Right now
The most recent data we hold from NOAA arrived 4 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 18 July 2026 at 22:00 UTC. It is kept here as a record.
It is the 32nd strongest of the 62 detections recorded within 20 km of this point since 31 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 July 18 at 5:20PM EDT until July 18 at 6:00PM EDT by NWS Cleveland OH
Nearby, since 31 March 2026
- August 8, 2026 · score 22 · 7.3 km
- June 20, 2026 · score 22 · 12.9 km
- June 21, 2026 · score 22 · 13.0 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 22 out of 100.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
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) | 22 / 100 |
| Legacy data-support index | 0.59/1 |
| Coordinates | 41.5773, -79.1391 |
| Nearest City | Jamestown (59 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-07-18T21:20:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.8670d83cd21cb32c7afca58a5157624f |
Physical priority index · v1. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: noaa. Occurrence: 2026-07-18T21:20:00.000Z.
First archived: 2026-07-18T21:25:15.087Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Summit, OH; Trumbull, OH; Clarion, PA and 9 more areas |
| Headline | Severe Thunderstorm Warning issued July 18 at 5:20PM EDT until July 18 at 6:00PM EDT by NWS Cleveland OH |
| Expires | 2026-07-18T18:00:00-04:00 |
| SenderName | NWS Cleveland OH |
| HasExactCoords | true |
| MergedCount | 12 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.8670d83cd21cb32c7afca58a5157624f6f3dd9b2.001.1","noaa_urn:oid:2.49.0.1.840.0.4d7581d1a41dee84df285b304f8ce88996f7ef33.001.1","noaa_urn:oid:2.49.0.1.840.0.16804442fe5b71af7de323d1ff1413331367fddc.001.1","noaa_urn:oid:2.49.0.1.840.0.ae0516a61ee5ca94cfcd1c86043dff21ad8822dc.001.1","noaa_urn:oid:2.49.0.1.840.0.cd36232a5f9ade5f0992a10ccc8c2eac289e98c2.001.1","noaa_urn:oid:2.49.0.1.840.0.6df1a7df23c0138e499ee88b9f2bfc12d761b169.001.1","noaa_urn:oid:2.49.0.1.840.0.d6addc8aed72796e53f2fcb7a003a8c52de2149c.001.1","noaa_urn:oid:2.49.0.1.840.0.8c0e22efb0bf3e9ef814e7a38e4ecebf1c5df853.001.1","noaa_urn:oid:2.49.0.1.840.0.c0d9bb7ff68b5ed477af93b3ba1b4587a337fee6.001.1","noaa_urn:oid:2.49.0.1.840.0.4d74b174a8a25b6ec39f9fc382dce8d3c6eca2f7.001.1","noaa_urn:oid:2.49.0.1.840.0.edaa375bc1c24c9d35b8589a1835aac07e796b26.001.1","noaa_urn:oid:2.49.0.1.840.0.b08ae767421e5836e650c556164a2cd883b6b63f.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.
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