO SOUTH CENTRAL ND.  WEAKENING INHIBITION AND WEAK LOW LEVEL

WARM ADVECTION WILL HELP INITIATION.  THOSE STORMS THAT FORM WILL BE

IN ENVIRONMENT OF FAVORABLE LOW LEVEL AND DEEP LAYER VERTICAL SHEAR

TO BECOME SLOW-MOVING SUPERCELLS CAPABLE OF VERY LARGE HAIL AND

DAMAGING WINDS.  ISOLATED TORNADOES WILL ALSO BE POSSIBLE.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 27015.





...HART

