Right now
The most recent data we hold from NOAA arrived 33 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 5 July 2026 at 03:30 UTC. It is kept here as a record.
It is the 4th strongest of the 140 detections recorded within 20 km of this point since 19 May 2026. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued July 4 at 8:35PM EDT until July 4 at 11:30PM EDT by NWS Wilmington OH
Urban PEI: 744,757 within a heuristic 50 km radius; not unique people.
Nearby, since 19 May 2026
- July 5, 2026 · score 48 · 1.7 km
- August 8, 2026 · score 48 · 8.0 km
- May 27, 2026 · score 48 · 9.8 km
How we know
9 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 48 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) | 48 / 100 |
| Legacy data-support index | 0.90/1 |
| Coordinates | 39.7225, -84.5863 |
| Nearest City | Trotwood (25 km) |
| Urban exposure index (PEI) | 744.8K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-05T00:35:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.d6aff567c52f3221e8b9cabd7192d31aff1b8eeb.001.1 |
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: 2026-07-05T00:35:00.000Z.
First archived: 2026-07-05T03:05:05.820Z. 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 | Preble, OH |
| Headline | Flash Flood Warning issued July 4 at 8:35PM EDT until July 4 at 11:30PM EDT by NWS Wilmington OH |
| Expires | 2026-07-04T23:30:00-04:00 |
| SenderName | NWS Wilmington OH |
| HasExactCoords | true |
| Iem TypeSummary | D |
| Iem City | 1 SSW North Hampton |
| Iem County | Clark |
| Iem State | OH |
| Iem Wfo | ILN |
| Iem Remark | Small branches down on Sunrise Drive and North Hampton Road. Photo verified. |
| MergedSources | [{"id":"iem_E_39.750_-84.590_1783211400000","source":"iem","severity":"low","severityValue":25,"timestamp":1783211400000,"latitude":39.75,"longitude":-84.59},{"id":"iem_D_40.070_-83.930_1783196520000","source":"iem","severity":"low","severityValue":25,"timestamp":1783196520000,"latitude":40.07,"longitude":-83.93},{"id":"iem_E_39.750_-84.540_1783212840000","source":"iem","severity":"low","severityValue":25,"timestamp":1783212840000,"latitude":39.75,"longitude":-84.54},{"id":"iem_F_39.740_-84.580_1783215900000","source":"iem","severity":"low","severityValue":25,"timestamp":1783215900000,"latitude":39.74,"longitude":-84.58},{"id":"iem_D_39.970_-83.960_1783198800000","source":"iem","severity":"low","severityValue":25,"timestamp":1783198800000,"latitude":39.97,"longitude":-83.96},{"id":"iem_R_39.760_-84.620_1783212300000","source":"iem","severity":"low","severityValue":25,"timestamp":1783212300000,"latitude":39.76,"longitude":-84.62},{"id":"iem_E_39.760_-84.660_1783211460000","source":"iem","severity":"low","severityValue":25,"timestamp":1783211460000,"latitude":39.76,"longitude":-84.66},{"id":"iem_D_39.980_-83.950_1783198800000","source":"iem","severity":"low","severityValue":25,"timestamp":1783198800000,"latitude":39.98,"longitude":-83.95}] |
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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