This alert expired on 19 May 2026 at 22:15 UTC. It is kept here as a record.
It is the 5th strongest of the 102 detections recorded within 20 km of this point since 16 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 19 at 5:32PM EDT until May 19 at 6:15PM EDT by NWS Boston/Norton MA
An estimated 2,376,037 people live within 50 km of this point.
Nearby, since 16 March 2026
- March 17, 2026 · score 52 · 7.3 km
- July 2, 2026 · score 52 · 9.6 km
- August 3, 2026 · score 46 · 10.8 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 85 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 52 / 100 |
| Our confidence | 85% |
| Coordinates | 42.3490, -71.6840 |
| Nearest City | Shrewsbury (6 km) |
| Population Exposed | 2.4M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-19T21:32:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.4379e0057eddd0134a92735f0f33972f |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Hampden, MA; Worcester, MA; Middlesex, MA; Norfolk, MA; Worcester, MA |
| Headline | Severe Thunderstorm Warning issued May 19 at 5:32PM EDT until May 19 at 6:15PM EDT by NWS Boston/Norton MA |
| Expires | 2026-05-19T18:15:00-04:00 |
| SenderName | NWS Boston/Norton MA |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.4379e0057eddd0134a92735f0f33972fe55463e4.002.1","noaa_urn:oid:2.49.0.1.840.0.6281f34df2248d07a4bb606452de3af456af8622.001.1"] |
| Google News RssFeed | weather |
| Google News SourceName | WCVB |
| MergedSources | [{"id":"gnews_weather_494224_118","source":"google_news","severity":"medium","severityValue":40,"timestamp":1779207960000,"latitude":42.36,"longitude":-71.06}] |
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 10 February 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 Shrewsbury?
Calamity.live data shows a weather event with CalamityScore 52/100, near Shrewsbury (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.