Hail size 1.75"
Humboldt Minnehaha County
“(FSD)”
— NOAA / SPC storm report
/ Storm field report · Minnehaha
Hail in Montrose · Aug 20, 2026
Hit 25 days ago
NEXRAD logged 0 hail signatures up to 0"; the estimated-size surface reached 1" aloft. Open it on the live map to see the swath over the streets.
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Peak hail signal 1" ≈ quarter · radar-estimated size aloft
Homes in the hail footprint 1,182
Ground reports 1 1 hail
Radar surfaces 2 NEXRAD + estimated size
Convective day · Aug 20, 2026 · noon–noon UTC
Severity
The most severe storm Montrose has seen in the last 12 months
Composite score · 3.3 / 10
Storm severity score
Overview's storm severity score weighs hailstone size, homes in the footprint, and ground-truth reports.
3.3 /10
- Peak hail signal
- 25 /100
- Homes exposed
- 61 /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 Montrose saw the hail — from two instruments
Aug 20, 2026 · Montrose, SD
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
0"
Detections
0
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
1"
The storm in context
Where Aug 20, 2026 sits in Montrose's hail record.
This was Montrose's 6th recorded hail day, arriving 1 day after the Aug 19, 2026 storm. By severity it ranks 1st of the 7 storms we have logged here. Radar put the day's largest stone over Montrose at 1" — radar-estimated size aloft.
The Aug 20, 2026 convective day was bigger than Montrose: the same system put hail over 640 other tracked cities, 17 of them in South Dakota. Nearest: Humboldt (7 miles south, up to 1.25"); Parker (14 miles south, up to 2"); Hartford (15 miles south, up to 2").
These maps are stills. In the app this date is one of 7 Montrose 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 reportStorm 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.
Reports came from Humboldt — beyond Montrose itself.
Damage-capable hail signal
What 1" hail means for Montrose roofs.
Quarter-size and larger hail can bruise asphalt mats, remove granules, and dent exposed soft metal. The mapped footprint identifies an inspection priority area — it does not identify which individual roofs, if any, sustained damage.
Radar reading · not confirmed damage
Roofing exposure
What this storm is worth to a roofer.
1,182 homes × $12,000 avg. claim
Potential roof exposure
$14M
Potential roof exposure — 1,182 homes × the ~$12,000 industry-average hail roof claim. Exposure, not confirmed damage.
- Illustrative jobs
- 6 jobs
- Illustrative work
- ~$90K
Close just 0.5% of the 1,182 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
August 2028
Claims from this storm can typically be filed until around August 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 $248 on top of the $150 plan.
Montrose hail history
Other storms in Montrose.
7 recorded storm days in Montrose, SD
Map unavailable
NEXRAD surface Storm date Montrose / SD
Aug 28, 2026
0.5" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date Montrose / SD
Aug 19, 2026
0.5" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date Montrose / SD
Jul 25, 2026
1" Signatures 1" Estimated 0.5"
1 ground report Open report →
Estimated-size surface Storm date Montrose / SD
Jun 30, 2026
No ground reports filed Open report →
Estimated-size surface Storm date Montrose / SD
Jun 27, 2026
0.5" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date Montrose / SD
Jun 9, 2026
0.5" Estimated 0.5"
No ground reports filed Open report →
Take your next area into the field.
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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 29, 2026.