Right now
The most recent data we hold from NOAA arrived 6 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 13 May 2026 at 22:32 UTC. It is kept here as a record.
No stronger detection stands among the 31 recorded within 20 km of this point since 2 April 2026 — 11 others scored the same. The last comparable one was on 11 April 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 13 at 4:22PM MDT until May 13 at 4:30PM MDT by NWS Salt Lake City UT
An estimated 50,371 people live within 50 km of this point.
Nearby, since 2 April 2026
- June 27, 2026 · score 39 · 20.3 km
- August 28, 2026 · score 39 · 26.0 km
How we know
Confirmed by 9 independent sources, including NOAA.
Our own score for this event is 39 out of 100, at 90 % 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) | 39 / 100 |
| Our confidence | 90% |
| Coordinates | 42.0552, -111.4775 |
| Nearest City | Logan (46 km) |
| Population Exposed | 50.4K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-13T22:22:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.3b7eba5ae12a2ded0fb0569a9ea367f1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Juab, UT; Sanpete, UT; Utah, UT; Box Elder, UT; Cache, UT; Davis, UT; Morgan, UT; Rich, UT; Weber, UT; Bear Lake, ID; Caribou, ID; Franklin, ID and 3 more areas |
| Headline | Severe Thunderstorm Warning issued May 13 at 4:22PM MDT until May 13 at 4:30PM MDT by NWS Salt Lake City UT |
| Expires | 2026-05-13T16:32:00-06:00 |
| SenderName | NWS Salt Lake City UT |
| HasExactCoords | true |
| MergedCount | 6 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.3b7eba5ae12a2ded0fb0569a9ea367f15dd0bad2.001.1","noaa_urn:oid:2.49.0.1.840.0.724a7b8725a48b3cb2c100428cff760b9a4c72cd.001.1","noaa_urn:oid:2.49.0.1.840.0.53e8f40917fa1539d27cd4b5dd22dfc5112fc263.001.1","noaa_urn:oid:2.49.0.1.840.0.d0ea7060ca6e5f66fdd1b9270d06e57d21e739f3.001.1","noaa_urn:oid:2.49.0.1.840.0.822062566dc78c28247eafe3c36a9c9c62d60f0f.001.1","noaa_urn:oid:2.49.0.1.840.0.4c3d1ddf224be8adc906b96f12964f9c25f1fb1d.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 60 |
| Iem Unit | MPH |
| Iem City | 3 ENE Collinston |
| Iem County | Box Elder |
| Iem State | UT |
| Iem Wfo | SLC |
| Iem Remark | Mesonet station UT30 SR-30. |
| MergedSources | [{"id":"iem_G_41.580_-112.070_1778707800000","source":"iem","severity":"low","severityValue":25,"timestamp":1778707800000,"latitude":41.58,"longitude":-112.07},{"id":"iem_G_41.710_-111.720_1778709600000","source":"iem","severity":"low","severityValue":25,"timestamp":1778709600000,"latitude":41.71,"longitude":-111.72},{"id":"iem_G_41.690_-112.160_1778707800000","source":"iem","severity":"low","severityValue":25,"timestamp":1778707800000,"latitude":41.69,"longitude":-112.16},{"id":"iem_G_41.780_-111.850_1778709240000","source":"iem","severity":"low","severityValue":25,"timestamp":1778709240000,"latitude":41.78,"longitude":-111.85},{"id":"iem_G_42.060_-111.800_1778710200000","source":"iem","severity":"low","severityValue":25,"timestamp":1778710200000,"latitude":42.06,"longitude":-111.8},{"id":"iem_G_41.610_-111.950_1778708400000","source":"iem","severity":"low","severityValue":25,"timestamp":1778708400000,"latitude":41.61,"longitude":-111.95},{"id":"iem_G_41.870_-111.810_1778709600000","source":"iem","severity":"low","severityValue":25,"timestamp":1778709600000,"latitude":41.87,"longitude":-111.81},{"id":"iem_G_41.780_-112.020_1778709000000","source":"iem","severity":"low","severityValue":25,"timestamp":1778709000000,"latitude":41.78,"longitude":-112.02}] |
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.
Want to know when something happens in this area?
Calamity.live data shows a weather event with CalamityScore 39/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.