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.
SEL8
URGENT – IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 508
NWS Storm Prediction Center Norman OK
450 PM CDT Fri Jul 11 2025
The NWS Storm Prediction Center has issued a
* Tornado Watch for portions of
Northern Illinois
Southern Wisconsin
* Effective this Friday afternoon and evening from 450 PM until
1100 PM CDT.
* Primary threats include…
A few tornadoes possible
Scattered damaging winds likely with isolated significant gusts
to 75 mph possible
Isolated large hail events to 1.5 inches in diameter possible
SUMMARY…A small but intense bow will move quickly eastward this
evening while posing a threat for a few tornadoes and scattered to
numerous severe/damaging winds. Peak gusts may reach up to 65-75
mph. Isolated large hail may also occur.
The tornado watch area is approximately along and 55 statute miles
east and west of a line from 10 miles east northeast of Madison WI
to 55 miles south southeast of Rockford IL. For a complete depiction
of the watch see the associated watch outline update (WOUS64 KWNS
WOU8).
PRECAUTIONARY/PREPAREDNESS ACTIONS…
REMEMBER…A Tornado Watch means conditions are favorable for
tornadoes and 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.
&&
OTHER WATCH INFORMATION…CONTINUE…WW 505…WW 506…WW 507…
AVIATION…Tornadoes and 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 550. Mean
storm motion vector 27045.
…Gleason
Note: The Aviation Watch (SAW) product is an approximation to the watch area. The actual watch is depicted by the shaded areas.
SAW8
WW 508 TORNADO IL WI 112150Z – 120400Z
AXIS..55 STATUTE MILES EAST AND WEST OF LINE..
10ENE MSN/MADISON WI/ – 55SSE RFD/ROCKFORD IL/
..AVIATION COORDS.. 50NM E/W /35SE DLL – 18WSW JOT/
HAIL SURFACE AND ALOFT..1.5 INCHES. WIND GUSTS..65 KNOTS.
MAX TOPS TO 550. MEAN STORM MOTION VECTOR 27045.
LAT…LON 43188806 41468763 41468976 43189024
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU8.
Watch 508 Status Report Message has not been issued yet.
Note: Click for Complete Product Text.Tornadoes
Probability of 2 or more tornadoes
Mod (50%)
Probability of 1 or more strong (EF2-EF5) tornadoes
Low (20%)
Wind
Probability of 10 or more severe wind events
High (70%)
Probability of 1 or more wind events > 65 knots
Mod (30%)
Hail
Probability of 10 or more severe hail events
Mod (30%)
Probability of 1 or more hailstones > 2 inches
Low (10%)
Combined Severe Hail/Wind
Probability of 6 or more combined severe hail/wind events
High (90%)
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.