This alert expired on 27 May 2026 at 22:30 UTC. It is kept here as a record.
It is the 15th strongest of the 75 detections recorded within 20 km of this point since 28 April 2026. Another comparable one was recorded here earlier the same day. 24 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flood Warning issued May 27 at 2:08PM EDT until May 27 at 6:30PM EDT by NWS Wilmington OH
An estimated 800,006 people live within 50 km of this point.
Nearby, since 28 April 2026
- May 19, 2026 · score 48 · 5.0 km
- May 19, 2026 · score 48 · 7.8 km
- August 1, 2026 · score 72 · 8.3 km
How we know
Confirmed by 6 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 | 39.3946, -84.6440 |
| Nearest City | Hamilton (7 km) |
| Population Exposed | 800.0K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-27T18:08:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flood Warning_noaa_urn:oid:2.49.0.1.840.0.f80ca6e126cceff7e8bbc65a994f8458 |
Score Breakdown
Technical Details
| Event | Flood Warning |
| Urgency | Expected |
| Certainty | Likely |
| AreaDesc | Champaign, OH; Clark, OH; Greene, OH; Delaware, IN; Randolph, IN; Clark, OH; Greene, OH; Miami, OH; Montgomery, OH; Preble, OH and 7 more areas |
| Headline | Flood Warning issued May 27 at 2:08PM EDT until May 27 at 6:30PM EDT by NWS Wilmington OH |
| Expires | 2026-05-27T18:30:00-04:00 |
| SenderName | NWS Wilmington OH |
| HasExactCoords | true |
| MergedCount | 12 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.f80ca6e126cceff7e8bbc65a994f8458875b5666.001.1","noaa_urn:oid:2.49.0.1.840.0.8332426c9121c3a3e44792b786e229ccdfeb6298.001.1","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.cc60aa4b6e6571874e7eb23ef170fe8136d2b7aa.005.1","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.b366a44f9ea71908ed9cda8810b40e5a8e63e077.001.1","noaa_urn:oid:2.49.0.1.840.0.b28c57c64c0236dd25315ed034696cce7ddd2fa3.001.1"] |
| Iem TypeSummary | E |
| Iem City | 2 NW Fairborn |
| Iem County | Greene |
| Iem State | OH |
| Iem Wfo | ILN |
| Iem Remark | 6-8 inches of standing water on Medway Road just north of 235. |
| 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},{"id":"iem_E_39.840_-84.040_1779889920000","source":"iem","severity":"low","severityValue":25,"timestamp":1779889920000,"latitude":39.84,"longitude":-84.04}] |
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.
Want to know when something happens near Hamilton?
Calamity.live data shows a weather event with CalamityScore 48/100, near Hamilton (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.