This alert expired on 6 August 2026 at 13:20 UTC. It is kept here as a record.
It is the 3rd strongest of the 38 detections recorded within 20 km of this point since 15 March 2026. Another comparable one was recorded here earlier the same day. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued August 6 at 8:10AM CDT until August 6 at 8:15AM CDT by NWS St Louis MO
An estimated 153,926 people live within 50 km of this point.
Nearby, since 15 March 2026
- March 15, 2026 · score 67 · 2.7 km
- August 12, 2026 · score 43 · 7.7 km
- June 21, 2026 · score 48 · 16.1 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 43 out of 100, at 91 % 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) | 43 / 100 |
| Our confidence | 91% |
| Coordinates | 38.2731, -90.8487 |
| Nearest City | Wildwood (38 km) |
| Population Exposed | 153.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-06T13:10:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.76939bf53d3f97154f319989a46e0cec |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Franklin, MO; Washington, MO |
| Headline | Flash Flood Warning issued August 6 at 8:10AM CDT until August 6 at 8:15AM CDT by NWS St Louis MO |
| Expires | 2026-08-06T08:20:00-05:00 |
| SenderName | NWS St Louis MO |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.76939bf53d3f97154f319989a46e0cec1af426b0.001.1","noaa_urn:oid:2.49.0.1.840.0.bccb97ceff2d5ec592b9cc93d1c184a7491bc9ba.001.1"] |
| Iem TypeSummary | F |
| Iem City | 3 ESE Union |
| Iem County | Franklin |
| Iem State | MO |
| Iem Wfo | LSX |
| Iem Remark | Roundabout on Denmark Rd flooded. Cars stuck in flood waters. |
| MergedSources | [{"id":"iem_F_38.430_-90.890_1786013820000","source":"iem","severity":"low","severityValue":25,"timestamp":1786013820000,"latitude":38.43,"longitude":-90.89},{"id":"iem_F_38.430_-90.950_1786015080000","source":"iem","severity":"low","severityValue":25,"timestamp":1786015080000,"latitude":38.43,"longitude":-90.95}] |
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 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.
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.