Right now
The most recent data we hold from NOAA arrived 70 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 20 May 2026 at 18:30 UTC. It is kept here as a record.
It is the 11th strongest of the 52 detections recorded within 20 km of this point since 17 March 2026. Another comparable one was recorded here earlier the same day. 8 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 20 at 1:43PM EDT until May 20 at 2:30PM EDT by NWS State College PA
An estimated 78,823 people live within 50 km of this point.
Nearby, since 17 March 2026
- September 3, 2026 · score 32 · 11.0 km
- September 4, 2026 · score 32 · 19.5 km
- June 14, 2026 · score 39 · 21.8 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 39 out of 100, at 81 % 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) | 39 / 100 |
| Our confidence | 81% |
| Coordinates | 39.7250, -77.9328 |
| Nearest City | Hagerstown (21 km) |
| Population Exposed | 78.8K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-20T17:43:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.0123b1df5552d75bf9055916bbd0923f |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Franklin, PA; Allegany, MD; Washington, MD; Morgan, WV |
| Headline | Severe Thunderstorm Warning issued May 20 at 1:43PM EDT until May 20 at 2:30PM EDT by NWS State College PA |
| Expires | 2026-05-20T14:30:00-04:00 |
| SenderName | NWS State College PA |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.0123b1df5552d75bf9055916bbd0923f3352ab1b.001.1","noaa_urn:oid:2.49.0.1.840.0.926a9e007d8c7b47ffbce1886d64a542160c56cc.001.1"] |
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.
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