Overview
- The multi‑day outbreak, ongoing Tuesday, June 23, has already produced measured gusts above 90 mph, appreciable damage near Colby, Kansas, and a reported 109 mph gust near Akron, Colorado.
- Forecasters say splitting high‑precipitation supercells are repeatedly growing upscale into cold‑pool‑driven mesoscale convective systems that can form long wind swaths with widespread 60–75 mph gusts and isolated 85–100 mph gusts.
- The Storm Prediction Center and local offices warn that supercells remain capable of producing very large hail commonly 1–3 inches in diameter with some stones locally exceeding 2–3 inches.
- The Weather Prediction Center highlighted corridors where storms can produce 1–2 inches per hour rainfall rates and training totals of 2–3+ inches, creating a near‑term flash‑flood threat especially over already wet soils.
- Operational forecasters are monitoring for additional downstream severe‑thunderstorm watches and short‑fused local warnings, and residents in the High Plains, central Plains, Midwest, and parts of the Mid‑Atlantic should be prepared to take shelter for high winds, hail, or flooding.