This alert expired on 27 May 2026 at 22:00 UTC. It is kept here as a record.
It is the 9th strongest of the 70 detections recorded within 20 km of this point since 11 March 2026. The last comparable one was on 25 May 2026. 24 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flood Warning issued May 27 at 1:54PM EDT until May 27 at 6:00PM EDT by NWS Wilmington OH
An estimated 764,696 people live within 50 km of this point.
Nearby, since 11 March 2026
- May 25, 2026 · score 48 · 2.7 km
- July 21, 2026 · score 41 · 6.2 km
- August 7, 2026 · score 48 · 6.4 km
How we know
Confirmed by 5 independent sources, including NOAA.
Our own score for this event is 48 out of 100, at 89 % 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 | 89% |
| Coordinates | 39.2472, -84.6793 |
| Nearest City | White Oak (8 km) |
| Population Exposed | 764.7K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-27T17:54:00.000Z |
Score Breakdown
Technical Details
| Event | Flood Warning |
| Urgency | Expected |
| Certainty | Likely |
| AreaDesc | Clark, OH; Greene, OH; Miami, OH; Montgomery, OH; Preble, OH; Lawrence, IN; Martin, IN; Clark, OH and 5 more areas |
| Headline | Flood Warning issued May 27 at 1:54PM EDT until May 27 at 6:00PM EDT by NWS Wilmington OH |
| Expires | 2026-05-27T18:00:00-04:00 |
| SenderName | NWS Wilmington OH |
| HasExactCoords | true |
| MergedCount | 10 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.6e9447bed6cbcd5287fccf3efd9b34c6f6adf2f5.001.1","noaa_urn:oid:2.49.0.1.840.0.cc60aa4b6e6571874e7eb23ef170fe8136d2b7aa.003.1","noaa_urn:oid:2.49.0.1.840.0.cc60aa4b6e6571874e7eb23ef170fe8136d2b7aa.002.1","noaa_urn:oid:2.49.0.1.840.0.cc60aa4b6e6571874e7eb23ef170fe8136d2b7aa.001.1","noaa_urn:oid:2.49.0.1.840.0.0bec3a89550e7a6ee163f1f6295cf019fb831ea3.001.1","noaa_urn:oid:2.49.0.1.840.0.7df455fbc0aa15563468c61867310ea250827be5.001.1","noaa_urn:oid:2.49.0.1.840.0.cc60aa4b6e6571874e7eb23ef170fe8136d2b7aa.004.1","noaa_urn:oid:2.49.0.1.840.0.cc60aa4b6e6571874e7eb23ef170fe8136d2b7aa.005.1","noaa_urn:oid:2.49.0.1.840.0.b366a44f9ea71908ed9cda8810b40e5a8e63e077.001.1","noaa_urn:oid:2.49.0.1.840.0.b28c57c64c0236dd25315ed034696cce7ddd2fa3.001.1"] |
| Iem TypeSummary | E |
| Iem City | 1 SE Clayton |
| Iem County | Montgomery |
| Iem State | OH |
| Iem Wfo | ILN |
| Iem Remark | Kimmel Road closed between Crestway and Wastler due to high water. |
| MergedSources | [{"id":"iem_E_39.870_-84.680_1779897240000","source":"iem","severity":"low","severityValue":25,"timestamp":1779897240000,"latitude":39.87,"longitude":-84.68},{"id":"iem_E_39.780_-84.500_1779897420000","source":"iem","severity":"low","severityValue":25,"timestamp":1779897420000,"latitude":39.78,"longitude":-84.5},{"id":"iem_E_39.830_-84.390_1779889500000","source":"iem","severity":"low","severityValue":25,"timestamp":1779889500000,"latitude":39.83,"longitude":-84.39},{"id":"iem_E_39.850_-84.350_1779897960000","source":"iem","severity":"low","severityValue":25,"timestamp":1779897960000,"latitude":39.85,"longitude":-84.35}] |
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 White Oak (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.