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Particularly Dangerous Situation (PDS) Severe Thunderstorm Watch 426
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WW0426 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Moderate Low
Severe Wind 65 kt+ Wind
High High
Severe Hail 2"+ Hail
Low 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.
   SEL6

   URGENT - IMMEDIATE BROADCAST REQUESTED
   Severe Thunderstorm Watch Number 426
   NWS Storm Prediction Center Norman OK
   1125 AM CDT Mon Aug 10 2020

   The NWS Storm Prediction Center has issued a

   * Severe Thunderstorm Watch for portions of 
     Eastern Iowa
     Northern Illinois
     Far northwest Indiana
     Far southern Wisconsin
     Lake Michigan

   * Effective this Monday morning and evening from 1125 AM until
     700 PM CDT.

   ...THIS IS A PARTICULARLY DANGEROUS SITUATION...

   * Primary threats include...
     Widespread damaging winds and scattered significant gusts to 100
       mph likely
     Isolated large hail events to 1.5 inches in diameter possible
     A couple tornadoes possible

   SUMMARY...A derecho will rapidly progress across eastern Iowa and
   northern Illinois this afternoon. Widespread severe wind gusts, some
   of which should reach 80-100 mph are anticipated along the track of
   the bow. Brief tornadoes are also possible.

   The severe thunderstorm watch area is approximately along and 85
   statute miles north and south of a line from 20 miles west southwest
   of Cedar Rapids IA to 75 miles south southeast of Racine WI. For a
   complete depiction of the watch see the associated watch outline
   update (WOUS64 KWNS WOU6).

   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 425...

   AVIATION...A few severe thunderstorms with hail surface and aloft to
   1.5 inches. Extreme turbulence and surface wind gusts to 85 knots. A
   few cumulonimbi with maximum tops to 600. Mean storm motion vector
   27055.

   ...Grams
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Page last modified: August 11, 2020
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