Hail in Flandreau · May 17, 2026
NEXRAD logged 2 hail signatures up to 0.5"; the estimated-size surface had no signal that day. Open it on the live map to see the swath over the streets.
7-day free trial in the iPhone app. No card required to start.
For iPhone. Android coming soon.
Web trial: 7 days free. Card required. $150/month after the trial unless cancelled.
Convective day · May 17, 2026 · noon–noon UTC
Severity
The 6th most severe storm Flandreau has seen in the last 12 months
Overview's storm severity score weighs hailstone size, homes in the footprint, and ground-truth reports.
- Peak hail signal
- 13 /100
- Homes exposed
- 32 /100
- Ground truth
- 0 /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 Flandreau 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.
Radar signature field 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.
Only the NEXRAD radar-signature surface resolved for May 17, 2026 — the estimated-size swath had no hail signal to model for this storm, so there is one map to show, not two.
The storm in context
Where May 17, 2026 sits in Flandreau's hail record.
This was Flandreau's 1st recorded hail day — the first hail day in our records for the city. By severity it ranks 6th of the 7 storms we have logged here. Radar put the day's largest stone over Flandreau at 0.5" — the largest NEXRAD radar signature.
The May 17, 2026 convective day was bigger than Flandreau: the same system put hail over 894 other tracked cities, 49 of them in South Dakota. Nearest: Pipestone (14 miles northeast, up to 0.5"); Edgerton (20 miles southeast, up to 2.5"); Holland (20 miles east, up to 1").
These maps are stills. In the app this date is one of 7 Flandreau 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
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.
For this storm over Flandreau, the NWS report log is empty — a common outcome, since ground reports only happen when someone witnesses the hail and takes the time to call it in. The detection record for the date lives in the radar maps above.
Below the severe threshold
What 0.5" hail means for Flandreau roofs.
Radar signals under three-quarters of an inch stay below the National Weather Service severe threshold and generally indicate lower roof risk. Older or already-worn materials can still show effects, but radar alone cannot determine whether a specific roof was damaged.
Radar reading · not confirmed damage
Roofing exposure
What this storm is worth to a roofer.
Potential roof exposure
$480K
Potential roof exposure — 40 homes × the ~$12,000 industry-average hail roof claim. Exposure, not confirmed damage.
Claim window
May 2028
Claims from this storm can typically be filed until around May 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 $8 on top of the $150 plan.
Flandreau hail history
Other storms in Flandreau.
Estimated-size surface Aug 6, 2026
0.5"
Estimated-size surface Jul 7, 2026
1"
Estimated-size surface Jul 2, 2026
2.5"
Estimated-size surface Jun 29, 2026
1"
Estimated-size surface Jun 27, 2026
Estimated-size surface May 24, 2026
1.25"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.
7-day free trial in the iPhone app. No card required to start.
For iPhone. Android coming soon.
Web trial: 7 days free. Card required. $150/month after the trial unless cancelled.