Reported by SPC 6 days ago.
It is the 5th strongest of the 87 detections recorded within 20 km of this point since 9 March 2026. Another comparable one was recorded here earlier the same day.
What the source measured
SPC reported: Hail 100 in near 1 ESE Groton, Tompkins, NY. (BGM)
An estimated 76,680 people live within 50 km of this point.
Nearby, since 9 March 2026
- August 28, 2026 · score 45 · 0.0 km
- May 13, 2026 · score 43 · 8.3 km
- May 13, 2026 · score 39 · 11.9 km
How we know
Confirmed by 2 independent sources, including SPC.
Our own score for this event is 45 out of 100, at 90 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | High |
| Calamity Score (ours) | 45 / 100 |
| Our confidence | 90% |
| Coordinates | 42.5800, -76.3500 |
| Nearest City | Cortland (14 km) |
| Population Exposed | 76.7K within 50 km |
| Impact Tier | severe |
| Timestamp | 2026-08-27T18:35:00.000Z |
| Source | https://www.spc.noaa.gov/climo/reports/today.html |
Score Breakdown
Technical Details
| ReportType | hail |
| Speed | 100 |
| Location | 1 ESE Groton |
| County | Tompkins |
| State | NY |
| Comments | (BGM) |
| Iem TypeSummary | H |
| Iem Magnitude | 1 |
| Iem Unit | Inch |
| Iem City | 1 ESE Groton |
| Iem County | Tompkins |
| Iem State | NY |
| Iem Wfo | BGM |
| MergedSources | [{"id":"iem_H_42.580_-76.350_1787855700000","source":"iem","severity":"low","severityValue":25,"timestamp":1787855700000,"latitude":42.58,"longitude":-76.35}] |
Safety Information
Always follow official guidance from your local emergency management agency. This platform provides scientific monitoring data and is not a substitute for official warnings. If you are in immediate danger, contact your local emergency number.
Series begins 8 March 2026. Comparisons refer to that period only. Collection gap: 14-26 August 2026.
This data is aggregated algorithmically from scientific sources. Not a replacement for official emergency warnings.
Want to know when something happens near Cortland?
Calamity.live data shows a weather event with CalamityScore 45/100, near Cortland (United States), based on data from spc. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.