Right now
The most recent data we hold from NOAA arrived 52 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 June 2026 at 23:15 UTC. It is kept here as a record.
No stronger detection stands among the 20 recorded within 20 km of this point since 11 April 2026 — 7 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: Severe Thunderstorm Warning issued June 20 at 5:02PM MDT until June 20 at 5:15PM MDT by NWS Salt Lake City UT
Urban PEI: 307,379 within a heuristic 50 km radius; not unique people.
Nearby, since 11 April 2026
- June 20, 2026 · score 43 · 10.6 km
- June 25, 2026 · score 43 · 16.2 km
- August 29, 2026 · score 43 · 16.8 km
How we know
2 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 | 0.85/1 |
| Coordinates | 41.5100, -111.9280 |
| Nearest City | Brigham City (8 km) |
| Urban exposure index (PEI) | 307.4K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-20T23:02:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.e230a267a23bc03c1658e3472816d7949f3a85a0.001.1 |
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: 2026-06-20T23:02:00.000Z.
First archived: 2026-06-20T23:06:47.023Z. 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 | Box Elder, UT; Cache, UT; Weber, UT |
| Headline | Severe Thunderstorm Warning issued June 20 at 5:02PM MDT until June 20 at 5:15PM MDT by NWS Salt Lake City UT |
| Expires | 2026-06-20T17:15:00-06:00 |
| SenderName | NWS Salt Lake City UT |
| HasExactCoords | true |
| Iem TypeSummary | G |
| Iem Magnitude | 46 |
| Iem Unit | MPH |
| Iem City | 1 ESE Clifton |
| Iem County | Franklin |
| Iem State | ID |
| Iem Wfo | PIH |
| Iem Remark | Gust of 46 Mph, heavy rain. |
| MergedSources | [{"id":"iem_G_42.180_-111.980_1781993700000","source":"iem","severity":"low","severityValue":25,"timestamp":1781993700000,"latitude":42.18,"longitude":-111.98}] |
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.
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