NEXRAD logged 0 hail signatures up to 0"; the estimated-size surface had no signal that day. Open it on the live map to see the swath over the streets.
A tornado was also reported to the National Weather Service during this storm. The ground reports below show where it was filed.
7-day free trial in the iPhone app. No card required to start.
For iPhone. Android coming soon.
Web trial: 7 days free. Card required. $150/month after the trial unless cancelled.
Convective day · Apr 17, 2026 · noon–noon UTC
Severity
Overview's storm severity score weighs hailstone size, homes in the footprint, and ground-truth reports.
Largest radar-indicated size — a signal of damage potential, not confirmation.
How many homes sit inside the storm's footprint.
Independent storm reports filed with the NWS.
Evidence / storm surfaces
Each storm gets two readings: the radar signatures NEXRAD recorded as the cells passed overhead, and a modeled estimate of hail size in the air. They are independent surfaces, so a mismatch between them is expected — and worth reading.
Radar signature field The point detections NEXRAD recorded overhead. Each signature marks where the radar saw hail aloft — it is a detection, not a stone measured on the ground.
Only the NEXRAD radar-signature surface resolved for Apr 17, 2026 — the estimated-size swath had no hail signal to model for this storm, so there is one map to show, not two.
The storm in context
This was La Moille's 1st recorded hail day — the first hail day in our records for the city. By severity it ranks 6th of the 6 storms we have logged here. Radar put the day's largest stone over La Moille at 0" — radar-estimated size aloft.
The Apr 17, 2026 convective day was bigger than La Moille: the same system put hail over 1,016 other tracked cities, 101 of them in Illinois. Nearest: Amboy (16 miles northwest, up to 0"); Earlville (16 miles east, up to 0"); Ohio (17 miles northwest, up to 1").
These maps are stills. In the app this date is one of 6 La Moille storm dates on a live map — both surfaces, the reports, and a replay — and the same map is where you draw the swath. This page rebuilds nightly.
Ground reports
These are storm reports filed with the National Weather Service and released through the NOAA Storm Prediction Center — public-domain observations from spotters, the public, and NWS surveys. We quote each one exactly as filed.
“An EF-1 tornado developed in far eastern Bureau County... with estimated max winds of 90 mph. A barn sustained roofing damage. The tornado then moved NE into LaSalle Co (DVN)”
— NOAA / SPC storm report
“An NWS storm survey confirmed an EF-1 tornado with peak winds near 90 mph... path length of 14.9 miles... and maximum width near 700 yards started in Bureau County and (LOT)”
— NOAA / SPC storm report
Storm forensics
Read from the arrival times and locations of the NOAA ground reports, not a radar-measured storm track.
Reports came from Arlington and Mendota — beyond La Moille itself.
Below the severe threshold
Radar signals under three-quarters of an inch stay below the National Weather Service severe threshold and generally indicate lower roof risk. Older or already-worn materials can still show effects, but radar alone cannot determine whether a specific roof was damaged.
Radar reading · not confirmed damage
La Moille hail history
Estimated-size surface 
Estimated-size surface 
Estimated-size surface 
Estimated-size surface 
Estimated-size surface Set your territory and alerts today. When hail hits, use Overview to choose your streets and get moving.
7-day free trial in the iPhone app. No card required to start.
For iPhone. Android coming soon.
Web trial: 7 days free. Card required. $150/month after the trial unless cancelled.