Hail size 1.25"
3 NE O'Fallon St. Charles County
“Report from mPING: Half Dollar (1.25 in.). (LSX)”
— NOAA / SPC storm report
/ Storm field report · St. Charles
Hail in O Fallon · Apr 27, 2026
NEXRAD logged 14 hail signatures up to 1.75"; the estimated-size surface reached 0.75" aloft. Open it on the live map to see the swath over the streets.
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Peak hail signal 1.75" ≈ golf ball · the largest NEXRAD radar signature
Homes in the hail footprint 4,609
Ground reports 6 6 hail
Radar surfaces 2 NEXRAD + estimated size
Convective day · Apr 27, 2026 · noon–noon UTC
Severity
The most severe storm O Fallon has seen in the last 12 months
Composite score · 6.0 / 10
Storm severity score
Overview's storm severity score weighs hailstone size, homes in the footprint, and ground-truth reports.
6.0 /10
- Peak hail signal
- 44 /100
- Homes exposed
- 73 /100
- Ground truth
- 100 /100
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
How O Fallon saw the hail — from two instruments
Apr 27, 2026 · O Fallon, MO
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.
NEXRAD radar signatures Surface resolved
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.
Max size
1.75"
Detections
14
Radar-estimated hail size Surface resolved
Estimated size field 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.
Max size
0.75"
The storm in context
Where Apr 27, 2026 sits in O Fallon's hail record.
This was O Fallon's 2nd recorded hail day, arriving 10 days after the Apr 17, 2026 storm. By severity it ranks 1st of the 3 storms we have logged here. Radar put the day's largest stone over O Fallon at 1.75" — the largest NEXRAD radar signature.
The Apr 27, 2026 convective day was bigger than O Fallon: the same system put hail over 1,188 other tracked cities, 305 of them in Missouri. Nearest: Moscow Mills (5 miles west, up to 2"); Winfield (7 miles north, up to 1.75"); Golden Eagle (11 miles east, up to 1").
These maps are stills. In the app this date is one of 3 O Fallon 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
What people on the ground reported
6 reports filed with the NWS
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.
Hail reports
6 reports Hail size 1"
4 NW Saint Peters St. Charles County
“(LSX)”
— NOAA / SPC storm report
Hail size 1.25"
1 NNE O'Fallon St. Charles County
“(LSX)”
— NOAA / SPC storm report
Hail size 1.25"
2 NNE O'Fallon St. Charles County
“(LSX)”
— NOAA / SPC storm report
Hail size 1"
2 WNW O'Fallon St. Charles County
“(LSX)”
— NOAA / SPC storm report
Hail size 1"
2 E O'Fallon St. Charles County
“Near Mexico Road and Salt Lick. (LSX)”
— NOAA / SPC storm report
Storm forensics
How the storm moved
Timing and place names from NOAA ground reports
Read from the arrival times and locations of the NOAA ground reports, not a radar-measured storm track.
Reports came from O'Fallon and Saint Peters — beyond O Fallon itself.
High damage potential
What 1.75" hail means for O Fallon roofs.
Hail around an inch and a half is capable of cracking shingles, stripping granules, and denting gutters, vents, and siding. Risk is usually greatest near the strongest radar signal, but property-level damage still requires an on-site inspection.
Radar reading · not confirmed damage
Roofing exposure
What this storm is worth to a roofer.
4,609 homes × $12,000 avg. claim
Potential roof exposure
$55M
Potential roof exposure — 4,609 homes × the ~$12,000 industry-average hail roof claim. Exposure, not confirmed damage.
- Illustrative jobs
- 23 jobs
- Illustrative work
- ~$345K
Close just 0.5% of the 4,609 homes in this footprint at the average $15,000 roof job. Illustrative math, not a projection — your results depend on your outreach and how the market responds.
Claim window
April 2028
Claims from this storm can typically be filed until around April 2028 — the window to reach these homeowners while it's still open. Deadlines vary by policy and state.
Names and phones for every home in the footprint: at most $968 on top of the $150 plan.
O Fallon hail history
Other storms in O Fallon.
3 recorded storm days in O Fallon, MO
The next storm won’t wait for you.
Set your territory and alerts today. When hail hits, use Overview to choose your streets and get moving.
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For iPhone. Android coming soon.
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A storm day here is a convective day — it runs from noon to noon
UTC, so late-night hail is grouped with the afternoon storm that
spawned it rather than split across two calendar dates. Ground
reports are public-domain observations from the NOAA Storm
Prediction Center. Radar tells you where to look. Only an inspection confirms damage at an address. Last updated Aug 2, 2026.