Right now
The most recent data we hold from NOAA arrived 1 minute 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 2 July 2026 at 21:45 UTC. It is kept here as a record.
It is the 9th strongest of the 62 detections recorded within 20 km of this point since 16 March 2026. Another comparable one was recorded here earlier the same day. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 2 at 4:25PM CDT until July 2 at 4:45PM CDT by NWS Des Moines IA
Urban PEI: 109,715 within a heuristic 50 km radius; not unique people.
Nearby, since 16 March 2026
- July 5, 2026 · score 43 · 9.0 km
- August 7, 2026 · score 67 · 9.5 km
- August 11, 2026 · score 43 · 10.3 km
How we know
5 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 43 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) | 43 / 100 |
| Legacy data-support index | 0.88/1 |
| Coordinates | 42.5520, -92.0388 |
| Nearest City | Waterloo (26 km) |
| Urban exposure index (PEI) | 109.7K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-02T21:25:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.e512686a17e53cabd93d12b7cc3a24ec |
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: 2026-07-02T21:25:00.000Z.
First archived: 2026-07-02T21:28:49.969Z. 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 | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Webster, IA; Calhoun, IA; Pocahontas, IA; Webster, IA; Jasper, IA; Polk, IA and 6 more areas |
| Headline | Severe Thunderstorm Warning issued July 2 at 4:25PM CDT until July 2 at 4:45PM CDT by NWS Des Moines IA |
| Expires | 2026-07-02T16:45:00-05:00 |
| SenderName | NWS Des Moines IA |
| HasExactCoords | true |
| MergedCount | 9 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.e512686a17e53cabd93d12b7cc3a24ec58829aad.001.1","noaa_urn:oid:2.49.0.1.840.0.bc10eb3386726ad1a0daef426898a00c3abc853b.001.1","noaa_urn:oid:2.49.0.1.840.0.9e6cfcaf0ab441f17721a3a52b35e0ec533fe7c7.001.1","noaa_urn:oid:2.49.0.1.840.0.1cbf1a235f7950b18398abe7907054213ab23a2b.001.1","noaa_urn:oid:2.49.0.1.840.0.1b10ed377c6db5343d717ff7ebba0b5caa568601.001.1","noaa_urn:oid:2.49.0.1.840.0.796be441050110b156169b550820942b5634d9bd.001.1","noaa_urn:oid:2.49.0.1.840.0.47c9b81cea9a252b9ac8f7fc176012cd18f3c4ea.001.1","noaa_urn:oid:2.49.0.1.840.0.34efc30e5edcca5aff2262118605c31a699a6166.001.1","noaa_urn:oid:2.49.0.1.840.0.8cc333c72d1f4006969c6858ce5c750f0e7ef34f.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 59 |
| Iem Unit | MPH |
| Iem City | 3 E Charles City |
| Iem County | Floyd |
| Iem State | IA |
| Iem Wfo | ARX |
| Iem Remark | Personal weather station. |
| MergedSources | [{"id":"iem_D_42.680_-91.930_1783018080000","source":"iem","severity":"low","severityValue":25,"timestamp":1783018080000,"latitude":42.68,"longitude":-91.93},{"id":"iem_H_42.760_-91.800_1783018860000","source":"iem","severity":"low","severityValue":25,"timestamp":1783018860000,"latitude":42.76,"longitude":-91.8},{"id":"iem_H_42.770_-91.800_1783018860000","source":"iem","severity":"low","severityValue":25,"timestamp":1783018860000,"latitude":42.77,"longitude":-91.8},{"id":"iem_G_43.060_-92.610_1783015260000","source":"iem","severity":"low","severityValue":25,"timestamp":1783015260000,"latitude":43.06,"longitude":-92.61}] |
Safety Information
Always follow official guidance from your local emergency management agency. This platform provides scientific monitoring data and is not a substitute for official warnings. If you are in immediate danger, contact your local emergency number.
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 Waterloo?