ACCELERATING RISK: Severe Storm Threat Expands Sunday to Encompass 40 Million Across Central U.S.

On May 17, 2026, we track the massive geographic expansion of the ongoing severe weather outbreak. We break down the SPC’s Level 3 Enhanced Risk, the volatile $3,500\text{ J/kg}$ CAPE atmospheric profile fueling long-track tornado potential in the Upper Midwest, and the overnight transition into a destructive straight-line wind event.