This alert expired on 31 July 2026 at 07:00 UTC. It is kept here as a record.
It is the 4th strongest of the 45 detections recorded within 20 km of this point since 15 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 July 31 at 1:20AM CDT until July 31 at 2:00AM CDT by NWS Topeka KS
Nearby, since 15 March 2026
- July 31, 2026 · score 16 · 15.7 km
- May 17, 2026 · score 46 · 18.0 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 22 out of 100, at 67 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 22 / 100 |
| Our confidence | 67% |
| Coordinates | 39.7479, -96.0832 |
| Nearest City | Manhattan (76 km) |
| Impact Tier | minor |
| Timestamp | 2026-07-31T06:20:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.1ebe0c684444fa7e66ccaac362f1027e |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Brown, KS; Jackson, KS; Marshall, KS; Nemaha, KS; Pottawatomie, KS; Marshall, KS; Nemaha, KS |
| Headline | Severe Thunderstorm Warning issued July 31 at 1:20AM CDT until July 31 at 2:00AM CDT by NWS Topeka KS |
| Expires | 2026-07-31T02:00:00-05:00 |
| SenderName | NWS Topeka KS |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.1ebe0c684444fa7e66ccaac362f1027ed4c840e4.001.1","noaa_urn:oid:2.49.0.1.840.0.d653b894df1fd93c5e52a4e69b522a89051fd492.002.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 59 |
| Iem Unit | MPH |
| Iem City | 2 SSE Marysville |
| Iem County | Marshall |
| Iem State | KS |
| Iem Wfo | TOP |
| Iem Remark | Personal weather station. |
| MergedSources | [{"id":"iem_G_39.820_-96.640_1785476820000","source":"iem","severity":"low","severityValue":25,"timestamp":1785476820000,"latitude":39.82,"longitude":-96.64}] |
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 10 February 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.
Calamity.live data shows a weather event with CalamityScore 22/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.