Right now
The most recent data we hold from NOAA arrived 9 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
3 other detections within 20 km in the last 24 hours, the nearest 8 km from here.
This alert expired on 20 September 2026 at 16:15 UTC. It is kept here as a record.
It is the 42nd strongest of the 71 detections recorded within 20 km of this point since 15 March 2026. The last comparable one was on 19 September 2026. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued September 20 at 5:45AM CDT until September 20 at 11:15AM CDT by NWS Quad Cities IA IL
Urban PEI: 278,494 within a heuristic 50 km radius; not unique people.
Nearby, since 15 March 2026
- July 10, 2026 · score 43 · 10.3 km
- September 9, 2026 · score 37 · 11.2 km
- July 11, 2026 · score 43 · 11.4 km
How we know
2 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 37 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) | 37 / 100 |
| Legacy data-support index | 0.86/1 |
| Coordinates | 42.0000, -91.2395 |
| Nearest City | Marion (30 km) |
| Urban exposure index (PEI) | 278.5K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-20T10:45:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.f638f8b5f62b48bea0e850e7f2bb57dabc5e3ac0.001.1 |
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: 2026-09-20T10:45:00.000Z.
First archived: 2026-09-20T10:50:34.408Z. Material modification: 2026-09-20T13:04:23.764Z.
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 | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Delaware, IA; Dubuque, IA; Jackson, IA; Jones, IA; Jo Daviess, IL; Cedar, IA; Iowa, IA; Johnson, IA; Keokuk, IA; Louisa, IA; Muscatine, IA; Washington, IA |
| Headline | Flash Flood Warning issued September 20 at 5:45AM CDT until September 20 at 11:15AM CDT by NWS Quad Cities IA IL |
| Expires | 2026-09-20T11:15:00-05:00 |
| SenderName | NWS Quad Cities IA IL |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.f638f8b5f62b48bea0e850e7f2bb57dabc5e3ac0.001.1","noaa_urn:oid:2.49.0.1.840.0.4869b9520d1330eae140da0719644f70ccd94469.001.1"] |
| Iem TypeSummary | R |
| Iem Magnitude | 2.25 |
| Iem Unit | Inch |
| Iem City | 1 WNW Fruitland |
| Iem County | Muscatine |
| Iem State | IA |
| Iem Wfo | DVN |
| Iem Remark | 12 hour total. |
| MergedSources | [{"id":"iem_R_42.040_-91.590_1789893960000","source":"iem","severity":"low","severityValue":25,"timestamp":1789893960000,"latitude":42.04,"longitude":-91.59},{"id":"iem_F_42.090_-91.660_1789901400000","source":"iem","severity":"low","severityValue":25,"timestamp":1789901400000,"latitude":42.09,"longitude":-91.66},{"id":"iem_R_42.010_-91.660_1789897500000","source":"iem","severity":"low","severityValue":25,"timestamp":1789897500000,"latitude":42.01,"longitude":-91.66},{"id":"iem_R_41.700_-90.550_1789894740000","source":"iem","severity":"low","severityValue":25,"timestamp":1789894740000,"latitude":41.7,"longitude":-90.55},{"id":"iem_R_41.350_-91.140_1789907460000","source":"iem","severity":"low","severityValue":25,"timestamp":1789907460000,"latitude":41.35,"longitude":-91.14}] |
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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