

747 

WWUS20 KWNS 052149

SEL1

SPC WW 052149

NEZ000-SDZ000-060500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 391

NWS STORM PREDICTION CENTER NORMAN OK

450 PM CDT SUN JUL 5 2015



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  NORTHWEST AND NORTH CENTRAL NEBRASKA

  SOUTH CENTRAL SOUTH DAKOTA



* EFFECTIVE THIS SUNDAY AFTERNOON FROM 450 PM UNTIL MIDNIGHT CDT.



* PRIMARY THREATS INCLUDE...

  SCATTERED LARGE HAIL AND ISOLATED VERY LARGE HAIL EVENTS TO 2.5

    INCHES IN DIAMETER POSSIBLE

  SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  A TORNADO OR TWO POSSIBLE



SUMMARY...ISOLATED SUPERCELLS WILL CONTINUE TO DEVELOP ACROSS SRN SD

AND WRN NEB THE NEXT FEW HOURS...WITH THE RISK FOR ISOLATED VERY

LARGE HAIL...AND PERHAPS A TORNADO WITH STORMS INTERACTING WITH A

SURFACE FRONT IN THE AREA.  LATER THIS EVENING...STORM MERGERS AND

UPSCALE GROWTH SHOULD SUPPORT THE FORMATION OF ONE OR MORE CLUSTERS

THAT WILL SPREAD EWD...WITH AN ATTENDANT RISK FOR DAMAGING WINDS AND

HAIL.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 70

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 20 MILES WEST OF

ALLIANCE NEBRASKA TO 45 MILES SOUTH OF HURON SOUTH DAKOTA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU1).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE

FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY

DO PRODUCE TORNADOES.



&&



OTHER WATCH INFORMATION...CONTINUE...WW 390...



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 600. MEAN STORM

MOTION VECTOR 27020.





...THOMPSON

