This alert expired on 6 June 2026 at 10:45 UTC. It is kept here as a record.
It is the 5th strongest of the 37 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 June 5 at 11:42PM CDT until June 6 at 5:45AM CDT by NWS Des Moines IA
An estimated 640,589 people live within 50 km of this point.
Nearby, since 15 March 2026
- June 11, 2026 · score 72 · 6.9 km
- May 16, 2026 · score 48 · 9.4 km
- May 22, 2026 · score 72 · 17.0 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 48 out of 100, at 81 % 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) | 48 / 100 |
| Our confidence | 81% |
| Coordinates | 40.8356, -95.8714 |
| Nearest City | Bellevue (34 km) |
| Population Exposed | 640.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-06T04:42:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.0a566465af73e524bb1a400b08777d32 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Marion, IA; Adair, IA; Adams, IA; Cass, IA; Clarke, IA; Madison, IA; Union, IA; Marion, IA; Warren, IA and 6 more areas |
| Headline | Flash Flood Warning issued June 5 at 11:42PM CDT until June 6 at 5:45AM CDT by NWS Des Moines IA |
| Expires | 2026-06-06T05:45:00-05:00 |
| SenderName | NWS Des Moines IA |
| HasExactCoords | true |
| MergedCount | 10 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.0a566465af73e524bb1a400b08777d32e936da91.001.1","noaa_urn:oid:2.49.0.1.840.0.2792ec1a743beb5fcc0bf96d9ee9324564eb813b.001.1","noaa_urn:oid:2.49.0.1.840.0.f07b58100de65a23bab3c36cf3777373aa034e2a.001.1","noaa_urn:oid:2.49.0.1.840.0.51d1f818e1494f7a22880afd54149f1fcd32ce4b.001.1","noaa_urn:oid:2.49.0.1.840.0.aca2785b830d0fd572ebe92da48ac3c83990a82b.001.1","noaa_urn:oid:2.49.0.1.840.0.a2575ecd5294f05f9fc4797477ecdc4ff8f85951.001.1","noaa_urn:oid:2.49.0.1.840.0.148efef689b25646507a4e45cd41defd69a426fb.001.1","noaa_urn:oid:2.49.0.1.840.0.2144956e61a3b2ec5d4e45213c10659fbc5fe476.001.1","noaa_urn:oid:2.49.0.1.840.0.eaffc5e229272f3ee50a54c41ef6c0d2a3e1a981.001.1","noaa_urn:oid:2.49.0.1.840.0.aa6039cb37ad5b81f89b6a97e5b1e5bfbed9467d.001.1"] |
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 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 48/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.