Tornado Rating unknown
2 NW Little Sioux Harrison County
“EM reported a tornado touchdown. (OAX)”
— NOAA / SPC storm report
Hail in Mondamin Apr 23, 2026
Both radar surfaces caught this storm: NEXRAD logged 21 hail signatures up to 2.75", and the radar-estimated size reached 1.5" aloft. At 2.75" — baseball — 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
2.75"
≈ baseball · the largest NEXRAD radar signature Homes in the hail footprint
440
Ground reports
4
1 hail · 3 tornadoThe most severe storm Mondamin 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.
6.9 /10
- Hail size
- 69 /100
- Homes exposed
- 53 /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 Mondamin 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
2.75"
Detections
21
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 23, 2026 sits in Mondamin's hail record
This was Mondamin's 2nd recorded hail day, arriving 8 days after the Apr 15, 2026 storm. By severity it ranks 1st of the 8 storms we have logged here. Radar put the day's largest stone over Mondamin at 2.75" — the largest NEXRAD radar signature.
The Apr 23, 2026 convective day was bigger than Mondamin: the same system put hail over 703 other tracked cities, 252 of them in Iowa. Nearest: Tekamah (8 miles northwest, up to 2.75"); Herman (8 miles southwest, up to 2.5"); Pisgah (8 miles northeast, up to 2.25").
These maps are stills from Mondamin'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
2 N Little Sioux Harrison County
“A tornado developed approximately 1.5 miles north-northwest of Little Sioux at 1:46 PM. The tornado began just southeast of the intersection of 120th Street and Dayton (OAX)”
— NOAA / SPC storm report
Tornado Rating unknown
2 N Little Sioux Harrison County
“EM relayed reports of numerous power lines down and roofs off of buildings along 120th St. Time is estimated from radar. (OAX)”
— NOAA / SPC storm report
Hail reports
1 report Hail size 1.25"
2 NE Little Sioux Harrison County
“Delayed report from spotter of approximately half dollar size hail 4 miles west of Pisgah. (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
Hail was reported over 74 minutes, from to .
Reports came from Little Sioux — beyond Mondamin itself.
What 2.75" hail means for Mondamin 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
$5.3M
Potential roof exposure — 440 homes × the ~$12,000 industry-average hail roof claim. Exposure, not confirmed damage.
Illustrative jobs
2 jobs
Illustrative work
~$30K
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 Mondamin on the live map
Radar updates in real time, spotter reports appear on the map as they're filed, and the full Mondamin 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
Mondamin hail history
← All hail in Mondamin 8 recorded storm days in Mondamin, IA
Other storms in Mondamin
Jul 8, 2026
1.75" Signatures 1.75" Estimated 1"
No ground reports filed 
Jul 3, 2026
1.75" Signatures 1.75" Estimated 0.75"
No ground reports filed 
Jul 1, 2026
1" Signatures 1" Estimated 0.75"
No ground reports filed 
May 31, 2026
2.5" Signatures 2.5" Estimated 1.5"
No ground reports filed 
May 17, 2026
May 15, 2026
1.75" Signatures 1.75" Estimated 1"
No ground reports filed 
Apr 15, 2026
2" Estimated 2"
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.