Right now
The most recent data we hold from NOAA arrived 67 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
This alert expired on 3 July 2026 at 10:15 UTC. It is kept here as a record.
What the source measured
NOAA reported: Flash Flood Warning issued July 3 at 2:58AM CDT until July 3 at 5:15AM CDT by NWS Des Moines IA
Urban PEI: 547,016 within a heuristic 50 km radius; not unique people.
How we know
9 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 | 41.6958, -93.4848 |
| Nearest City | Altoona (7 km) |
| Urban exposure index (PEI) | 547.0K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-03T07:58:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.b3d4798702ac7ce92aee226cacbd2b5d |
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: 2026-07-03T07:58:00.000Z.
First archived: 2026-07-03T08:51:12.818Z. 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 | Jasper, IA; Polk, IA; Polk, IA |
| Headline | Flash Flood Warning issued July 3 at 2:58AM CDT until July 3 at 5:15AM CDT by NWS Des Moines IA |
| Expires | 2026-07-03T05:15:00-05:00 |
| SenderName | NWS Des Moines IA |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.b3d4798702ac7ce92aee226cacbd2b5dc315575c.001.1","noaa_urn:oid:2.49.0.1.840.0.8f42d863ae5cb27a418d6a55a0ffe52503d7b1ed.001.1"] |
| Iem TypeSummary | R |
| Iem Magnitude | 4.98 |
| Iem Unit | Inch |
| Iem City | 2 NNW Alleman |
| Iem County | Polk |
| Iem State | IA |
| Iem Wfo | DMX |
| Iem Remark | Iowa Flood Center gage near NW 2nd St at Alleman. |
| MergedSources | [{"id":"iem_E_41.790_-93.570_1783063320000","source":"iem","severity":"low","severityValue":25,"timestamp":1783063320000,"latitude":41.79,"longitude":-93.57},{"id":"iem_R_41.770_-93.590_1783058520000","source":"iem","severity":"low","severityValue":25,"timestamp":1783058520000,"latitude":41.77,"longitude":-93.59},{"id":"iem_R_41.900_-93.530_1783053780000","source":"iem","severity":"low","severityValue":25,"timestamp":1783053780000,"latitude":41.9,"longitude":-93.53},{"id":"iem_R_41.750_-93.620_1783058160000","source":"iem","severity":"low","severityValue":25,"timestamp":1783058160000,"latitude":41.75,"longitude":-93.62},{"id":"iem_R_41.830_-93.540_1783053900000","source":"iem","severity":"low","severityValue":25,"timestamp":1783053900000,"latitude":41.83,"longitude":-93.54},{"id":"iem_F_41.780_-93.570_1783061280000","source":"iem","severity":"low","severityValue":25,"timestamp":1783061280000,"latitude":41.78,"longitude":-93.57},{"id":"iem_R_41.820_-93.610_1783062600000","source":"iem","severity":"low","severityValue":25,"timestamp":1783062600000,"latitude":41.82,"longitude":-93.61},{"id":"iem_R_41.840_-93.620_1783060320000","source":"iem","severity":"low","severityValue":25,"timestamp":1783060320000,"latitude":41.84,"longitude":-93.62}] |
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.
Want to know when something happens near Altoona?