This alert expired on 17 May 2026 at 05:48 UTC. It is kept here as a record.
No stronger detection stands among the 46 recorded within 20 km of this point since 15 March 2026 — 8 others scored the same. 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: Tornado Warning issued May 17 at 12:39AM CDT until May 17 at 12:45AM CDT by NWS Topeka KS
Nearby, since 15 March 2026
- July 31, 2026 · score 22 · 18.0 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 46 out of 100, at 70 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | critical |
| Calamity Score (ours) | 46 / 100 |
| Our confidence | 70% |
| Coordinates | 39.7680, -96.2920 |
| Nearest City | Manhattan (70 km) |
| Impact Tier | minor |
| Timestamp | 2026-05-17T05:39:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.3ced66df427c3c7881dfc132ea448d1362480a2a.001.1 |
Score Breakdown
Technical Details
| Event | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Marshall, KS; Nemaha, KS |
| Headline | Tornado Warning issued May 17 at 12:39AM CDT until May 17 at 12:45AM CDT by NWS Topeka KS |
| Expires | 2026-05-17T00:48:00-05:00 |
| SenderName | NWS Topeka KS |
| HasExactCoords | true |
| Iem TypeSummary | G |
| Iem Magnitude | 70 |
| Iem Unit | MPH |
| Iem City | Waterville |
| Iem County | Marshall |
| Iem State | KS |
| Iem Wfo | TOP |
| Iem Remark | Estimated 60 to 80 mph wind gusts in Waterville. |
| MergedSources | [{"id":"iem_G_40.050_-96.910_1778994840000","source":"iem","severity":"low","severityValue":25,"timestamp":1778994840000,"latitude":40.05,"longitude":-96.91},{"id":"iem_G_39.690_-96.750_1778994360000","source":"iem","severity":"low","severityValue":25,"timestamp":1778994360000,"latitude":39.69,"longitude":-96.75}] |
Safety Information
If a tornado warning is issued: go to a basement or an interior room on the lowest floor, away from windows. A vehicle and a mobile home are not shelter. Cover your head and neck. Wait for the official all-clear before going outside, and watch for downed power lines and gas leaks afterwards.
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 46/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.