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Severe Thunderstorm Watch 421
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WW0421 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Moderate Moderate
Severe Hail 2"+ Hail
Moderate Low

Note:  The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.
Note: Click for Watch Status Reports.
   SEL1

   URGENT - IMMEDIATE BROADCAST REQUESTED
   Severe Thunderstorm Watch Number 421
   NWS Storm Prediction Center Norman OK
   725 PM CDT Sat Jun 15 2024

   The NWS Storm Prediction Center has issued a

   * Severe Thunderstorm Watch for portions of 
     Western and Central Iowa
     Far Northeastern Kansas
     Northwest Missouri

   * Effective this Saturday night and Sunday morning from 725 PM
     until 200 AM CDT.

   * Primary threats include...
     Scattered damaging winds and isolated significant gusts to 75
       mph possible
     Isolated large hail events to 1.5 inches in diameter possible
     A tornado or two possible

   SUMMARY...A squall line will move northeastward into the Watch area
   this evening.  Severe gusts (60-75 mph) are possible with the more
   intense portions of the squall line as it likely progresses west to
   east across much of the Watch area.  A tornado is possible,
   especially with any longer-lived mesovortex circulation embedded
   within the line.  A large hail risk may accompany more cellular
   storms later this evening into the early overnight.

   The severe thunderstorm watch area is approximately along and 55
   statute miles east and west of a line from 15 miles north northeast
   of Fort Dodge IA to 40 miles west of Chillicothe MO. 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 417...WW 418...WW
   419...WW 420...

   AVIATION...A few severe thunderstorms with hail surface and aloft to
   1.5 inches. Extreme turbulence and surface wind gusts to 65 knots. A
   few cumulonimbi with maximum tops to 500. Mean storm motion vector
   23035.

   ...Smith
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