This alert expired on 19 July 2026 at 01:30 UTC. It is kept here as a record.
It is the 2nd strongest of the 103 detections recorded within 20 km of this point since 27 March 2026. The last comparable one was on 18 July 2026. 8 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Watch issued July 18 at 8:18PM EDT until July 18 at 9:00PM EDT by NWS Pittsburgh PA
An estimated 1,247,659 people live within 50 km of this point.
Nearby, since 27 March 2026
- August 11, 2026 · score 52 · 0.0 km
- August 10, 2026 · score 52 · 0.0 km
- August 9, 2026 · score 52 · 0.0 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 52 out of 100, at 79 % 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 | 79% |
| Coordinates | 40.4000, -82.9000 |
| Nearest City | Delaware (18 km) |
| Population Exposed | 1.2M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-19T00:18:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Watch_noaa_urn:oid:2.49.0.1.840.0.0b225db6cf68147b9ea7afa3f32342be |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Watch |
| Urgency | Future |
| Certainty | Possible |
| AreaDesc | Belmont, OH; Carroll, OH; Columbiana, OH; Coshocton, OH; Guernsey, OH; Harrison, OH; Jefferson, OH; Monroe, OH; Muskingum, OH; Noble, OH; Tuscarawas, OH; Allegheny, PA; Armstrong, PA; Beaver, PA; Butler, PA; Clarion, PA; Fayette, PA; Greene, PA; Indiana, PA; Jefferson, PA; Lawrence, PA; Washington, PA; Westmoreland, PA; Brooke, WV; Hancock, WV; Marion, WV; Marshall, WV; Monongalia, WV; Ohio, WV; Preston, WV; Wetzel, WV; Ashland, OH; Ashtabula, OH; Crawford, OH; Cuyahoga, OH; Erie, OH; Geauga, OH; Holmes, OH; Huron, OH; Knox, OH; Lake, OH; Lorain, OH; Mahoning, OH; Marion, OH; Medina, OH; Morrow, OH; Ottawa, OH; Portage, OH; Richland, OH; Sandusky, OH; Seneca, OH; Stark, OH; Summit, OH; Trumbull, OH; Wayne, OH; Wyandot, OH; Crawford, PA; Erie, PA |
| Headline | Severe Thunderstorm Watch issued July 18 at 8:18PM EDT until July 18 at 9:00PM EDT by NWS Pittsburgh PA |
| Expires | 2026-07-18T21:30:00-04:00 |
| SenderName | NWS Pittsburgh PA |
| HasExactCoords | false |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.0b225db6cf68147b9ea7afa3f32342bedef42e50.002.1","noaa_urn:oid:2.49.0.1.840.0.0e9bfaa6e1617f4e03b3f1ce290837256c23dc7e.003.1"] |
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 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.
Calamity.live data shows a weather event with CalamityScore 52/100, near Delaware (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.