This alert expired on 28 May 2026 at 22:00 UTC. It is kept here as a record.
It is the 5th strongest of the 16 detections recorded within 20 km of this point since 25 May 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 May 28 at 3:48PM MDT until May 28 at 4:00PM MDT by NWS Boise ID
An estimated 457,100 people live within 50 km of this point.
Nearby, since 25 May 2026
- July 24, 2026 · score 48 · 15.9 km
- June 27, 2026 · score 48 · 23.5 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 43 out of 100, at 78 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 43 / 100 |
| Our confidence | 78% |
| Coordinates | 43.4800, -116.0294 |
| Nearest City | Boise (20 km) |
| Population Exposed | 457.1K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-28T21:48:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.1955abdb48bec30a821c5724f519cd3c |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Ada, ID; Canyon, ID; Elmore, ID; Owyhee, ID; Ada, ID; Boise, ID; Canyon, ID; Elmore, ID; Gem, ID; Owyhee, ID |
| Headline | Severe Thunderstorm Warning issued May 28 at 3:48PM MDT until May 28 at 4:00PM MDT by NWS Boise ID |
| Expires | 2026-05-28T16:00:00-06:00 |
| SenderName | NWS Boise ID |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.1955abdb48bec30a821c5724f519cd3cf01a816c.001.1","noaa_urn:oid:2.49.0.1.840.0.bb718e3f01988dc6ce65fbdcc1d601de242da6b7.001.1"] |
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 10 February 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.
Calamity.live data shows a weather event with CalamityScore 43/100, near Boise (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.