This alert expired on 19 May 2026 at 08:22 UTC. It is kept here as a record.
It is the 2nd strongest of the 30 detections recorded within 20 km of this point since 16 May 2026. Another comparable one was recorded here earlier the same day. 21 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued May 19 at 3:12AM CDT until May 19 at 3:15AM CDT by NWS Des Moines IA
Nearby, since 16 May 2026
- May 16, 2026 · score 46 · 9.6 km
How we know
Confirmed by 5 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.
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) | 22 / 100 |
| Our confidence | 71% |
| Coordinates | 40.8045, -94.4236 |
| Nearest City | Indianola (95 km) |
| Impact Tier | minor |
| Timestamp | 2026-05-19T08:12:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.31e9f9f5be2e996d278593aa1e45e9e8644db43d.001.1 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Decatur, IA; Ringgold, IA; Taylor, IA |
| Headline | Flash Flood Warning issued May 19 at 3:12AM CDT until May 19 at 3:15AM CDT by NWS Des Moines IA |
| Expires | 2026-05-19T03:22:00-05:00 |
| SenderName | NWS Des Moines IA |
| HasExactCoords | true |
| Iem TypeSummary | R |
| Iem Magnitude | 3.5 |
| Iem Unit | Inch |
| Iem City | 4 N Mount Ayr |
| Iem County | Ringgold |
| Iem State | IA |
| Iem Wfo | DMX |
| Iem Remark | hwy 169 and 190th intersection closed due to at least 4 inches of mud sliding into the road. This was after around 3.5 inches of rain had fallen. |
| MergedSources | [{"id":"iem_F_40.710_-94.240_1779158100000","source":"iem","severity":"low","severityValue":25,"timestamp":1779158100000,"latitude":40.71,"longitude":-94.24},{"id":"iem_F_40.780_-94.200_1779158100000","source":"iem","severity":"low","severityValue":25,"timestamp":1779158100000,"latitude":40.78,"longitude":-94.2},{"id":"iem_F_40.710_-94.240_1779158160000","source":"iem","severity":"low","severityValue":25,"timestamp":1779158160000,"latitude":40.71,"longitude":-94.24},{"id":"iem_R_40.770_-94.220_1779158100000","source":"iem","severity":"low","severityValue":25,"timestamp":1779158100000,"latitude":40.77,"longitude":-94.22}] |
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 22/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.