Hail size 1.5"
2 N Attica Marion County
“Delayed report - time estimated from radar. (DMX)”
— NOAA / SPC storm report
/ Storm field report · Marion
Hail in Knoxville · Jun 11, 2026
The estimated-size surface reached 2.75" aloft; NEXRAD logged no point detections over Knoxville that day. At 2.75" — 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 2.75" ≈ baseball · radar-estimated size aloft
Homes in the hail footprint 8,505
Ground reports 7 6 hail · 1 wind
Radar surfaces 1 Estimated size only
Convective day · Jun 11, 2026 · noon–noon UTC
Severity
The most severe storm Knoxville has seen in the last 12 months
Composite score · 7.6 / 10
Storm severity score
Overview's storm severity score weighs hailstone size, homes in the footprint, and ground-truth reports.
7.6 /10
- Peak hail signal
- 69 /100
- Homes exposed
- 79 /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 Knoxville saw the hail — from two instruments
Jun 11, 2026 · Knoxville, IA
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 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
2.75"
Only the radar-estimated size surface resolved for Jun 11, 2026 — this storm produced no NEXRAD point detections over Knoxville, so there is one map to show, not two.
The storm in context
Where Jun 11, 2026 sits in Knoxville's hail record.
This was Knoxville's 6th recorded hail day, arriving 1 day after the Jun 10, 2026 storm. By severity it ranks 1st of the 11 storms we have logged here. Radar put the day's largest stone over Knoxville at 2.75" — radar-estimated size aloft.
The Jun 11, 2026 convective day was bigger than Knoxville: the same system put hail over 648 other tracked cities, 147 of them in Iowa. Nearest: Tracy (5 miles east, up to 2.25"); Hamilton (7 miles south, up to 2.75"); Bussey (9 miles southeast, up to 3").
These maps are stills. In the app this date is one of 11 Knoxville 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
7 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 1.75"
2 N Attica Marion County
“Pershing IOWA. (DMX)”
— NOAA / SPC storm report
Hail size 1.75"
Knoxville Marion County
“Report relayed from NWS Chat. (DMX)”
— NOAA / SPC storm report
Hail size 1.75"
1 SSW Knoxville Marion County
“Report relayed from NWS Chat. (DMX)”
— NOAA / SPC storm report
Hail size 1"
2 S Knoxville Marion County
“Time estimated from radar. (DMX)”
— NOAA / SPC storm report
Hail size 1"
1 NNW Knoxville Marion County
“(DMX)”
— NOAA / SPC storm report
Wind reports
1 report Wind gust 61 mph
2 SSW Knoxville Marion County
“(DMX)”
— 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 58 minutes, from to .
Reports came from Attica — beyond Knoxville itself.
Severe hail signal
What 2.75" hail means for Knoxville 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.
8,505 homes × $12,000 avg. claim
Potential roof exposure
$102M
Potential roof exposure — 8,505 homes × the ~$12,000 industry-average hail roof claim. Exposure, not confirmed damage.
- Illustrative jobs
- 43 jobs
- Illustrative work
- ~$645K
Close just 0.5% of the 8,505 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
June 2028
Claims from this storm can typically be filed until around June 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 $1,786 on top of the $150 plan.
Knoxville hail history
Other storms in Knoxville.
11 recorded storm days in Knoxville, IA
Map unavailable
NEXRAD surface Storm date Knoxville / IA
Sep 8, 2026
0.5" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date Knoxville / IA
Aug 13, 2026
0.5" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date Knoxville / IA
Aug 12, 2026
0.5" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date Knoxville / IA
Jul 20, 2026
1.75" Estimated 1.75"
No ground reports filed Open report →
Estimated-size surface Storm date Knoxville / IA
Jul 3, 2026
1.75" Signatures 1.75" Estimated 0.75"
1 ground report Open report →
Estimated-size surface Storm date Knoxville / IA
Jun 10, 2026
0.5" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date Knoxville / IA
Jun 5, 2026
2.5" Signatures 2.5" Estimated 2"
5 ground reports Open report →
Estimated-size surface Storm date Knoxville / IA
May 18, 2026
0.5" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date Knoxville / IA
May 15, 2026
1" Signatures 1" Estimated 0.75"
No ground reports filed Open report →
Estimated-size surface Storm date Knoxville / IA
Apr 17, 2026
1.5" Signatures 1.5" Estimated 0.75"
1 ground report 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 Sep 9, 2026.