This alert expired on 3 July 2026 at 22:15 UTC. It is kept here as a record.
No stronger detection stands among the 102 recorded within 20 km of this point since 16 March 2026 — 20 others scored the same. Another comparable one was recorded here earlier the same day. 32 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flood Warning issued July 3 at 2:50PM CDT until July 3 at 5:15PM CDT by NWS Des Moines IA
An estimated 547,016 people live within 50 km of this point.
Nearby, since 16 March 2026
- July 21, 2026 · score 48 · 1.1 km
- May 19, 2026 · score 48 · 3.6 km
- July 21, 2026 · score 48 · 5.6 km
How we know
Confirmed by 9 independent sources, including NOAA.
Our own score for this event is 48 out of 100, at 86 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
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 |
| Our confidence | 86% |
| Coordinates | 41.6633, -93.5547 |
| Nearest City | Altoona (8 km) |
| Population Exposed | 547.0K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-03T19:50:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flood Warning_noaa_urn:oid:2.49.0.1.840.0.c2afaa16d8ee410e239840f38294c518 |
Score Breakdown
Technical Details
| Event | Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Polk, IA |
| Headline | Flood Warning issued July 3 at 2:50PM CDT until July 3 at 5:15PM CDT by NWS Des Moines IA |
| Expires | 2026-07-03T17:15:00-05:00 |
| SenderName | NWS Des Moines IA |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.c2afaa16d8ee410e239840f38294c5184dc2191b.002.1","noaa_urn:oid:2.49.0.1.840.0.96c09bf477b84609919fab722c3ef3390b9f7b8e.001.1"] |
| Iem TypeSummary | R |
| Iem Magnitude | 7 |
| Iem Unit | Inch |
| Iem City | 2 NE Pleasant Hill |
| Iem County | Polk |
| Iem State | IA |
| Iem Wfo | DMX |
| Iem Remark | 24 hour rainfall totals as of 10:00 AM, as reported via social media. Location estimated. |
| MergedSources | [{"id":"iem_R_41.680_-93.240_1783099260000","source":"iem","severity":"low","severityValue":25,"timestamp":1783099260000,"latitude":41.68,"longitude":-93.24},{"id":"iem_R_41.770_-93.720_1783088400000","source":"iem","severity":"low","severityValue":25,"timestamp":1783088400000,"latitude":41.77,"longitude":-93.72},{"id":"iem_R_41.660_-93.360_1783096200000","source":"iem","severity":"low","severityValue":25,"timestamp":1783096200000,"latitude":41.66,"longitude":-93.36},{"id":"iem_R_41.730_-93.410_1783090020000","source":"iem","severity":"low","severityValue":25,"timestamp":1783090020000,"latitude":41.73,"longitude":-93.41},{"id":"iem_R_41.790_-93.510_1783091400000","source":"iem","severity":"low","severityValue":25,"timestamp":1783091400000,"latitude":41.79,"longitude":-93.51},{"id":"iem_R_41.830_-93.540_1783089120000","source":"iem","severity":"low","severityValue":25,"timestamp":1783089120000,"latitude":41.83,"longitude":-93.54},{"id":"iem_R_41.780_-93.800_1783093140000","source":"iem","severity":"low","severityValue":25,"timestamp":1783093140000,"latitude":41.78,"longitude":-93.8},{"id":"iem_R_41.610_-93.480_1783090800000","source":"iem","severity":"low","severityValue":25,"timestamp":1783090800000,"latitude":41.61,"longitude":-93.48}] |
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.
Want to know when something happens near Altoona?
Calamity.live data shows a weather event with CalamityScore 48/100, near Altoona (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.