This alert expired on 13 August 2026 at 19:34 UTC. It is kept here as a record.
It is the 3rd strongest of the 15 detections recorded within 20 km of this point since 16 March 2026. Another comparable one was recorded here earlier the same day. 6 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 13 at 3:24PM EDT until August 13 at 3:30PM EDT by NWS Boston/Norton MA
An estimated 228,771 people live within 50 km of this point.
Nearby, since 16 March 2026
- August 13, 2026 · score 48 · 13.2 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 43 out of 100, at 78 % 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 | 78% |
| Coordinates | 41.7047, -70.5251 |
| Nearest City | Barnstable (19 km) |
| Population Exposed | 228.8K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-13T19:24:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.70f6d156711c16b01659c1b52d0d6da5 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Barnstable, MA; Plymouth, MA |
| Headline | Severe Thunderstorm Warning issued August 13 at 3:24PM EDT until August 13 at 3:30PM EDT by NWS Boston/Norton MA |
| Expires | 2026-08-13T15:34:00-04:00 |
| SenderName | NWS Boston/Norton MA |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.70f6d156711c16b01659c1b52d0d6da506df8b71.001.1","noaa_urn:oid:2.49.0.1.840.0.e03254e0b8b526ad6507988a1e35690ca7881c84.001.1"] |
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.
Want to know when something happens near Barnstable?
Calamity.live data shows a weather event with CalamityScore 43/100, near Barnstable (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.