Storm Prediction Center Severe Thunderstorm Watch 580

Note: 
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
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   SEL0

   URGENT - IMMEDIATE BROADCAST REQUESTED
   Severe Thunderstorm Watch Number 580
   NWS Storm Prediction Center Norman OK
   130 AM CDT Thu Aug 13 2026

   The NWS Storm Prediction Center has issued a

   * Severe Thunderstorm Watch for portions of 
     Western Iowa
     Eastern Nebraska

   * Effective this Thursday morning from 130 AM until 800 AM CDT.

   * Primary threats include...
     Scattered damaging winds and isolated significant gusts to 85
       mph likely
     Isolated large hail events to 1 inch in diameter possible

   SUMMARY...A severe linear thunderstorm cluster will continue east
   into the Watch area during the overnight and move east into western
   Iowa during the early morning.  Scattered severe gusts 60 to 85 mph
   are expected with the more intense portions of the squall line.

   The severe thunderstorm watch area is approximately along and 55
   statute miles north and south of a line from 45 miles west of
   Columbus NE to 65 miles east southeast of Denison IA. For a complete
   depiction of the watch see the associated watch outline update
   (WOUS64 KWNS WOU0).

   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 579...

   AVIATION...A few severe thunderstorms with hail surface and aloft to
   1 inch. Extreme turbulence and surface wind gusts to 75 knots. A few
   cumulonimbi with maximum tops to 550. Mean storm motion vector
   27040.

   ...Smith

Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.

   SAW0 
   WW 580 SEVERE TSTM IA NE 130630Z - 131300Z
   AXIS..55 STATUTE MILES NORTH AND SOUTH OF LINE..
   45W OLU/COLUMBUS NE/ - 65ESE DNS/DENISON IA/
   ..AVIATION COORDS.. 50NM N/S /7NE OBH - 28WNW DSM/
   HAIL SURFACE AND ALOFT..1 INCH. WIND GUSTS..75 KNOTS.
   MAX TOPS TO 550. MEAN STORM MOTION VECTOR 27040.

   LAT...LON 42249822 42419422 40829422 40659822

   THIS IS AN APPROXIMATION TO THE WATCH AREA.  FOR A
   COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
   FOR WOU0.

Watch 580 Status Report Message has not been issued yet.

Note:
 Click for Complete Product Text.

Tornadoes

Wind

Hail

Combined Severe Hail/Wind

For each watch, probabilities for particular events inside the watch
(listed above in each table) are determined by the issuing forecaster.
The “Low” category contains probability values ranging from less than 2%
to 20% (EF2-EF5 tornadoes), less than 5% to 20% (all other probabilities),
“Moderate” from 30% to 60%, and “High” from 70% to greater than 95%.
High values are bolded and lighter in color to provide awareness of
an increased threat for a particular event.