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.
SEL4
URGENT – IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 434
NWS Storm Prediction Center Norman OK
1200 PM CDT Wed Jun 18 2025
The NWS Storm Prediction Center has issued a
* Tornado Watch for portions of
Northeast Illinois
Northern and Central Indiana
Southwest Lower Michigan
Lake Michigan
* Effective this Wednesday afternoon and evening from NOON until
700 PM CDT.
* Primary threats include…
A few tornadoes likely with a couple intense tornadoes possible
Scattered damaging winds likely with isolated significant gusts
to 75 mph possible
Scattered large hail events to 1.5 inches in diameter possible
SUMMARY…Intense thunderstorms currently developing over central
Illinois will spread northeastward through the afternoon. High
instability and favorable wind fields will promote a risk of
damaging winds and tornadoes.
The tornado watch area is approximately along and 85 statute miles
east and west of a line from 25 miles north northwest of South Bend
IN to 35 miles south of Bloomington IN. For a complete depiction of
the watch see the associated watch outline update (WOUS64 KWNS
WOU4).
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 432…WW 433…
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 500. Mean
storm motion vector 24035.
…Hart
Note: The Aviation Watch (SAW) product is an approximation to the watch area. The actual watch is depicted by the shaded areas.
SAW4
WW 434 TORNADO IL IN MI LM 181700Z – 190000Z
AXIS..85 STATUTE MILES EAST AND WEST OF LINE..
25NNW SBN/SOUTH BEND IN/ – 35S BMG/BLOOMINGTON IN/
..AVIATION COORDS.. 75NM E/W /18NNW GIJ – 59SSE TTH/
HAIL SURFACE AND ALOFT..1.5 INCHES. WIND GUSTS..65 KNOTS.
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 24035.
LAT…LON 42028485 38638505 38638819 42028816
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU4.
Watch 434 Status Report Message has not been issued yet.
Note: Click for Complete Product Text.Tornadoes
Probability of 2 or more tornadoes
High (70%)
Probability of 1 or more strong (EF2-EF5) tornadoes
Mod (30%)
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 (40%)
Probability of 1 or more hailstones > 2 inches
Low (20%)
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.