Right now
The most recent data we hold from NOAA arrived 10 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 23:30 UTC. It is kept here as a record.
It is the 11th strongest of the 40 detections recorded within 20 km of this point since 15 March 2026. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 18 at 5:34PM CDT until May 18 at 6:30PM CDT by NWS Des Moines IA
Urban PEI: 80,929 within a heuristic 50 km radius; not unique people.
Nearby, since 15 March 2026
- June 5, 2026 · score 39 · 2.7 km
- June 4, 2026 · score 63 · 4.8 km
- May 15, 2026 · score 39 · 12.7 km
How we know
9 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 39 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) | 39 / 100 |
| Legacy data-support index | 0.89/1 |
| Coordinates | 39.3794, -96.7851 |
| Nearest City | Manhattan (29 km) |
| Urban exposure index (PEI) | 80.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-18T22:34:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.c72ff4f80da9418f3492446d868ef891 |
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: 2026-05-18T22:34:00.000Z.
First archived: 2026-05-18T22:36:37.324Z. 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 | Adams, IA; Taylor, IA; Atchison, MO; Atchison, MO; Holt, MO; Nodaway, MO and 9 more areas |
| Headline | Severe Thunderstorm Warning issued May 18 at 5:34PM CDT until May 18 at 6:30PM CDT by NWS Des Moines IA |
| Expires | 2026-05-18T18:30:00-05:00 |
| SenderName | NWS Des Moines IA |
| HasExactCoords | true |
| MergedCount | 12 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.c72ff4f80da9418f3492446d868ef8917ab60ce4.001.1","noaa_urn:oid:2.49.0.1.840.0.305a0979aa239e53b2331faf9c7f6be2d2f8234d.001.1","noaa_urn:oid:2.49.0.1.840.0.4008fcabc47e1391fb5dba8a96736940a2bf16fc.001.1","noaa_urn:oid:2.49.0.1.840.0.b17c69384d938483ca40c20400b4fed23c838f6b.001.1","noaa_urn:oid:2.49.0.1.840.0.340f10b2d3cb17124408f8a3ee051820ad8140f7.001.1","noaa_urn:oid:2.49.0.1.840.0.69b2baa8bf8275542aca1abb7b6953b19d23892c.001.1","noaa_urn:oid:2.49.0.1.840.0.0ec4ce4de0466e8ed28d59f4d71da9f1b0281453.001.1","noaa_urn:oid:2.49.0.1.840.0.a0c74b8880cecfd835f4558b84c3805169ab3e06.001.1","noaa_urn:oid:2.49.0.1.840.0.b0b808ef552e7ce9ddd937e254d755903bc06c2f.001.1","noaa_urn:oid:2.49.0.1.840.0.c6be5226c2f51c8c4d58d5f38a039623dd90e801.001.1","noaa_urn:oid:2.49.0.1.840.0.fd6fcc3ba650c117e244fdd7c3a0b47254af93b0.001.1","noaa_urn:oid:2.49.0.1.840.0.d3b01c5848f2cb90c4fee460e2a87bb5c68f0862.002.1"] |
| Iem TypeSummary | H |
| Iem Magnitude | 1 |
| Iem Unit | Inch |
| Iem City | 5 SSE Wells |
| Iem County | Ottawa |
| Iem State | KS |
| Iem Wfo | TOP |
| MergedSources | [{"id":"iem_T_39.600_-97.110_1779138180000","source":"iem","severity":"low","severityValue":25,"timestamp":1779138180000,"latitude":39.6,"longitude":-97.11},{"id":"iem_H_39.360_-97.430_1779137100000","source":"iem","severity":"low","severityValue":25,"timestamp":1779137100000,"latitude":39.36,"longitude":-97.43},{"id":"iem_H_39.470_-97.160_1779139680000","source":"iem","severity":"low","severityValue":25,"timestamp":1779139680000,"latitude":39.47,"longitude":-97.16},{"id":"iem_H_39.350_-97.450_1779137400000","source":"iem","severity":"low","severityValue":25,"timestamp":1779137400000,"latitude":39.35,"longitude":-97.45},{"id":"iem_T_39.610_-97.140_1779138240000","source":"iem","severity":"low","severityValue":25,"timestamp":1779138240000,"latitude":39.61,"longitude":-97.14},{"id":"iem_H_38.920_-97.340_1779140580000","source":"iem","severity":"low","severityValue":25,"timestamp":1779140580000,"latitude":38.92,"longitude":-97.34},{"id":"iem_H_39.500_-97.130_1779139800000","source":"iem","severity":"low","severityValue":25,"timestamp":1779139800000,"latitude":39.5,"longitude":-97.13},{"id":"iem_H_39.070_-97.520_1779139920000","source":"iem","severity":"low","severityValue":25,"timestamp":1779139920000,"latitude":39.07,"longitude":-97.52}] |
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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