This alert expired on 11 August 2026 at 09:15 UTC. It is kept here as a record.
It is the 5th strongest of the 32 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 August 11 at 4:28AM EDT until August 11 at 5:15AM EDT by NWS Cleveland OH
An estimated 117,846 people live within 50 km of this point.
Nearby, since 16 March 2026
- August 11, 2026 · score 43 · 11.6 km
- June 18, 2026 · score 67 · 13.1 km
- June 18, 2026 · score 67 · 16.2 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 81 % 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) | 43 / 100 |
| Our confidence | 81% |
| Coordinates | 41.8501, -80.3780 |
| Nearest City | Ashtabula (34 km) |
| Population Exposed | 117.8K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-11T08:28:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.9baeb0fa5231681f0bbea0f3e23b247d |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Crawford, PA; Erie, PA; Ashtabula, OH; Crawford, PA; Erie, PA |
| Headline | Severe Thunderstorm Warning issued August 11 at 4:28AM EDT until August 11 at 5:15AM EDT by NWS Cleveland OH |
| Expires | 2026-08-11T05:15:00-04:00 |
| SenderName | NWS Cleveland OH |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.9baeb0fa5231681f0bbea0f3e23b247dfd861a52.001.1","noaa_urn:oid:2.49.0.1.840.0.9da1ec378841b48c75dd7c66341893fb1051c918.001.1"] |
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 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 Ashtabula?
Calamity.live data shows a weather event with CalamityScore 43/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 187 scientific monitoring sources.