Hail size 1.5"
3 NE Fredonia Mercer County
“Public shared a picture of ping pong ball size hail on social media. Time estimated based off radar. (PBZ)”
— NOAA / SPC storm report
/ Storm field report · Mercer
Hail in Mercer · Apr 15, 2026
The estimated-size surface reached 1.75" aloft; NEXRAD logged no point detections over Mercer that day. Open it on the live map to see the swath over the streets.
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Peak hail signal 1.75" ≈ golf ball · radar-estimated size aloft
Homes in the hail footprint 3,446
Ground reports 1 1 hail
Radar surfaces 1 Estimated size only
Convective day · Apr 15, 2026 · noon–noon UTC
Severity
The most severe storm Mercer has seen in the last 12 months
Composite score · 4.6 / 10
Storm severity score
Overview's storm severity score weighs hailstone size, homes in the footprint, and ground-truth reports.
4.6 /10
- Peak hail signal
- 44 /100
- Homes exposed
- 71 /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 Mercer saw the hail — from two instruments
Apr 15, 2026 · Mercer, PA
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.
Radar-estimated hail size Surface resolved
Estimated size field 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.
Max size
1.75"
Only the radar-estimated size surface resolved for Apr 15, 2026 — this storm produced no NEXRAD point detections over Mercer, so there is one map to show, not two.
The storm in context
Where Apr 15, 2026 sits in Mercer's hail record.
This was Mercer's 2nd recorded hail day, arriving 24 days after the Mar 22, 2026 storm. By severity it ranks 1st of the 8 storms we have logged here. Radar put the day's largest stone over Mercer at 1.75" — radar-estimated size aloft.
The Apr 15, 2026 convective day was bigger than Mercer: the same system put hail over 425 other tracked cities, 25 of them in Pennsylvania. Nearest: Stoneboro (5 miles east, up to 2"); Clarks Mills (7 miles north, up to 1.75"); Greenville (9 miles northwest, up to 1.75").
These maps are stills. In the app this date is one of 8 Mercer 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 Fredonia — beyond Mercer itself.
High damage potential
What 1.75" hail means for Mercer 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.
3,446 homes × $12,000 avg. claim
Potential roof exposure
$41M
Potential roof exposure — 3,446 homes × the ~$12,000 industry-average hail roof claim. Exposure, not confirmed damage.
- Illustrative jobs
- 17 jobs
- Illustrative work
- ~$255K
Close just 0.5% of the 3,446 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 $724 on top of the $150 plan.
Mercer hail history
Other storms in Mercer.
8 recorded storm days in Mercer, PA
Estimated-size surface Storm date Mercer / PA
Sep 3, 2026
0.5" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date Mercer / PA
Sep 2, 2026
0.5" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date Mercer / PA
Jul 10, 2026
1" Signatures 1" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date Mercer / PA
Jul 4, 2026
1.25" Signatures 1.25" Estimated 0.5"
No ground reports filed Open report →
Estimated-size surface Storm date Mercer / PA
Jul 3, 2026
1.75" Signatures 1.75" Estimated 0.75"
No ground reports filed Open report →
Estimated-size surface Storm date Mercer / PA
May 13, 2026
0.75" Signatures 0.75"
No ground reports filed Open report →
Estimated-size surface Storm date Mercer / PA
Mar 22, 2026
1" Signatures 1"
No ground reports filed Open report →
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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 Sep 4, 2026.