This alert expired on 18 July 2026 at 00:30 UTC. It is kept here as a record.
It is the 11th strongest of the 69 detections recorded within 20 km of this point since 15 March 2026. Another comparable one was recorded here earlier the same day. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued July 17 at 6:11PM EDT until July 17 at 8:30PM EDT by NWS Wilmington OH
An estimated 780,839 people live within 50 km of this point.
Nearby, since 15 March 2026
- July 18, 2026 · score 48 · 7.3 km
- May 25, 2026 · score 48 · 9.5 km
- June 18, 2026 · score 72 · 10.0 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 48 out of 100, at 80 % 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) | 48 / 100 |
| Our confidence | 80% |
| Coordinates | 39.1960, -84.3225 |
| Nearest City | Norwood (13 km) |
| Population Exposed | 780.8K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-17T22:11:00.000Z |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Hamilton, OH; Clermont, OH; Hamilton, OH; Clermont, OH; Hamilton, OH; Warren, OH |
| Headline | Flash Flood Warning issued July 17 at 6:11PM EDT until July 17 at 8:30PM EDT by NWS Wilmington OH |
| Expires | 2026-07-17T20:30:00-04:00 |
| SenderName | NWS Wilmington OH |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.cd4d71e8125ccd77cf0e591527e7bed34b52ebd9.001.1","noaa_urn:oid:2.49.0.1.840.0.14d57513653897e703079c4cc224dcc46661d36c.001.1","noaa_urn:oid:2.49.0.1.840.0.1aeb203009c70c404de2788023a7e86a25ef30ee.001.1"] |
Safety Information
During flooding: never walk, swim, or drive through floodwaters. Six inches of moving water can knock you down, and one foot of water can sweep away a vehicle. Move to higher ground if waters rise. After flooding, avoid contact with floodwater which may contain sewage, chemicals, or debris. Follow local emergency service guidance.
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 48/100, near Norwood (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.