This alert expired on 13 May 2026 at 22:00 UTC. It is kept here as a record.
It is the 44th strongest of the 80 detections recorded within 20 km of this point since 31 March 2026. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 13 at 5:31PM EDT until May 13 at 6:00PM EDT by NWS Buffalo NY
An estimated 220,822 people live within 50 km of this point.
Nearby, since 31 March 2026
- May 13, 2026 · score 39 · 6.5 km
- August 28, 2026 · score 45 · 8.3 km
- August 27, 2026 · score 45 · 8.3 km
How we know
Confirmed by 11 independent sources, including NOAA.
Our own score for this event is 43 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 | Medium |
| Calamity Score (ours) | 43 / 100 |
| Our confidence | 90% |
| Coordinates | 42.6506, -76.3818 |
| Nearest City | Cortland (17 km) |
| Population Exposed | 220.8K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-13T21:31:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.997b99b889492ee74791cd1004819902 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Jefferson, NY; Lewis, NY; Oswego, NY; Onondaga, NY; Chemung, NY; Steuben, NY; Bradford, PA and 1 more areas |
| Headline | Severe Thunderstorm Warning issued May 13 at 5:31PM EDT until May 13 at 6:00PM EDT by NWS Buffalo NY |
| Expires | 2026-05-13T18:00:00-04:00 |
| SenderName | NWS Buffalo NY |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.997b99b889492ee74791cd10048199027bcf19dc.001.1","noaa_urn:oid:2.49.0.1.840.0.9dfcb8e595de819d8138b998555ffa69ee34aeaf.002.1","noaa_urn:oid:2.49.0.1.840.0.a6a5e8962a90345f5c8486fa829775605c20276e.001.1","noaa_urn:oid:2.49.0.1.840.0.60d5e3f9f42e0f235bdc7718b86aa3524418daf7.001.1"] |
| Iem TypeSummary | H |
| Iem Magnitude | 0.25 |
| Iem Unit | Inch |
| Iem City | Marcellus |
| Iem County | Onondaga |
| Iem State | NY |
| Iem Wfo | BGM |
| MergedSources | [{"id":"iem_H_42.950_-76.430_1778704920000","source":"iem","severity":"low","severityValue":25,"timestamp":1778704920000,"latitude":42.95,"longitude":-76.43},{"id":"iem_D_42.990_-76.580_1778704200000","source":"iem","severity":"low","severityValue":25,"timestamp":1778704200000,"latitude":42.99,"longitude":-76.58},{"id":"iem_D_43.060_-76.870_1778702820000","source":"iem","severity":"low","severityValue":25,"timestamp":1778702820000,"latitude":43.06,"longitude":-76.87},{"id":"iem_D_42.890_-76.990_1778702160000","source":"iem","severity":"low","severityValue":25,"timestamp":1778702160000,"latitude":42.89,"longitude":-76.99},{"id":"iem_H_43.110_-76.150_1778706780000","source":"iem","severity":"low","severityValue":25,"timestamp":1778706780000,"latitude":43.11,"longitude":-76.15},{"id":"iem_H_42.900_-76.910_1778702280000","source":"iem","severity":"low","severityValue":25,"timestamp":1778702280000,"latitude":42.9,"longitude":-76.91},{"id":"iem_D_42.940_-76.550_1778704200000","source":"iem","severity":"low","severityValue":25,"timestamp":1778704200000,"latitude":42.94,"longitude":-76.55},{"id":"iem_H_42.930_-76.570_1778701500000","source":"iem","severity":"low","severityValue":25,"timestamp":1778701500000,"latitude":42.93,"longitude":-76.57},{"id":"iem_H_42.980_-76.450_1778704680000","source":"iem","severity":"low","severityValue":25,"timestamp":1778704680000,"latitude":42.98,"longitude":-76.45},{"id":"iem_H_42.980_-76.340_1778705280000","source":"iem","severity":"low","severityValue":25,"timestamp":1778705280000,"latitude":42.98,"longitude":-76.34}] |
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 43/100, near Cortland (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.