Right now
The most recent data we hold from NOAA arrived 2 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 4 July 2026 at 14:15 UTC. It is kept here as a record.
It is the 3rd strongest of the 56 detections recorded within 20 km of this point since 16 March 2026. The last comparable one was on 3 July 2026. 16 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued July 4 at 3:15AM CDT until July 4 at 9:15AM CDT by NWS Des Moines IA
Urban PEI: 516,424 within a heuristic 50 km radius; not unique people.
Nearby, since 16 March 2026
- July 4, 2026 · score 48 · 0.0 km
- September 15, 2026 · score 37 · 7.6 km
- September 4, 2026 · score 37 · 11.9 km
How we know
5 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 48 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 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) | 48 / 100 |
| Legacy data-support index | 0.91/1 |
| Coordinates | 41.9791, -93.7141 |
| Nearest City | Ames (10 km) |
| Urban exposure index (PEI) | 516.4K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-04T08:15:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.696cfeac0e66e3ccf629b8ddc9d5109b |
Physical priority index · v1. 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: 2026-07-04T08:15:00.000Z.
First archived: 2026-07-04T08:29:25.337Z. 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 | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Calhoun, IA; Carroll, IA; Greene, IA; Sac, IA; Boone, IA; Dallas, IA; Hamilton, IA; Jasper, IA; Polk, IA; Story, IA; Webster, IA; Jasper, IA; Marshall, IA; Story, IA and 1 more areas |
| Headline | Flash Flood Warning issued July 4 at 3:15AM CDT until July 4 at 9:15AM CDT by NWS Des Moines IA |
| Expires | 2026-07-04T09:15:00-05:00 |
| SenderName | NWS Des Moines IA |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.696cfeac0e66e3ccf629b8ddc9d5109be3819d62.001.1","noaa_urn:oid:2.49.0.1.840.0.b0b4e18747568d9482484af19420101e4ef6ec04.001.1","noaa_urn:oid:2.49.0.1.840.0.e59fa4312c108154fbdd3a67f7c142f42b78ac76.001.1","noaa_urn:oid:2.49.0.1.840.0.d41def2dbeabef970fe908b178e7cdb86eb8bf25.001.1"] |
| Iem TypeSummary | F |
| Iem City | Nevada |
| Iem County | Story |
| Iem State | IA |
| Iem Wfo | DMX |
| Iem Remark | Vehicle stranded in a couple feet of water. Flash flooding observed in spots that are not known to flood in the area. |
| MergedSources | [{"id":"iem_G_41.540_-93.660_1783149540000","source":"iem","severity":"low","severityValue":25,"timestamp":1783149540000,"latitude":41.54,"longitude":-93.66},{"id":"iem_G_41.540_-93.660_1783149180000","source":"iem","severity":"low","severityValue":25,"timestamp":1783149180000,"latitude":41.54,"longitude":-93.66},{"id":"iem_G_41.510_-93.510_1783149000000","source":"iem","severity":"low","severityValue":25,"timestamp":1783149000000,"latitude":41.51,"longitude":-93.51},{"id":"iem_F_42.020_-93.450_1783146000000","source":"iem","severity":"low","severityValue":25,"timestamp":1783146000000,"latitude":42.02,"longitude":-93.45}] |
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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