Right now
The most recent data we hold from NOAA arrived 5 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 20 July 2026 at 21:45 UTC. It is kept here as a record.
No stronger detection stands among the 26 recorded within 20 km of this point since 14 April 2026 — 2 others scored the same. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Tornado Warning issued July 20 at 4:23PM CDT until July 20 at 4:45PM CDT by NWS Des Moines IA
An estimated 137,335 people live within 50 km of this point.
Nearby, since 14 April 2026
- June 10, 2026 · score 43 · 8.7 km
- July 2, 2026 · score 43 · 16.1 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 67 out of 100, at 80 % 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 | Critical |
| Calamity Score (ours) | 67 / 100 |
| Our confidence | 80% |
| Coordinates | 42.2860, -92.5840 |
| Nearest City | Cedar Falls (29 km) |
| Population Exposed | 137.3K within 50 km |
| Impact Tier | severe |
| Timestamp | 2026-07-20T21:23:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.ff378db2b94e31855ade899193b786d37e9d821d.001.1 |
Score Breakdown
Technical Details
| Event | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Black Hawk, IA; Grundy, IA; Tama, IA |
| Headline | Tornado Warning issued July 20 at 4:23PM CDT until July 20 at 4:45PM CDT by NWS Des Moines IA |
| Expires | 2026-07-20T16:45:00-05:00 |
| SenderName | NWS Des Moines IA |
| HasExactCoords | true |
Safety Information
If a tornado warning is issued: go to a basement or an interior room on the lowest floor, away from windows. A vehicle and a mobile home are not shelter. Cover your head and neck. Wait for the official all-clear before going outside, and watch for downed power lines and gas leaks afterwards.
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 Cedar Falls?
Calamity.live data shows a weather event with CalamityScore 67/100, near Cedar Falls (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.