Hail in Griswold Jul 20, 2026
Hit 14 days agoBoth radar surfaces caught this storm: NEXRAD logged 0 hail signatures up to 0", and the radar-estimated size reached 0.75" aloft.
0.75"
≈ penny to nickel · radar-estimated size aloft311
0
none filedThe 9th most severe storm Griswold has seen in the last 12 months
Overview's storm severity score weighs hailstone size, homes in the footprint, and ground-truth reports.
- Hail size
- 19 /100
- Homes exposed
- 50 /100
- Ground truth
- 0 /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 Griswold saw the hail — from two instruments
The maps here read the same storm from two angles — point detections from NEXRAD, and modeled hail size aloft. Where the two disagree is informative: it marks where estimated size outran the signatures, or trailed them.
Where NEXRAD flagged hail as the storm passed — point signatures from the radar, which indicate hail overhead rather than confirm what landed.
The modeled maximum hail size across the swath, derived from radar aloft — the largest stone the storm could have supported, which is not necessarily what reached the ground.
Where Jul 20, 2026 sits in Griswold's hail record
This was Griswold's 11th recorded hail day, arriving 44 days after the Jun 6, 2026 storm. By severity it ranks 9th of the 11 storms we have logged here. Radar put the day's largest stone over Griswold at 0.75" — radar-estimated size aloft.
The Jul 20, 2026 convective day was bigger than Griswold: the same system put hail over 553 other tracked cities, 178 of them in Iowa. Nearest: Oakland (9 miles northwest, up to 0.75"); Cumberland (13 miles east, up to 0.5"); Atlantic (16 miles northeast, up to 0.5").
These maps are stills from Griswold's Jul 20, 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.
The National Weather Service logged no spotter reports for this storm over Griswold. That absence is ordinary — filing a report takes a person on the spot who saw the hail and phoned it in. What stands as the record for this date is the radar above, which caught the storm regardless.
What 0.75" hail means for Griswold roofs
Hail this size sits right at the edge of the National Weather Service severe threshold. Newer roofs usually shrug it off, but aging or already-worn shingles can bruise, and soft metals — vents, flashing, gutters — often show the first dents.
$3.7M
Potential roof exposure — 311 homes × the ~$12,000 industry-average hail roof claim. Exposure, not confirmed damage.Track hail over Griswold on the live map
Radar updates in real time, spotter reports appear on the map as they're filed, and the full Griswold storm history — this Jul 20, 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
11 recorded storm days in Griswold, IA
Other storms in Griswold
Jun 6, 2026
2"
Jun 5, 2026
1.75"
May 31, 2026
1.75"
May 18, 2026
1.5"
May 17, 2026
1"
May 16, 2026
3.5"
Apr 23, 2026
1"
Apr 9, 2026
0.75"
Mar 6, 2026
1"
Mar 5, 2026
1"