This alert expired on 6 August 2026 at 13:15 UTC. It is kept here as a record.
It is the 2nd strongest of the 54 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: Flash Flood Warning issued August 6 at 5:22AM CDT until August 6 at 8:15AM CDT by NWS St Louis MO
An estimated 256,981 people live within 50 km of this point.
Nearby, since 15 March 2026
- June 1, 2026 · score 39 · 15.7 km
- March 16, 2026 · score 43 · 18.7 km
- August 1, 2026 · score 46 · 20.2 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 43 out of 100, at 82 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
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) | 43 / 100 |
| Our confidence | 82% |
| Coordinates | 38.5853, -91.1277 |
| Nearest City | Wentzville (35 km) |
| Population Exposed | 257.0K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-06T10:22:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.08e581fa784bff70c765e61c4b117119 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Franklin, MO; Montgomery, MO; Warren, MO |
| Headline | Flash Flood Warning issued August 6 at 5:22AM CDT until August 6 at 8:15AM CDT by NWS St Louis MO |
| Expires | 2026-08-06T08:15:00-05:00 |
| SenderName | NWS St Louis MO |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.08e581fa784bff70c765e61c4b117119a2905ab8.001.1","noaa_urn:oid:2.49.0.1.840.0.45a4570bd0b61570dd6e11062050a4285b9315e7.002.1"] |
Safety Information
During flooding: never walk, swim, or drive through floodwaters. Six inches of moving water can knock you down, and one foot of water can sweep away a vehicle. Move to higher ground if waters rise. After flooding, avoid contact with floodwater which may contain sewage, chemicals, or debris. Follow local emergency service guidance.
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.
Want to know when something happens in this area?
Calamity.live data shows a weather event with CalamityScore 43/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.