

675 

WWUS20 KWNS 031048

SEL2

SPC WW 031048

NEZ000-SDZ000-031600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 462

NWS STORM PREDICTION CENTER NORMAN OK

445 AM MDT SAT AUG 3 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  NORTHWEST NEBRASKA

  SOUTHWEST SOUTH DAKOTA



* EFFECTIVE THIS SATURDAY MORNING FROM 445 AM UNTIL 1000 AM MDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE

  A FEW DAMAGING WIND GUSTS TO 70 MPH POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 85

STATUTE MILES EAST AND WEST OF A LINE FROM 85 MILES NORTH OF

CHADRON NEBRASKA TO 55 MILES SOUTH SOUTHWEST OF VALENTINE

NEBRASKA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



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 461...



DISCUSSION...A SMALL AREA OF SUSTAINED STORMS...INCLUDING A COUPLE

SUPERCELLS...MAY PERSIST THROUGH LATER THIS MORNING IN WAA ZONE

ASSOCIATED WITH ENTRANCE REGION OF HIGH-LVL JET STREAK NOW TRACKING

ESE ACROSS ND/MN. COOL MID-LVL TEMPS AND PRESENCE OF AMPLE /40+ KT/

WNWLY CLOUD-LAYER SHEAR FOR MID-LVL STORM ROTATION SUGGEST CHANCE

FOR A FEW INSTANCES OF LARGE HAIL AND POSSIBLY LOCALLY DMGG WIND.



AVIATION...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 29030.





...CORFIDI

