Calamity
MediumSevere WeatherCalamity Score: 32

Severe Weather in United States

ChesterfieldUnited StatesNOAA

Right now

The most recent data we hold from NOAA arrived 1 minute ago, and this point is in it.

2 other detections within 20 km in the last 24 hours, the nearest 3 km from here.

This alert is in force until 11 September 2026, 21:45 UTC.

It is the 5th strongest of the 40 detections recorded within 20 km of this point since 18 June 2026. The last comparable one was on 6 September 2026. 31 more were recorded here in the fortnight before it.

What the source measured

NOAA reported: Severe Thunderstorm Warning issued September 11 at 5:01PM EDT until September 11 at 5:45PM EDT by NWS Raleigh NC

An estimated 53,735 people live within 50 km of this point.

Nearby, since 18 June 2026

How we know

One source: NOAA. Not yet confirmed by a second, independent source.

Our own score for this event is 32 out of 100, at 80 % confidence.

The score is ours, computed from intensity, exposed population and local history — not the source’s.

Computed under scoring rules v4. Rows carrying other versions were judged by different rules and are not directly comparable.

Event Data

TypeSevere Weather
SeverityMedium
Calamity Score (ours)32 / 100
Our confidence80%
Coordinates34.5498, -79.9164
Nearest CityFlorence (41 km)
Population Exposed53.7K within 50 km
Impact Tiersignificant
Timestamp2026-09-11T21:01:00.000Z
Sourcehttps://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.0ea25ffea76f73e4092a6d04813d78746abbd453.001.1

Score Breakdown

35
intensity
55
population
0
cascading
18
historical

Technical Details

EventSevere Thunderstorm Warning
UrgencyImmediate
CertaintyObserved
AreaDescScotland, NC; Kershaw, SC; Lee, SC; Sumter, SC
HeadlineSevere Thunderstorm Warning issued September 11 at 5:01PM EDT until September 11 at 5:45PM EDT by NWS Raleigh NC
Expires2026-09-11T17:45:00-04:00
SenderNameNWS Raleigh NC
HasExactCoordstrue
MergedCount2
MergedIds["noaa_urn:oid:2.49.0.1.840.0.0ea25ffea76f73e4092a6d04813d78746abbd453.001.1","noaa_urn:oid:2.49.0.1.840.0.65dad3c6e66330c9e5dcc7f771da7876b1918fee.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 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?

Share:XLinkedIn