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Severe Thunderstorm Watch 462
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WW0462 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Moderate Low
Severe Hail 2"+ Hail
Moderate Moderate

Note:  The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.
Note: Click for Watch Status Reports.
   SEL2

   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 462
   NWS STORM PREDICTION CENTER NORMAN OK
   125 PM MDT SUN AUG 17 2014

   THE NWS STORM PREDICTION CENTER HAS ISSUED A

   * SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
     NORTHERN AND CENTRAL NEBRASKA
     WESTERN AND SOUTH CENTRAL SOUTH DAKOTA

   * EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 125 PM UNTIL
     900 PM MDT.

   * PRIMARY THREATS INCLUDE...
     SCATTERED LARGE HAIL LIKELY WITH ISOLATED VERY LARGE HAIL EVENTS
       TO 2 INCHES IN DIAMETER POSSIBLE
     SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

   THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 70
   STATUTE MILES EAST AND WEST OF A LINE FROM 25 MILES EAST
   NORTHEAST OF BUFFALO SOUTH DAKOTA TO 35 MILES SOUTH OF BROKEN BOW
   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.

   &&

   DISCUSSION...STORMS ARE INCREASING FROM EXTREME SRN SD INTO FAR NRN
   NEB AS AN OUTFLOW BOUNDARY INTERSECTS A LOW-LEVEL MOISTURE
   FEED...WHILE ADDITIONAL STORMS ARE DEVELOPING OVER THE BLACK HILLS
   AND INTO FAR NWRN SD.  THE AIR MASS IS DESTABILIZING OVER WRN SD IN
   THE WAKE OF EARLIER STORMS...WITH STRONG INSTABILITY NOTED SWD INTO
   NEB WHERE MLCAPE REACHES 2500-3000 J/KG.  SUFFICIENT VERTICAL SHEAR
   /30-40 KT IN THE LOWEST 6 KM AGL/ OVER THE AREA IN ADVANCE OF A
   SUBTLE SHORT WAVE TROUGH ADVANCING EWD ACROSS MT AND WY WILL ENHANCE
   SEVERE POTENTIAL.  STRONGER STORMS INCLUDING A FEW SUPERCELLS WILL
   BE CAPABLE OF PRODUCING LARGE HAIL AND DAMAGING WIND GUSTS...WITH
   THE THREAT SPREADING SEWD THROUGH THE EVENING HOURS.

   AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
   TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
   KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
   MOTION VECTOR 28020.


   ...WEISS
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Page last modified: August 18, 2014
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