Right now
The most recent data we hold from NOAA arrived 31 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 23:00 UTC. It is kept here as a record.
It is the 6th strongest of the 53 detections recorded within 20 km of this point since 16 May 2026. Another comparable one was recorded here earlier the same day. 8 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 16 at 5:31PM CDT until May 16 at 6:00PM CDT by NWS Omaha/Valley NE
Nearby, since 16 May 2026
- May 16, 2026 · score 46 · 10.8 km
- September 7, 2026 · score 28 · 17.4 km
How we know
4 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 | 0.69/1 |
| Coordinates | 40.6280, -94.3831 |
| Nearest City | Saint Joseph (103 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-05-16T22:31:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.4176d039f33ec1de63646562b5e19817 |
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: 2026-05-16T22:31:00.000Z.
First archived: 2026-05-16T22:33:35.041Z. 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 | Montgomery, IA; Grundy, MO; Mercer, MO; Sullivan, MO; Grundy, MO; Linn, MO; Sullivan, MO and 3 more areas |
| Headline | Severe Thunderstorm Warning issued May 16 at 5:31PM CDT until May 16 at 6:00PM CDT by NWS Omaha/Valley NE |
| Expires | 2026-05-16T18:00:00-05:00 |
| SenderName | NWS Omaha/Valley NE |
| HasExactCoords | true |
| MergedCount | 7 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.4176d039f33ec1de63646562b5e1981799f5e295.001.1","noaa_urn:oid:2.49.0.1.840.0.b76b5b893df3a6778ab379bc6c8fd8f88179eeaf.001.1","noaa_urn:oid:2.49.0.1.840.0.a8bf03389ab0c6c23ccb94c423c1b9c1b2a4c7f0.001.1","noaa_urn:oid:2.49.0.1.840.0.988ff8a96e86af4749e019dc623358490bae946f.001.1","noaa_urn:oid:2.49.0.1.840.0.a915e9349a9142b559811b38a38ee7fb1c22f75f.001.1","noaa_urn:oid:2.49.0.1.840.0.a66bc0e6c9d1cbb1133119f1b3ab5d0874322ff1.001.1","noaa_urn:oid:2.49.0.1.840.0.71bd3f464d411dc3730a865c58ee630a46e7c9c7.001.1"] |
| Iem TypeSummary | H |
| Iem Magnitude | 1 |
| Iem Unit | Inch |
| Iem City | Stanton |
| Iem County | Montgomery |
| Iem State | IA |
| Iem Wfo | OAX |
| Iem Remark | Member of the public reported hail up to the size of quarters. |
| MergedSources | [{"id":"iem_H_40.940_-95.100_1778967180000","source":"iem","severity":"low","severityValue":25,"timestamp":1778967180000,"latitude":40.94,"longitude":-95.1},{"id":"iem_H_40.800_-94.890_1778969400000","source":"iem","severity":"low","severityValue":25,"timestamp":1778969400000,"latitude":40.8,"longitude":-94.89},{"id":"iem_H_40.980_-95.100_1778968260000","source":"iem","severity":"low","severityValue":25,"timestamp":1778968260000,"latitude":40.98,"longitude":-95.1}] |
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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