Right now
The most recent data we hold from NOAA arrived 3 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 21 July 2026 at 22:30 UTC. It is kept here as a record.
It is the 36th strongest of the 184 detections recorded within 20 km of this point since 11 March 2026. The last comparable one was on 11 July 2026. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued July 21 at 3:37PM EDT until July 21 at 6:30PM EDT by NWS Wilmington OH
Urban PEI: 64,810 within a heuristic 50 km radius; not unique people.
Nearby, since 11 March 2026
- September 5, 2026 · score 32 · 12.3 km
- July 21, 2026 · score 32 · 12.8 km
- March 11, 2026 · score 39 · 13.6 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 32 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) | 32 / 100 |
| Legacy data-support index | 0.79/1 |
| Coordinates | 39.4459, -82.3241 |
| Nearest City | Athens (23 km) |
| Urban exposure index (PEI) | 64.8K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-21T19:37:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.13cc56e82b128f821a98b9b3c1c5f46e |
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: 2026-07-21T19:37:00.000Z.
First archived: 2026-07-21T19:49:47.494Z. 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 | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Brown, OH; Clermont, OH; Hamilton, OH; Perry, OH; Dearborn, IN; Ripley, IN and 8 more areas |
| Headline | Flash Flood Warning issued July 21 at 3:37PM EDT until July 21 at 6:30PM EDT by NWS Wilmington OH |
| Expires | 2026-07-21T18:30:00-04:00 |
| SenderName | NWS Wilmington OH |
| HasExactCoords | true |
| MergedCount | 11 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.13cc56e82b128f821a98b9b3c1c5f46e5805820a.001.1","noaa_urn:oid:2.49.0.1.840.0.2dc8ac58896f23e88e92f3acb9a1c77bc398f055.001.1","noaa_urn:oid:2.49.0.1.840.0.e6adb43ef6e3ff7a23b02a63d275df732405a626.001.1","noaa_urn:oid:2.49.0.1.840.0.4c1a0a626d1b4eca56e6f0a07eac25572f59e833.001.1","noaa_urn:oid:2.49.0.1.840.0.f95988129381e5167a498f952b34befeccb3080f.001.1","noaa_urn:oid:2.49.0.1.840.0.ae9aa3e8a2fb7f3f2ca018f6ac8faf7e94867763.001.1","noaa_urn:oid:2.49.0.1.840.0.da1b75e955dab550a45448c62b41a7d5c8197581.001.1","noaa_urn:oid:2.49.0.1.840.0.5a551158688956705c21ebb2a192924fc5774f61.001.1","noaa_urn:oid:2.49.0.1.840.0.5df93be14fe24952fda9a22fa21180c2a92e6656.001.1","noaa_urn:oid:2.49.0.1.840.0.7b4605eb4063042b8e07d4d872ac99fd3044761d.001.1","noaa_urn:oid:2.49.0.1.840.0.d4597b6905f4a0d8362648f0a503c4164326f464.001.1"] |
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 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.
Review the area, threshold and delivery channel in your account.
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