Hail in Alton Jul 11, 2026
Hit 23 days agoThe radar-estimated size surface caught this storm, reaching 0.5" aloft. NEXRAD logged no point detections over Alton this day.
0.5"
≈ pea to penny · radar-estimated size aloft0
0
none filedThe 5th most severe storm Alton has seen in the last 12 months
Overview's storm severity score weighs hailstone size, homes in the footprint, and ground-truth reports.
- Hail size
- 13 /100
- Homes exposed
- 0 /100
- Ground truth
- 0 /100
Largest hailstone — the top predictor of roof damage.
How many homes sit inside the storm's footprint.
Independent storm reports filed with the NWS.
How Alton saw the hail — from two instruments
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-estimated hail size over the swath. The model reports the biggest stone the storm could sustain in the air; what actually fell may have been smaller.
Only the radar-estimated size surface resolved for Jul 11, 2026 — this storm produced no NEXRAD point detections over Alton, so there is one map to show, not two.
Where Jul 11, 2026 sits in Alton's hail record
This was Alton's 3rd recorded hail day, arriving 5 days after the Jul 6, 2026 storm. By severity it ranks 5th of the 5 storms we have logged here. Radar put the day's largest stone over Alton at 0.5" — radar-estimated size aloft.
The Jul 11, 2026 convective day was bigger than Alton: the same system put hail over 483 other tracked cities, 6 of them in Missouri. Nearest: Winona (28 miles north, up to 0.5"); Grandin (34 miles east, up to 0.75"); Black Rock (42 miles south, up to 2").
These maps are stills from Alton's Jul 11, 2026 storm. In the Overview app the same surfaces are live — radar updating in real time, radar-estimated hail size as it forms, and NWS spotter reports pinned where they're filed — with a radar replay you can scrub back over any past day.
What people on the ground reported
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.
Nobody on the ground filed a report over Alton for this date, which says more about who was watching than about the storm: spotter reports only exist where there is an observer. The radar surfaces above carry the evidence for this one.
What 0.5" hail means for Alton roofs
Hail under three-quarters of an inch stays below the National Weather Service severe threshold and rarely breaks shingles outright. But repeated small-hail events accelerate granule loss and shorten roof life — on older roofs, it's still worth a conversation.
Track hail over Alton on the live map
Radar updates in real time, spotter reports appear on the map as they're filed, and the full Alton storm history — this Jul 11, 2026 storm included — sits underneath. When you're ready, draw this storm's footprint and pull highly accurate homeowner contact information for every address inside it.
Highly accurate contact information starting at $0.23 per address — every contact included. Digital leads cost $15–$40. Start with a 7-day free trial — no credit card required. See pricing
5 recorded storm days in Alton, MO
Other storms in Alton
Jul 31, 2026
1"
Jul 21, 2026
1"
Jul 6, 2026
1"
Jun 13, 2026
0.75"