Hail size 1"
Grinnell Poweshiek County
“Also torrential rainfall causing minor street flooding. (DMX)”
— NOAA / SPC storm report
/ Storm field report · Jasper
Hail in Grinnell · Apr 14, 2026
The estimated-size surface reached 0.75" aloft; NEXRAD logged no point detections over Grinnell that day. Open it on the live map to see the swath over the streets.
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Peak hail signal 0.75" ≈ penny to nickel · radar-estimated size aloft
Homes in the hail footprint 2,041
Ground reports 1 1 hail
Radar surfaces 1 Estimated size only
Convective day · Apr 14, 2026 · noon–noon UTC
Severity
The 2nd most severe storm Grinnell has seen in the last 12 months
Composite score · 3.0 / 10
Storm severity score
Overview's storm severity score weighs hailstone size, homes in the footprint, and ground-truth reports.
3.0 /10
- Peak hail signal
- 19 /100
- Homes exposed
- 66 /100
- Ground truth
- 17 /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 Grinnell saw the hail — from two instruments
Apr 14, 2026 · Grinnell, 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
0.75"
Only the radar-estimated size surface resolved for Apr 14, 2026 — this storm produced no NEXRAD point detections over Grinnell, so there is one map to show, not two.
The storm in context
Where Apr 14, 2026 sits in Grinnell's hail record.
This was Grinnell's 2nd recorded hail day, arriving 15 days after the Mar 30, 2026 storm. By severity it ranks 2nd of the 9 storms we have logged here. Radar put the day's largest stone over Grinnell at 0.75" — radar-estimated size aloft.
The Apr 14, 2026 convective day was bigger than Grinnell: the same system put hail over 476 other tracked cities, 143 of them in Iowa. Nearest: Kellogg (5 miles west, up to 0.75"); Lynnville (7 miles south, up to 0.75"); Sully (9 miles southwest, up to 0.75").
These maps are stills. In the app this date is one of 9 Grinnell 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
1 report 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
1 reportNear the severe threshold
What 0.75" hail means for Grinnell roofs.
A signal this size sits near the National Weather Service severe threshold. Aging shingles and soft metals such as vents, flashing, and gutters may be more vulnerable; roof age, wind, and material condition all matter, and only an inspection can confirm damage.
Radar reading · not confirmed damage
Roofing exposure
What this storm is worth to a roofer.
2,041 homes × $12,000 avg. claim
Potential roof exposure
$24M
Potential roof exposure — 2,041 homes × the ~$12,000 industry-average hail roof claim. Exposure, not confirmed damage.
- Illustrative jobs
- 10 jobs
- Illustrative work
- ~$150K
Close just 0.5% of the 2,041 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
April 2028
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.
Names and phones for every home in the footprint: at most $429 on top of the $150 plan.
Grinnell hail history
Other storms in Grinnell.
9 recorded storm days in Grinnell, IA
Estimated-size surface Storm date Grinnell / IA
Aug 10, 2026
0.75" Estimated 0.75"
No ground reports filed Open report →
Estimated-size surface Storm date Grinnell / IA
Jul 20, 2026
0.5" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date Grinnell / IA
Jul 3, 2026
1" Signatures 1" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date Grinnell / IA
Jun 16, 2026
0.5" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date Grinnell / IA
May 15, 2026
1" Signatures 1" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date Grinnell / IA
Apr 17, 2026
2.5" Signatures 2.5" Estimated 1.5"
2 ground reports Open report →
Estimated-size surface Storm date Grinnell / IA
Apr 15, 2026
0.5" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date Grinnell / IA
Mar 30, 2026
No ground reports filed Open report →
The next storm won’t wait for you.
Set your territory and alerts today. When hail hits, use Overview to choose your streets and get moving.
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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 Aug 11, 2026.