Tornado Rating unknown
2 E Riverton Fremont County
“(OAX)”
— NOAA / SPC storm report
Hail in Hamburg Apr 23, 2026
Both radar surfaces caught this storm: NEXRAD logged 19 hail signatures up to 2", and the radar-estimated size reached 1" aloft. At 2" — tennis ball — this is severe, roof-replacing hail: close to every roof inside the footprint becomes a claim candidate.
A tornado was also reported to the National Weather Service during this storm — see the ground reports below.
Largest hailstone
2"
≈ tennis ball · the largest NEXRAD radar signature Homes in the hail footprint
563
Ground reports
3
3 tornadoThe most severe storm Hamburg 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.
5.9 /10
- Hail size
- 50 /100
- Homes exposed
- 55 /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 Hamburg saw the hail — from two instruments
We map this storm two ways: the NEXRAD radar signatures the storm produced overhead, and the radar-estimated size of the hail in the air. The two surfaces don’t have to match — where they diverge is where estimated size aloft ran ahead of, or behind, what the signatures caught.
NEXRAD radar signatures
NEXRAD radar signatures — the point detections the storm produced overhead. A signature is where the radar saw hail, not a confirmed stone on the ground.
Max size
2"
Detections
19
Radar-estimated hail size
Maximum hail size as estimated from radar aloft. Treat it as the storm's ceiling — the largest supportable stone — rather than a ground measurement.
Max size
1"
Where Apr 23, 2026 sits in Hamburg's hail record
This was Hamburg's 3rd recorded hail day, arriving 20 days after the Apr 3, 2026 storm. By severity it ranks 1st of the 10 storms we have logged here. Radar put the day's largest stone over Hamburg at 2" — the largest NEXRAD radar signature.
The Apr 23, 2026 convective day was bigger than Hamburg: the same system put hail over 703 other tracked cities, 252 of them in Iowa. Nearest: Farragut (6 miles northeast, up to 1.75"); Sidney (7 miles north, up to 2"); Watson (10 miles south, up to 2.25").
These maps are stills from Hamburg's Apr 23, 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.
Tornado reports
3 reports Tornado Rating unknown
5 SE Riverton Fremont County
“Several videos and photographs from multiple angles indicated that a weak tornado developed and moved to the east northeast along this approximate path. While the near- (OAX)”
— NOAA / SPC storm report
Tornado Rating unknown
5 SE Riverton Fremont County
“Video and photo evidence of a small tornado near this location. (OAX)”
— 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
Reports came from Riverton — beyond Hamburg itself.
What 2" hail means for Hamburg 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
$6.8M
Potential roof exposure — 563 homes × the ~$12,000 industry-average hail roof claim. Exposure, not confirmed damage.
Illustrative jobs
3 jobs
Illustrative work
~$45K
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 Hamburg on the live map
Radar updates in real time, spotter reports appear on the map as they're filed, and the full Hamburg storm history — this Apr 23, 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
Hamburg hail history
← All hail in Hamburg 10 recorded storm days in Hamburg, IA
Other storms in Hamburg
Jul 8, 2026
1" Signatures 1" Estimated 0.5"
No ground reports filed 
Jul 3, 2026
2.5" Signatures 2.5" Estimated 1.5"
1
ground report 
Jun 30, 2026
Jun 10, 2026
1.5" Estimated 1.5"
No ground reports filed 
May 18, 2026
2.25" Signatures 2.25" Estimated 1.25"
1
ground report 
May 17, 2026
1.75" Signatures 1.75" Estimated 0.5"
No ground reports filed 
May 16, 2026
1.75" Signatures 1.75" Estimated 0.75"
No ground reports filed 
Apr 3, 2026
1.25" Signatures 1.25" Estimated 0.5"
No ground reports filed 
Mar 6, 2026
1" Signatures 1"
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.