Right now
The most recent data we hold from NOAA arrived 3 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 17 May 2026 at 05:45 UTC. It is kept here as a record.
No stronger detection stands among the 45 recorded within 20 km of this point since 15 March 2026 — 8 others scored the same. The last comparable one was on 23 April 2026.
What the source measured
NOAA reported: Tornado Warning issued May 17 at 12:26AM CDT until May 17 at 12:45AM CDT by NWS Topeka KS
Nearby, since 15 March 2026
- May 17, 2026 · score 46 · 4.6 km
How we know
2 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 46 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 | Critical |
| Calamity Score (ours) | 46 / 100 |
| Legacy data-support index | 0.65/1 |
| Coordinates | 39.7680, -96.3460 |
| Nearest City | Manhattan (68 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-05-17T05:26:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.715cc605d236389dc848b8435c4f1719d821071c.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: 2026-05-17T05:26:00.000Z.
First archived: 2026-05-17T05:34:11.820Z. 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 | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Marshall, KS; Nemaha, KS |
| Headline | Tornado Warning issued May 17 at 12:26AM CDT until May 17 at 12:45AM CDT by NWS Topeka KS |
| Expires | 2026-05-17T00:45:00-05:00 |
| 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_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 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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