Right now
The most recent data we hold from NOAA arrived 70 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 02:45 UTC. It is kept here as a record.
No stronger detection stands among the 20 recorded within 20 km of this point since 16 March 2026 — 10 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: Severe Thunderstorm Warning issued May 15 at 8:27PM CDT until May 15 at 9:45PM CDT by NWS Sioux Falls SD
Urban PEI: 24,649 within a heuristic 50 km radius; not unique people.
Nearby, since 16 March 2026
- August 9, 2026 · score 34 · 16.7 km
- July 3, 2026 · score 34 · 22.4 km
How we know
7 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 34 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) | 34 / 100 |
| Legacy data-support index | 0.89/1 |
| Coordinates | 42.5793, -94.0977 |
| Nearest City | Fort Dodge (11 km) |
| Urban exposure index (PEI) | 24.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-16T01:27:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.daa03bd27329dcbd73df8d5a8b121807 |
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: 2026-05-16T01:27:00.000Z.
First archived: 2026-05-16T01:29:32.031Z. 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 | Buena Vista, IA; Cherokee, IA; Hancock, IA; Kossuth, IA; Winnebago, IA; Buena Vista, IA; Clay, IA and 8 more areas |
| Headline | Severe Thunderstorm Warning issued May 15 at 8:27PM CDT until May 15 at 9:45PM CDT by NWS Sioux Falls SD |
| Expires | 2026-05-15T21:45:00-05:00 |
| SenderName | NWS Sioux Falls SD |
| HasExactCoords | true |
| MergedCount | 12 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.daa03bd27329dcbd73df8d5a8b1218074c013358.001.1","noaa_urn:oid:2.49.0.1.840.0.f633c1160233a556aa504aa6aaa010d4a63c36aa.001.1","noaa_urn:oid:2.49.0.1.840.0.2debd07a0eaaf94c331ab4fe72ba8d4a3e76c94d.002.1","noaa_urn:oid:2.49.0.1.840.0.ba8048c6f5ec1d817aeb042d234c25a4664f82fb.001.1","noaa_urn:oid:2.49.0.1.840.0.c8ebff844dcd17495b61671987c3fa90e561befe.001.1","noaa_urn:oid:2.49.0.1.840.0.8c1231ad7bceaeaae992599a5faac5c701e8b7c9.001.1","noaa_urn:oid:2.49.0.1.840.0.2ca0686b42f230fceacfcde6e849aee3e4c9fe19.002.1","noaa_urn:oid:2.49.0.1.840.0.93e018f89595ae4253f7c4d201cce7c058ad424d.001.1","noaa_urn:oid:2.49.0.1.840.0.c87f691d7556ace571758a4719b1480c72d6c06c.001.1","noaa_urn:oid:2.49.0.1.840.0.282777f2a720edd018ac961a7200520728933155.002.1","noaa_urn:oid:2.49.0.1.840.0.e8a6aca2884f73abb49ef26400f0dcbea41c89e0.001.1","noaa_urn:oid:2.49.0.1.840.0.7eaef2840cbac6893f9a7310cd68cf05f995acee.002.1"] |
| Iem TypeSummary | H |
| Iem Magnitude | 1 |
| Iem Unit | Inch |
| Iem City | 2 WNW Meservey |
| Iem County | Hancock |
| Iem State | IA |
| Iem Wfo | DMX |
| MergedSources | [{"id":"iem_H_43.190_-93.910_1778891640000","source":"iem","severity":"low","severityValue":25,"timestamp":1778891640000,"latitude":43.19,"longitude":-93.91},{"id":"iem_H_42.740_-94.680_1778890860000","source":"iem","severity":"low","severityValue":25,"timestamp":1778890860000,"latitude":42.74,"longitude":-94.68},{"id":"iem_H_42.930_-93.790_1778890920000","source":"iem","severity":"low","severityValue":25,"timestamp":1778890920000,"latitude":42.93,"longitude":-93.79},{"id":"iem_H_43.230_-93.910_1778889480000","source":"iem","severity":"low","severityValue":25,"timestamp":1778889480000,"latitude":43.23,"longitude":-93.91},{"id":"iem_H_42.600_-95.000_1778888580000","source":"iem","severity":"low","severityValue":25,"timestamp":1778888580000,"latitude":42.6,"longitude":-95},{"id":"iem_H_42.920_-93.500_1778893380000","source":"iem","severity":"low","severityValue":25,"timestamp":1778893380000,"latitude":42.92,"longitude":-93.5}] |
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.
Review the area, threshold and delivery channel in your account.
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