Severe weather in United States
This alert expired on 9 August 2026 at 23:50 UTC. It is kept here as a record.
No stronger detection stands among the 12 recorded within 20 km of this point since 17 May 2026 — 6 others scored the same. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 9 at 4:40PM PDT until August 9 at 4:45PM PDT by NWS Las Vegas NV
An estimated 47,894 people live within 50 km of this point.
Nearby, since 17 May 2026
- August 11, 2026 · score 34 · 16.7 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 34 out of 100, at 86 % 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) | 34 / 100 |
| Our confidence | 86% |
| Coordinates | 34.9060, -116.6640 |
| Nearest City | Barstow (32 km) |
| Population Exposed | 47.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-09T23:40:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.6dfe13f0696a1f56d097532265e3a69a99c1ae3d.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | San Bernardino, CA |
| Headline | Severe Thunderstorm Warning issued August 9 at 4:40PM PDT until August 9 at 4:45PM PDT by NWS Las Vegas NV |
| Expires | 2026-08-09T16:50:00-07:00 |
| SenderName | NWS Las Vegas NV |
| HasExactCoords | true |
| Iem TypeSummary | G |
| Iem Magnitude | 64 |
| Iem Unit | MPH |
| Iem City | 4 SSE Yermo |
| Iem County | San Bernardino |
| Iem State | CA |
| Iem Wfo | VEF |
| Iem Remark | Barstow Daggett Airport gusted to 64 mph from a nearby thunderstorm. |
| MergedSources | [{"id":"iem_G_34.850_-116.790_1786316280000","source":"iem","severity":"low","severityValue":25,"timestamp":1786316280000,"latitude":34.85,"longitude":-116.79}] |
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 34/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.