Right now
The most recent data we hold from NOAA arrived 4 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 19 May 2026 at 03:00 UTC. It is kept here as a record.
No stronger detection stands among the 111 recorded within 20 km of this point since 15 March 2026 — 30 others scored the same. Another comparable one was recorded here earlier the same day. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Tornado Watch issued May 18 at 6:48PM CDT until May 18 at 10:00PM CDT by NWS Kansas City/Pleasant Hill MO
Urban PEI: 42,595 within a heuristic 50 km radius; not unique people.
Nearby, since 15 March 2026
- September 14, 2026 · score 46 · 0.0 km
- August 1, 2026 · score 46 · 0.0 km
- July 21, 2026 · score 28 · 0.0 km
How we know
3 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 | High |
| Calamity Score (ours) | 46 / 100 |
| Legacy data-support index | 0.91/1 |
| Coordinates | 38.5000, -92.3000 |
| Nearest City | Jefferson City (14 km) |
| Urban exposure index (PEI) | 42.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-18T23:48:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.5e1bca56c31313c9ce5b6229a4a23b3695e9a15e.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: 2026-05-18T23:48:00.000Z.
First archived: 2026-05-19T02:43:45.057Z. 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 Watch |
| Urgency | Future |
| Certainty | Possible |
| AreaDesc | Grundy, MO; Mercer, MO |
| Headline | Tornado Watch issued May 18 at 6:48PM CDT until May 18 at 10:00PM CDT by NWS Kansas City/Pleasant Hill MO |
| Expires | 2026-05-18T22:00:00-05:00 |
| SenderName | NWS Kansas City/Pleasant Hill MO |
| HasExactCoords | false |
| Iem TypeSummary | R |
| Iem Magnitude | 1.64 |
| Iem Unit | Inch |
| Iem City | 1 SW Holts Summit |
| Iem County | Callaway |
| Iem State | MO |
| Iem Wfo | LSX |
| Iem Remark | South side of Holts Summit. |
| MergedSources | [{"id":"iem_R_38.930_-92.400_1779134400000","source":"iem","severity":"low","severityValue":25,"timestamp":1779134400000,"latitude":38.93,"longitude":-92.4},{"id":"iem_R_38.630_-92.130_1779135300000","source":"iem","severity":"low","severityValue":25,"timestamp":1779135300000,"latitude":38.63,"longitude":-92.13}] |
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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