Right now
The most recent data we hold from NOAA arrived 12 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 13 May 2026 at 22:08 UTC. It is kept here as a record.
It is the 63rd strongest of the 209 detections recorded within 20 km of this point since 31 March 2026. Another comparable one was recorded here earlier the same day. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 13 at 5:58PM EDT until May 13 at 6:00PM EDT by NWS State College PA
An estimated 49,695 people live within 50 km of this point.
Nearby, since 31 March 2026
- July 28, 2026 · score 39 · 9.1 km
- September 3, 2026 · score 49 · 13.6 km
- June 18, 2026 · score 63 · 14.6 km
How we know
Confirmed by 12 independent sources, including NOAA.
Our own score for this event is 34 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) | 34 / 100 |
| Our confidence | 90% |
| Coordinates | 42.4784, -76.4662 |
| Nearest City | Ithaca (5 km) |
| Population Exposed | 49.7K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-13T21:58:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.90d8ae6d9a9d677204fb9e3165d168de |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Tioga, PA; Chemung, NY; Bradford, PA; Jefferson, NY; Lewis, NY; Oswego, NY |
| Headline | Severe Thunderstorm Warning issued May 13 at 5:58PM EDT until May 13 at 6:00PM EDT by NWS State College PA |
| Expires | 2026-05-13T18:08:00-04:00 |
| SenderName | NWS State College PA |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.90d8ae6d9a9d677204fb9e3165d168de56d35607.001.1","noaa_urn:oid:2.49.0.1.840.0.735dbf7746986d7e4a0eedbae8de742ea4d95ea1.002.1","noaa_urn:oid:2.49.0.1.840.0.997b99b889492ee74791cd10048199027bcf19dc.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_42.380_-77.360_1778701380000","source":"iem","severity":"low","severityValue":25,"timestamp":1778701380000,"latitude":42.38,"longitude":-77.36},{"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 Ithaca?
Calamity.live data shows a weather event with CalamityScore 34/100, near Ithaca (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.