First published 9/18/2026, 8:09:15 PM · Last updated 9/18/2026, 8:09:15 PM

Severe Thunderstorm Warning issued September 18 by NWS Greenville-Spartanburg SC

The National Weather Service Greenville-Spartanburg SC issued a Severe Thunderstorm Warning on September 18 at 2:40 PM EDT, valid until 3:15 PM EDT. The warning indicates an active severe thunderstorm capable of producing damaging winds, hail, and heavy rain.

Categories: severe-weather-and-natural-disasters

Generated scores

Scores are based on the cited reporting and use a 1–10 scale. Read the methodology.

Confidence: 9/10How certain the assessment is based on the clarity and evidence in the cited reporting.
Geographic reach: 3/10How widely the event reaches, from a local area (1) to worldwide impact (10).
Global importance: 6/10The event's broader significance, from limited importance (1) to major global importance (10).
Impact magnitude: 4/10The scale or severity of the real-world impact, from minor (1) to extreme (10).
Positivity: 2/10How harmful or beneficial the event is, from strongly harmful (1) to strongly positive (10).
Urgency: 9/10How time-sensitive the event is, from low urgency (1) to immediate attention needed (10).

Why it matters

Severe thunderstorms can cause property damage, downed trees and power lines, hazardous driving conditions, and risk of injury. People in the warned area should seek shelter and avoid travel if possible until the warning expires.

Location

Sources

Severe Thunderstorm Warning issued September 18 at 2:40PM EDT until September 18 at 3:15PM EDT by NWS Greenville-Spartanburg SC

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