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
Hail in Saint Charles Apr 27, 2026
Both radar surfaces caught this storm: NEXRAD logged 28 hail signatures up to 2.5", and the radar-estimated size reached 1.5" aloft. At 2.5" — baseball — this is severe, roof-replacing hail: close to every roof inside the footprint becomes a claim candidate.
Largest hailstone
2.5"
≈ baseball · the largest NEXRAD radar signature Homes in the hail footprint
16,446
Ground reports
14
13 hail · 1 windThe most severe storm Saint Charles has seen in the last 12 months
Storm severity score
Overview's storm severity score weighs hailstone size, homes in the footprint, and ground-truth reports.
7.4 /10
- Hail size
- 63 /100
- Homes exposed
- 84 /100
- Ground truth
- 100 /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 Saint Charles saw the hail — from two instruments
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
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
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"
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 9 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: Hazelwood (5 miles east, up to 2"); Saint Peters (5 miles west, up to 1.25"); Golden Eagle (9 miles northwest, up to 1").
These maps are stills from Saint Charles's Apr 27, 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.
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
Read from the arrival times and locations of the NOAA ground reports,
not a radar-measured storm track.
How the storm moved
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.
What 2.5" hail means for Saint Charles roofs
Two-inch-plus hail punctures shingles, breaks skylights and windows, and dents anything soft. In the core of a footprint like this, close to every roof is a candidate for an insurance claim. Speed decides who writes those jobs.
What this storm is worth to a roofer
$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
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.
Track hail over Saint Charles on the live map
Radar updates in real time, spotter reports appear on the map as they're filed, and the full Saint Charles storm history — this Apr 27, 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
Saint Charles hail history
← All hail in Saint Charles 9 recorded storm days in Saint Charles, MO
Other storms in Saint Charles
Jul 10, 2026
1" Signatures 1" Estimated 0.5"
1
ground report 
Jul 4, 2026
1" Signatures 1" Estimated 0.5"
No ground reports filed 
Jun 25, 2026
0.75" Estimated 0.75"
No ground reports filed 
Jun 11, 2026
0.5" Estimated 0.5"
No ground reports filed 
May 31, 2026
1" Signatures 1" Estimated 0.5"
No ground reports filed 
May 3, 2026
2.5" Signatures 2.5" Estimated 1.5"
No ground reports filed 
Apr 17, 2026
1.75" Signatures 1.75" Estimated 0.75"
12
ground reports 
Mar 15, 2026
0.75" Signatures 0.75"
No ground reports filed
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 surfaces are detections and estimates,
not confirmed damage. Last updated Aug 3, 2026.