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 28 May 2026 at 22:15 UTC. It is kept here as a record.
It is the 8th strongest of the 19 detections recorded within 20 km of this point since 25 May 2026. The last comparable one was on 25 May 2026. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 28 at 3:38PM MDT until May 28 at 4:15PM 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 · 6.8 km
- May 28, 2026 · score 43 · 10.2 km
- June 27, 2026 · score 48 · 18.7 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 43 out of 100, at 84 % 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) | 43 / 100 |
| Our confidence | 84% |
| Coordinates | 43.5712, -116.0375 |
| Nearest City | Boise (14 km) |
| Population Exposed | 457.1K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-28T21:38:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.bb718e3f01988dc6ce65fbdcc1d601de242da6b7.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Ada, ID; Boise, ID; Canyon, ID; Elmore, ID; Gem, ID; Owyhee, ID |
| Headline | Severe Thunderstorm Warning issued May 28 at 3:38PM MDT until May 28 at 4:15PM MDT by NWS Boise ID |
| Expires | 2026-05-28T16:15:00-06:00 |
| SenderName | NWS Boise ID |
| HasExactCoords | true |
| Iem TypeSummary | G |
| Iem Magnitude | 61 |
| Iem Unit | MPH |
| Iem City | Mountain Home Afb |
| Iem County | Elmore |
| Iem State | ID |
| Iem Wfo | BOI |
| MergedSources | [{"id":"iem_G_43.050_-115.870_1780003680000","source":"iem","severity":"low","severityValue":25,"timestamp":1780003680000,"latitude":43.05,"longitude":-115.87}] |
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 near Boise?