This alert is in force until 3 September 2026, 04:00 UTC.
It is the 79th strongest of the 106 detections recorded within 20 km of this point since 27 March 2026. The last comparable one was on 17 August 2026.
What the source measured
NOAA reported: Severe Thunderstorm Watch issued September 2 at 4:56PM EDT until September 3 at 12:00AM EDT by NWS Pittsburgh PA
An estimated 1,247,659 people live within 50 km of this point.
Nearby, since 27 March 2026
- September 2, 2026 · score 46 · 0.0 km
- August 11, 2026 · score 52 · 0.0 km
- August 10, 2026 · score 52 · 0.0 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 46 out of 100, at 85 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 46 / 100 |
| Our confidence | 85% |
| Coordinates | 40.4000, -82.9000 |
| Nearest City | Delaware (18 km) |
| Population Exposed | 1.2M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-02T20:56:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.66eb76e70559e694485e69e0f2bdf5657e69f27e.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Watch |
| Urgency | Future |
| Certainty | Possible |
| AreaDesc | Columbiana, OH; Allegheny, PA; Armstrong, PA; Beaver, PA; Butler, PA; Clarion, PA; Forest, PA; Indiana, PA; Jefferson, PA; Lawrence, PA; Mercer, PA; Venango, PA; Westmoreland, PA; Hancock, WV; Mahoning, OH; Portage, OH; Stark, OH; Trumbull, OH; Crawford, PA |
| Headline | Severe Thunderstorm Watch issued September 2 at 4:56PM EDT until September 3 at 12:00AM EDT by NWS Pittsburgh PA |
| Expires | 2026-09-03T00:00:00-04:00 |
| SenderName | NWS Pittsburgh PA |
| HasExactCoords | false |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.66eb76e70559e694485e69e0f2bdf5657e69f27e.001.1","noaa_urn:oid:2.49.0.1.840.0.67e7d9131bc352d0bc18df3a3c2694243a5f1d1e.001.1"] |
| Heat Gov Event | Heat Advisory |
| Heat Gov Urgency | Expected |
| Heat Gov Certainty | Likely |
| Heat Gov Onset | 2026-09-02T14:28:00-04:00 |
| Heat Gov Expires | 2026-09-02T20:00:00-04:00 |
| Heat Gov AreaDesc | Lucas; Wood; Ottawa; Sandusky; Erie; Lorain; Cuyahoga; Hancock; Seneca; Huron; Medina; Summit; Wyandot; Crawford; Richland; Ashland; Wayne; Marion; Morrow; Knox |
| Heat Gov SenderName | NWS Cleveland OH |
| Heat Gov ZonesUsedForCentroid | 7 |
| Heat Gov ZoneCount | 20 |
| MergedSources | [{"id":"heat_gov_41.0_-82.7_heat_advisory_2026-09-02","source":"heat_gov","severity":"medium","severityValue":50,"timestamp":1788373680000,"latitude":40.98590841441949,"longitude":-82.6787115568297}] |
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 Delaware?
Calamity.live data shows a weather event with CalamityScore 46/100, near Delaware (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.