Right now
The most recent data we hold from NOAA arrived 5 minutes ago, and this point is in it.
5 other detections within 20 km in the last 24 hours, the nearest <1 km from here.
This alert is in force until 16 September 2026, 14:30 UTC.
It is the 6th strongest of the 14 detections recorded within 20 km of this point since 6 June 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: Flood Warning issued September 15 at 9:17PM CDT until September 17 at 2:23AM CDT by NWS Des Moines IA
Nearby, since 6 June 2026
- September 16, 2026 · score 28 · 20.3 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 16 out of 100.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
Computed under scoring rules v5. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 16 / 100 |
| Legacy data-support index | 0.61/1 |
| Coordinates | 41.2791, -94.4385 |
| Nearest City | Waukee (59 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-09-16T02:17:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.c249e171a9259b51ccdd9ebdbc976aa7d0beb8e9.001.1 |
Physical priority index · v5. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: noaa. Occurrence: 2026-09-16T02:17:00.000Z.
First archived: 2026-09-16T02:19:23.027Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
Score Breakdown
Technical Details
| Event | Flood Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Polk, IA; Adair, IA; Montgomery, IA |
| Headline | Flood Warning issued September 15 at 9:17PM CDT until September 17 at 2:23AM CDT by NWS Des Moines IA |
| Expires | 2026-09-16T09:30:00-05:00 |
| SenderName | NWS Des Moines IA |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.c249e171a9259b51ccdd9ebdbc976aa7d0beb8e9.001.1","noaa_urn:oid:2.49.0.1.840.0.7c82d702fc88e589d8af40e38251ff8c829a9c42.001.1","noaa_urn:oid:2.49.0.1.840.0.7360b537cf9b79a58cc8c751e431705209f43b03.001.1"] |
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 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.
Review the area, threshold and delivery channel in your account.
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