Hail size 1"
Derby Sedgwick County
“(ICT)”
— NOAA / SPC storm report
/ Storm field report · Sedgwick
Hail in Derby · Apr 17, 2026
NEXRAD logged 10 hail signatures up to 1.5"; the estimated-size surface reached 0.75" aloft. Open it on the live map to see the swath over the streets.
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Peak hail signal 1.5" ≈ ping-pong ball · the largest NEXRAD radar signature
Homes in the hail footprint 8,636
Ground reports 3 3 hail
Radar surfaces 2 NEXRAD + estimated size
Convective day · Apr 17, 2026 · noon–noon UTC
Severity
The 2nd most severe storm Derby has seen in the last 12 months
Composite score · 5.0 / 10
Storm severity score
Overview's storm severity score weighs hailstone size, homes in the footprint, and ground-truth reports.
5.0 /10
- Peak hail signal
- 38 /100
- Homes exposed
- 79 /100
- Ground truth
- 50 /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 Derby saw the hail — from two instruments
Apr 17, 2026 · Derby, KS
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 Surface resolved
Radar signature field 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
1.5"
Detections
10
Radar-estimated hail size Surface resolved
Estimated size field 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
0.75"
The storm in context
Where Apr 17, 2026 sits in Derby's hail record.
This was Derby's 4th recorded hail day, arriving 14 days after the Apr 3, 2026 storm. By severity it ranks 2nd of the 6 storms we have logged here. Radar put the day's largest stone over Derby at 1.5" — the largest NEXRAD radar signature.
The Apr 17, 2026 convective day was bigger than Derby: the same system put hail over 1,016 other tracked cities, 144 of them in Kansas. Nearest: Wichita (5 miles west, up to 2.25"); Rose Hill (5 miles east, up to 1.75"); Mulvane (9 miles southwest, up to 2").
These maps are stills. In the app this date is one of 6 Derby 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
3 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
3 reports Hail size 1.75"
Derby Sedgwick County
“Golf ball sized hail sent via mPING. (ICT)”
— NOAA / SPC storm report
Hail size 1"
2 WNW Rose Hill Sedgwick County
“(ICT)”
— 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 16 minutes, from to .
Reports came from Rose Hill — beyond Derby itself.
High damage potential
What 1.5" hail means for Derby roofs.
Hail around an inch and a half is capable of cracking shingles, stripping granules, and denting gutters, vents, and siding. Risk is usually greatest near the strongest radar signal, but property-level damage still requires an on-site inspection.
Radar reading · not confirmed damage
Roofing exposure
What this storm is worth to a roofer.
8,636 homes × $12,000 avg. claim
Potential roof exposure
$104M
Potential roof exposure — 8,636 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 8,636 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 $1,814 on top of the $150 plan.
Estimated-size surface Storm date Derby / KS
Jun 25, 2026
1" Signatures 1" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date Derby / KS
Apr 25, 2026
2.5" Signatures 2.5" Estimated 0.75"
1 ground report Open report →
Estimated-size surface Storm date Derby / KS
Apr 3, 2026
1.75" Signatures 1.75" Estimated 0.75"
No ground reports filed Open report →
Estimated-size surface Storm date Derby / KS
Mar 5, 2026
1" Signatures 1" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date Derby / KS
Mar 3, 2026
1" Signatures 1" Estimated 0.5"
No ground reports filed Open report →
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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 2, 2026.