Right now
The most recent data we hold from NOAA arrived 12 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
One other detection within 20 km in the last 24 hours, 10 km from here.
This alert expired on 1 June 2026 at 07:30 UTC. It is kept here as a record.
It is the 7th strongest of the 74 detections recorded within 20 km of this point since 15 March 2026. Another comparable one was recorded here earlier the same day. 31 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued May 31 at 11:40PM CDT until June 1 at 2:30AM CDT by NWS Topeka KS
An estimated 24,649 people live within 50 km of this point.
Nearby, since 15 March 2026
- June 1, 2026 · score 58 · 13.1 km
- July 4, 2026 · score 34 · 14.9 km
- June 17, 2026 · score 28 · 16.5 km
How we know
Confirmed by 15 independent sources, including NOAA.
Our own score for this event is 40 out of 100, at 89 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
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 | High |
| Calamity Score (ours) | 40 / 100 |
| Our confidence | 89% |
| Coordinates | 38.1874, -95.9617 |
| Nearest City | Emporia (30 km) |
| Population Exposed | 24.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-01T04:40:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.6775b6618e9b6855892bbf1b75d8cfc3 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Coffey, KS; Lyon, KS |
| Headline | Flash Flood Warning issued May 31 at 11:40PM CDT until June 1 at 2:30AM CDT by NWS Topeka KS |
| Expires | 2026-06-01T02:30:00-05:00 |
| SenderName | NWS Topeka KS |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.6775b6618e9b6855892bbf1b75d8cfc39ab8002b.001.1","noaa_urn:oid:2.49.0.1.840.0.d444fc02794066fe93a3f874c9f7b1fccd686d25.001.1"] |
| Spc ReportType | hail |
| Spc Speed | 100 |
| Spc Location | 5 WSW Emporia |
| Spc County | Lyon |
| Spc State | KS |
| Spc Comments | Spotter network report. (TOP) |
| Iem TypeSummary | H |
| Iem Magnitude | 2.5 |
| Iem Unit | Inch |
| Iem City | Gridley |
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.
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