SPC Issues Severe Thunderstorm Watch as WPC Flags Multi‑Regional Flash‑Flood Threats

Overview

• Severe Thunderstorm Watch 538 was issued for southeast Arizona and runs into the evening with primary threats of damaging wind gusts near 70 mph and isolated hail up to about 1 inch.
• SPC mesoscale discussions for north‑central Minnesota and parts of the southern High Plains note ongoing isolated severe risk including damaging gusts, hail, and a brief tornado threat near Brainerd.
• WPC issued a sequence of mesoscale precipitation discussions for the Southeast, Midwest, Mid‑Atlantic and Southwest that warn of training or slow storms producing common rates of 1–3+ inches per hour and spot totals of 2–4+ inches.
• Forecasters say the short‑fuse risks are driven by very high precipitable water, weak steering flow that allows back‑building and training convection, and localized mesoscale forcing identified by high‑resolution models and real‑time radar.
• Local impacts include urban runoff, flash flooding on saturated or steep terrain and burn scars, and disruptions to travel and aviation, so emergency managers and the public should monitor local warnings and radar for rapidly changing threats.