This alert expired on 19 May 2026 at 02:15 UTC. It is kept here as a record.
It is the 7th strongest of the 15 detections recorded within 20 km of this point since 18 April 2026. The last comparable one was on 27 April 2026.
What the source measured
NOAA reported: Flash Flood Warning issued May 18 at 3:05PM CDT until May 18 at 9:15PM CDT by NWS St Louis MO
Nearby, since 18 April 2026
- August 1, 2026 · score 46 · 7.4 km
- July 31, 2026 · score 46 · 10.8 km
- June 1, 2026 · score 39 · 14.7 km
How we know
Confirmed by 8 independent sources, including NOAA.
Our own score for this event is 22 out of 100, at 71 % 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 | 71% |
| Coordinates | 38.3962, -91.3331 |
| Nearest City | Wildwood (62 km) |
| Impact Tier | minor |
| Timestamp | 2026-05-18T20:05:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.f51d25858704af1517e0bba1e5bf5148f039ac5f.001.1 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Crawford, MO; Franklin, MO; Gasconade, MO; Warren, MO |
| Headline | Flash Flood Warning issued May 18 at 3:05PM CDT until May 18 at 9:15PM CDT by NWS St Louis MO |
| Expires | 2026-05-18T21:15:00-05:00 |
| SenderName | NWS St Louis MO |
| HasExactCoords | true |
| Iem TypeSummary | R |
| Iem Magnitude | 2.08 |
| Iem Unit | Inch |
| Iem City | Sullivan |
| Iem County | Franklin |
| Iem State | MO |
| Iem Wfo | LSX |
| Iem Remark | Storm total rain. |
| MergedSources | [{"id":"iem_R_38.420_-90.780_1779131700000","source":"iem","severity":"low","severityValue":25,"timestamp":1779131700000,"latitude":38.42,"longitude":-90.78},{"id":"iem_E_38.670_-91.120_1779152280000","source":"iem","severity":"low","severityValue":25,"timestamp":1779152280000,"latitude":38.67,"longitude":-91.12},{"id":"iem_R_38.990_-91.010_1779150660000","source":"iem","severity":"low","severityValue":25,"timestamp":1779150660000,"latitude":38.99,"longitude":-91.01},{"id":"iem_R_38.800_-91.140_1779134160000","source":"iem","severity":"low","severityValue":25,"timestamp":1779134160000,"latitude":38.8,"longitude":-91.14},{"id":"iem_R_38.650_-90.640_1779148320000","source":"iem","severity":"low","severityValue":25,"timestamp":1779148320000,"latitude":38.65,"longitude":-90.64},{"id":"iem_R_38.480_-90.740_1779147960000","source":"iem","severity":"low","severityValue":25,"timestamp":1779147960000,"latitude":38.48,"longitude":-90.74},{"id":"iem_R_38.210_-91.160_1779154320000","source":"iem","severity":"low","severityValue":25,"timestamp":1779154320000,"latitude":38.21,"longitude":-91.16}] |
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 22/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.