Right now
The most recent data we hold from NOAA arrived 8 minutes ago, and this point is in it.
3 other detections within 20 km in the last 24 hours, the nearest 5 km from here.
This alert is in force until 9 September 2026, 05:30 UTC.
It is the 3rd strongest of the 119 detections recorded within 20 km of this point since 16 March 2026. The last comparable one was on 8 September 2026.
What the source measured
NOAA reported: Flash Flood Warning issued September 8 at 9:19PM CDT until September 9 at 12:30AM CDT by NWS Des Moines IA
An estimated 531,891 people live within 50 km of this point.
Nearby, since 16 March 2026
- September 8, 2026 · score 48 · 5.2 km
- July 21, 2026 · score 48 · 8.8 km
- May 19, 2026 · score 48 · 9.5 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 48 out of 100, at 92 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | High |
| Calamity Score (ours) | 48 / 100 |
| Our confidence | 92% |
| Coordinates | 41.7033, -93.6583 |
| Nearest City | Ankeny (5 km) |
| Population Exposed | 531.9K within 50 km |
| Impact Tier | severe |
| Timestamp | 2026-09-09T02:19:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.afcd2122a07d43a4beb377bb6cab770f59eee4df.001.1 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Dallas, IA; Polk, IA |
| Headline | Flash Flood Warning issued September 8 at 9:19PM CDT until September 9 at 12:30AM CDT by NWS Des Moines IA |
| Expires | 2026-09-09T00:30:00-05:00 |
| SenderName | NWS Des Moines IA |
| HasExactCoords | true |
| Spc ReportType | hail |
| Spc Speed | 150 |
| Spc Location | Mitchellville |
| Spc County | Polk |
| Spc State | IA |
| Spc Comments | Report from mPING: Ping Pong Ball (1.50 in.). (DMX) |
| Iem TypeSummary | H |
| Iem Magnitude | 1.75 |
| Iem Unit | Inch |
| Iem City | Mitchellville |
| Iem County | Polk |
| Iem State | IA |
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.
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