This alert expired on 11 August 2026 at 22:15 UTC. It is kept here as a record.
It is the 7th strongest of the 41 detections recorded within 20 km of this point since 26 May 2026. Another comparable one was recorded here earlier the same day. 15 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 11 at 5:32PM EDT until August 11 at 6:15PM EDT by NWS Greenville-Spartanburg SC
An estimated 95,143 people live within 50 km of this point.
Nearby, since 26 May 2026
- August 29, 2026 · score 39 · 11.3 km
- July 29, 2026 · score 37 · 15.1 km
- July 18, 2026 · score 32 · 15.2 km
How we know
Confirmed by 11 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.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 39 / 100 |
| Our confidence | 90% |
| Coordinates | 35.5308, -81.7909 |
| Nearest City | Morganton (26 km) |
| Population Exposed | 95.1K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-11T21:32:00.000Z |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Henderson, NC; Transylvania, NC; Greenville, SC; Alexander, NC; Iredell, NC |
| Headline | Severe Thunderstorm Warning issued August 11 at 5:32PM EDT until August 11 at 6:15PM EDT by NWS Greenville-Spartanburg SC |
| Expires | 2026-08-11T18:15:00-04:00 |
| SenderName | NWS Greenville-Spartanburg SC |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.0f6778c7ce27aaa94d75920d502ffcde2096ff2e.001.1","noaa_urn:oid:2.49.0.1.840.0.14ec24cc3ef1bdaeee72fd8d6b01516113067f7e.001.1"] |
| Iem TypeSummary | D |
| Iem City | 1 NW Glenwood |
| Iem County | McDowell |
| Iem State | NC |
| Iem Wfo | GSP |
| Iem Remark | Multiple trees down on road. |
| MergedSources | [{"id":"iem_H_35.960_-81.540_1786474200000","source":"iem","severity":"low","severityValue":25,"timestamp":1786474200000,"latitude":35.96,"longitude":-81.54},{"id":"iem_D_35.730_-81.860_1786478100000","source":"iem","severity":"low","severityValue":25,"timestamp":1786478100000,"latitude":35.73,"longitude":-81.86},{"id":"iem_D_35.700_-82.030_1786480980000","source":"iem","severity":"low","severityValue":25,"timestamp":1786480980000,"latitude":35.7,"longitude":-82.03},{"id":"iem_D_35.680_-81.990_1786481340000","source":"iem","severity":"low","severityValue":25,"timestamp":1786481340000,"latitude":35.68,"longitude":-81.99},{"id":"iem_D_35.740_-81.880_1786478100000","source":"iem","severity":"low","severityValue":25,"timestamp":1786478100000,"latitude":35.74,"longitude":-81.88},{"id":"iem_H_35.680_-82.010_1786481400000","source":"iem","severity":"low","severityValue":25,"timestamp":1786481400000,"latitude":35.68,"longitude":-82.01},{"id":"iem_H_35.650_-81.970_1786481880000","source":"iem","severity":"low","severityValue":25,"timestamp":1786481880000,"latitude":35.65,"longitude":-81.97},{"id":"iem_D_35.970_-81.580_1786473600000","source":"iem","severity":"low","severityValue":25,"timestamp":1786473600000,"latitude":35.97,"longitude":-81.58},{"id":"iem_H_35.970_-81.570_1786473600000","source":"iem","severity":"low","severityValue":25,"timestamp":1786473600000,"latitude":35.97,"longitude":-81.57},{"id":"iem_D_35.620_-81.990_1786482720000","source":"iem","severity":"low","severityValue":25,"timestamp":1786482720000,"latitude":35.62,"longitude":-81.99}] |
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 39/100, near Morganton (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.