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.
No stronger detection stands among the 5 recorded within 20 km of this point since 18 May 2026 — 2 others scored the same.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 17 at 10:35PM CDT until May 17 at 11:15PM CDT by NWS La Crosse WI
An estimated 89,709 people live within 50 km of this point.
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 39 out of 100, at 91 % 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) | 39 / 100 |
| Our confidence | 91% |
| Coordinates | 42.1159, -94.0263 |
| Nearest City | Ames (35 km) |
| Population Exposed | 89.7K within 50 km |
| Impact Tier | significant |
| Date | 2026-05-18 — time not reported by the source |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.f1af1734a4735db4f286ec7f02fcb045 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Mower, MN; Freeborn, MN; Floyd, IA; Mitchell, IA; Mower, MN and 7 more areas |
| Headline | Severe Thunderstorm Warning issued May 17 at 10:35PM CDT until May 17 at 11:15PM CDT by NWS La Crosse WI |
| Expires | 2026-05-17T23:15:00-05:00 |
| SenderName | NWS La Crosse WI |
| HasExactCoords | true |
| MergedCount | 10 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.f1af1734a4735db4f286ec7f02fcb045bc84660e.001.1","noaa_urn:oid:2.49.0.1.840.0.2dad2c8658977db531b327c064c9195bf2508f09.001.1","noaa_urn:oid:2.49.0.1.840.0.68b69cdd2a731255ce4ac1d3fd55dde292eccba9.001.1","noaa_urn:oid:2.49.0.1.840.0.1130de6920d9aa7ff1fb68a492ec1aa644c2e9a7.001.1","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:2.49.0.1.840.0.385c4545ec2fb4a0a46140cdf272cd33a5de0014.002.1","noaa_urn:oid:2.49.0.1.840.0.f348b76b3ece7570d78ab5e6ec982f68737f6982.001.1","noaa_urn:oid:2.49.0.1.840.0.e804ce9784bb8cdeb4079dd51f3e3dc443b910d7.001.1"] |
| Iem TypeSummary | T |
| Iem City | Pomeroy |
| Iem County | Calhoun |
| Iem State | IA |
| Iem Wfo | DMX |
| Iem Remark | Local Fire department reports tornado. |
| MergedSources | [{"id":"iem_D_42.450_-94.260_1779071640000","source":"iem","severity":"low","severityValue":25,"timestamp":1779071640000,"latitude":42.45,"longitude":-94.26},{"id":"iem_T_42.550_-94.680_1779069660000","source":"iem","severity":"low","severityValue":25,"timestamp":1779069660000,"latitude":42.55,"longitude":-94.68}] |
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 39/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.