Storm Prediction Center Severe Thunderstorm Watch 142

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The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
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   SEL2

   URGENT - IMMEDIATE BROADCAST REQUESTED
   Severe Thunderstorm Watch Number 142
   NWS Storm Prediction Center Norman OK
   555 AM CDT Fri Apr 18 2025

   The NWS Storm Prediction Center has issued a

   * Severe Thunderstorm Watch for portions of 
     Southern Wisconsin
     Lake Michigan

   * Effective this Friday morning from 555 AM until 1100 AM CDT.

   * Primary threats include...
     Scattered large hail and isolated very large hail events to 2
       inches in diameter possible
     Scattered damaging wind gusts to 70 mph possible

   SUMMARY...Multiple supercells and bowing structures will spread
   quickly eastward this morning across southern Wisconsin. Scattered
   large hail around 1-2 inches in diameter and 60-70 mph wind gusts
   may occur with this activity.

   The severe thunderstorm watch area is approximately along and 30
   statute miles north and south of a line from 40 miles west of
   Madison WI to 30 miles east northeast of Racine WI. 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.

   &&

   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
   27050.

   ...Gleason

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

   SAW2 
   WW 142 SEVERE TSTM WI LM 181055Z - 181600Z
   AXIS..30 STATUTE MILES NORTH AND SOUTH OF LINE..
   40W MSN/MADISON WI/ - 30ENE RAC/RACINE WI/
   ..AVIATION COORDS.. 25NM N/S /30SSW DLL - 46ESE BAE/
   HAIL SURFACE AND ALOFT..2 INCHES. WIND GUSTS..60 KNOTS.
   MAX TOPS TO 500. MEAN STORM MOTION VECTOR 27050.

   LAT...LON 43569012 43368726 42498726 42699012

   THIS IS AN APPROXIMATION TO THE WATCH AREA.  FOR A
   COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
   FOR WOU2.

Watch 142 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.