Hail size 1"
2 S Harvester St. Charles County
“Corrects previous hail report from 2 S Harvester. Report from mPING: Quarter (1.00 in.). (LSX)”
— NOAA / SPC storm report
/ Storm field report · St. Charles
Hail in Saint Charles · Apr 27, 2026
NEXRAD logged 28 hail signatures up to 2.5"; the estimated-size surface reached 1.5" aloft. At 2.5" — baseball — this is a severe hail signal associated with roof damage. Open it on the live map to see the swath over the streets.
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Peak hail signal 2.5" ≈ baseball · the largest NEXRAD radar signature
Homes in the hail footprint 16,446
Ground reports 14 13 hail · 1 wind
Radar surfaces 2 NEXRAD + estimated size
Convective day · Apr 27, 2026 · noon–noon UTC
Severity
The most severe storm Saint Charles has seen in the last 12 months
Composite score · 7.4 / 10
Storm severity score
Overview's storm severity score weighs hailstone size, homes in the footprint, and ground-truth reports.
7.4 /10
- Peak hail signal
- 63 /100
- Homes exposed
- 84 /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 Saint Charles saw the hail — from two instruments
Apr 27, 2026 · Saint Charles, MO
Two instruments, one storm: NEXRAD logs the point signatures it detected overhead, while the estimated-size surface models how large the hail aloft could have grown. Agreement between them is not guaranteed — the gaps are where the model ran ahead of, or behind, the detections.
NEXRAD radar signatures Surface resolved
Radar signature field NEXRAD's hail signatures for this storm: the spots the radar detected from above. A detection overhead is not the same thing as a confirmed stone below.
Max size
2.5"
Detections
28
Radar-estimated hail size Surface resolved
Estimated size field Radar-estimated maximum hail size across the swath, modeled from radar aloft. It reflects the biggest stone the storm could support, which may differ from what actually fell.
Max size
1.5"
The storm in context
Where Apr 27, 2026 sits in Saint Charles's hail record.
This was Saint Charles's 3rd recorded hail day, arriving 10 days after the Apr 17, 2026 storm. By severity it ranks 1st of the 11 storms we have logged here. Radar put the day's largest stone over Saint Charles at 2.5" — the largest NEXRAD radar signature.
The Apr 27, 2026 convective day was bigger than Saint Charles: the same system put hail over 1,188 other tracked cities, 305 of them in Missouri. Nearest: Saint Louis (5 miles east, up to 2"); Saint Peters (7 miles north, up to 1.25"); Ballwin (9 miles southeast, up to 1.75").
These maps are stills. In the app this date is one of 11 Saint Charles 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
14 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
13 reports Hail size 1"
2 S Harvester St. Charles County
“Report from mPING: Quarter (1.00 in.). (LSX)”
— NOAA / SPC storm report
Hail size 1.5"
1 SW Bridgeton St. Louis County
“Report from mPING: Ping Pong Ball (1.50 in.). (LSX)”
— NOAA / SPC storm report
Hail size 1"
1 N Chesterfield St. Louis County
“(LSX)”
— NOAA / SPC storm report
Hail size 1"
2 WNW Town And Country St. Louis County
“(LSX)”
— NOAA / SPC storm report
Hail size 1.25"
1 E Clarkson Valley St. Louis County
“(LSX)”
— NOAA / SPC storm report
Hail size 1"
1 S Saint John St. Louis County
“At Midland and I-170. (LSX)”
— NOAA / SPC storm report
Hail size 1.25"
3 NE O'Fallon St. Charles County
“Report from mPING: Half Dollar (1.25 in.). (LSX)”
— NOAA / SPC storm report
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
Wind reports
1 report Wind gust 60 mph
Saint Ann St. Louis County
“power outage as the wind gust moved in. (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.
Hail was reported over 411 minutes, from to .
Reports came from Harvester, Bridgeton, Chesterfield, Town And Country, Clarkson Valley, and Saint John — beyond Saint Charles itself.
Severe hail signal
What 2.5" hail means for Saint Charles roofs.
Two-inch-plus hail is capable of puncturing shingles, breaking skylights or windows, and heavily denting soft materials. The strongest radar bands warrant prompt inspection, but neither the signal nor the footprint confirms damage at a specific address.
Radar reading · not confirmed damage
Roofing exposure
What this storm is worth to a roofer.
16,446 homes × $12,000 avg. claim
Potential roof exposure
$197M
Potential roof exposure — 16,446 homes × the ~$12,000 industry-average hail roof claim. Exposure, not confirmed damage.
- Illustrative jobs
- 82 jobs
- Illustrative work
- ~$1.2M
Close just 0.5% of the 16,446 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 $3,454 on top of the $150 plan.
Saint Charles hail history
Other storms in Saint Charles.
11 recorded storm days in Saint Charles, MO
Estimated-size surface Storm date Saint Charles / MO
Aug 16, 2026
0.75" Estimated 0.75"
No ground reports filed Open report →
Estimated-size surface Storm date Saint Charles / MO
Aug 12, 2026
0.75" Estimated 0.75"
No ground reports filed Open report →
Estimated-size surface Storm date Saint Charles / MO
Jul 10, 2026
1" Signatures 1" Estimated 0.5"
1 ground report Open report →
Estimated-size surface Storm date Saint Charles / MO
Jul 4, 2026
1" Signatures 1" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date Saint Charles / MO
Jun 25, 2026
0.75" Estimated 0.75"
No ground reports filed Open report →
Estimated-size surface Storm date Saint Charles / MO
Jun 11, 2026
0.5" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date Saint Charles / MO
May 31, 2026
1" Signatures 1" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date Saint Charles / MO
May 3, 2026
2.5" Signatures 2.5" Estimated 1.5"
No ground reports filed Open report →
Estimated-size surface Storm date Saint Charles / MO
Apr 17, 2026
1.75" Signatures 1.75" Estimated 0.75"
12 ground reports Open report →
Estimated-size surface Storm date Saint Charles / MO
Mar 15, 2026
0.75" Signatures 0.75"
No ground reports filed Open report →
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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 17, 2026.