Right now
The most recent data we hold from NOAA arrived 6 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 18 May 2026 at 04:15 UTC. It is kept here as a record.
It is the 15th strongest of the 52 detections recorded within 20 km of this point since 16 March 2026. Another comparable one was recorded here earlier the same day. 17 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 17 at 10:19PM CDT until May 17 at 11:15PM CDT by NWS Kansas City/Pleasant Hill MO
Nearby, since 16 March 2026
- June 13, 2026 · score 48 · 17.7 km
How we know
Confirmed by 7 independent sources, including NOAA.
Our own score for this event is 22 out of 100, at 70 % 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 | Medium |
| Calamity Score (ours) | 22 / 100 |
| Our confidence | 70% |
| Coordinates | 41.0675, -95.2100 |
| Nearest City | Bellevue (58 km) |
| Impact Tier | minor |
| Timestamp | 2026-05-18T03:19:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.e804ce9784bb8cdeb4079dd51f3e3dc4 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Atchison, MO; Holt, MO; Nodaway, MO; Marshall, KS; Nemaha, KS; Ottawa, KS and 11 more areas |
| Headline | Severe Thunderstorm Warning issued May 17 at 10:19PM CDT until May 17 at 11:15PM CDT by NWS Kansas City/Pleasant Hill MO |
| Expires | 2026-05-17T23:15:00-05:00 |
| SenderName | NWS Kansas City/Pleasant Hill MO |
| HasExactCoords | true |
| MergedCount | 14 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.e804ce9784bb8cdeb4079dd51f3e3dc443b910d7.001.1","noaa_urn:oid:2.49.0.1.840.0.5b0ca8fb9e7334ac764c7fc2872daaae1ef00ac3.001.1","noaa_urn:oid:2.49.0.1.840.0.ecbf4a07bdd82a85be8caedf7b8863b6437055c3.001.1","noaa_urn:oid:2.49.0.1.840.0.41be877d8d5faea0cbd72ed909174a15dbe81d4a.001.1","noaa_urn:oid:2.49.0.1.840.0.5aaa6b209d4c0921598ab45005f050fe031c1d40.001.1","noaa_urn:oid:2.49.0.1.840.0.3eafa387723082b2f3da3e80ca04e0e8ec136385.001.1","noaa_urn:oid:2.49.0.1.840.0.351446278ae473aa6cf392b91c2793c26e25584a.001.1","noaa_urn:oid:2.49.0.1.840.0.d75f1ba65db0b047a4c497c852286601ac5d32dc.001.1","noaa_urn:oid:2.49.0.1.840.0.325b6af3fdeacc1d2df700d6816c6cebb48155f7.002.1","noaa_urn:oid:2.49.0.1.840.0.a9fb932ad6386f373c020a9ace8947f2012aa64c.001.1","noaa_urn:oid:2.49.0.1.840.0.5221c41e2f2967172e76ff0ff40f51b0e289cb53.001.1","noaa_urn:oid:2.49.0.1.840.0.1130de6920d9aa7ff1fb68a492ec1aa644c2e9a7.001.1","noaa_urn:oid:2.49.0.1.840.0.89880e7f66fc29f7fbafdb27187dce466b295f69.001.1","noaa_urn:oid:2.49.0.1.840.0.e9d48d09809fe2890cd9ca92421e7de6591cf230.002.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 72 |
| Iem Unit | MPH |
| Iem City | 5 ESE Henderson |
| Iem County | Montgomery |
| Iem State | IA |
| Iem Wfo | OAX |
| Iem Remark | Personal Weather Station. |
| MergedSources | [{"id":"iem_G_41.300_-95.410_1779070560000","source":"iem","severity":"low","severityValue":25,"timestamp":1779070560000,"latitude":41.3,"longitude":-95.41},{"id":"iem_G_41.300_-95.890_1779067620000","source":"iem","severity":"low","severityValue":25,"timestamp":1779067620000,"latitude":41.3,"longitude":-95.89},{"id":"iem_G_41.130_-96.060_1779068520000","source":"iem","severity":"low","severityValue":25,"timestamp":1779068520000,"latitude":41.13,"longitude":-96.06},{"id":"iem_G_41.180_-96.040_1779068220000","source":"iem","severity":"low","severityValue":25,"timestamp":1779068220000,"latitude":41.18,"longitude":-96.04},{"id":"iem_T_40.990_-95.900_1779068760000","source":"iem","severity":"low","severityValue":25,"timestamp":1779068760000,"latitude":40.99,"longitude":-95.9},{"id":"iem_G_41.120_-95.350_1779070740000","source":"iem","severity":"low","severityValue":25,"timestamp":1779070740000,"latitude":41.12,"longitude":-95.35}] |
Safety Information
Always follow official guidance from your local emergency management agency. This platform provides scientific monitoring data and is not a substitute for official warnings. If you are in immediate danger, contact your local emergency number.
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.
Want to know when something happens in this area?
Calamity.live data shows a weather event with CalamityScore 22/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.