Source: US National Oceanic and Atmospheric Administration
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 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
Probability of 2 or more tornadoes
Low ( 2 inches
Mod (30%)
Combined Severe Hail/Wind
Probability of 6 or more combined severe hail/wind events
High (70%)
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.