Right now
The most recent data we hold from NOAA arrived 2 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 16 May 2026 at 04:15 UTC. It is kept here as a record.
It is the 12th strongest of the 34 detections recorded within 20 km of this point since 16 March 2026. 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: Severe Thunderstorm Warning issued May 15 at 10:42PM CDT until May 15 at 11:15PM CDT by NWS La Crosse WI
Nearby, since 16 March 2026
- July 2, 2026 · score 67 · 12.2 km
- July 11, 2026 · score 22 · 16.0 km
- May 16, 2026 · score 22 · 20.1 km
How we know
3 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 22 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 | Medium |
| Calamity Score (ours) | 22 / 100 |
| Legacy data-support index | 0.70/1 |
| Coordinates | 42.7856, -91.8137 |
| Nearest City | Waterloo (54 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-05-16T03:42:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.9ae19833103bb225a6af00a688a013a8 |
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: 2026-05-16T03:42:00.000Z.
First archived: 2026-05-16T03:48:27.045Z. 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 | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Allamakee, IA; Clayton, IA; Buchanan, IA; Fayette, IA and 1 more areas |
| Headline | Severe Thunderstorm Warning issued May 15 at 10:42PM CDT until May 15 at 11:15PM CDT by NWS La Crosse WI |
| Expires | 2026-05-15T23:15:00-05:00 |
| SenderName | NWS La Crosse WI |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.9ae19833103bb225a6af00a688a013a85ba522d2.002.1","noaa_urn:oid:2.49.0.1.840.0.1e9601670298ec33ab8b7b3b5641deb749908137.001.1","noaa_urn:oid:2.49.0.1.840.0.e0c964909b412b637faa8be7810c24c72ff702b3.001.1","noaa_urn:oid:2.49.0.1.840.0.09306b794d4c2484a11a8368ba5e127c7d34d86f.002.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 43 |
| Iem Unit | MPH |
| Iem City | 2 N Ionia |
| Iem County | Chickasaw |
| Iem State | IA |
| Iem Wfo | ARX |
| Iem Remark | Mesonet station RNHI4 New Hampton. |
| MergedSources | [{"id":"iem_G_43.070_-92.620_1778897700000","source":"iem","severity":"low","severityValue":25,"timestamp":1778897700000,"latitude":43.07,"longitude":-92.62},{"id":"iem_G_43.070_-92.460_1778898600000","source":"iem","severity":"low","severityValue":25,"timestamp":1778898600000,"latitude":43.07,"longitude":-92.46}] |
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.
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