SPC upgrades severe thunderstorm risk to Enhanced for Mid-Atlantic and Northern High Plains

SPC Day 1 Convective Outlook on June 6, 2026. Credit: SPC The National Weather Service Weather Prediction Center (WPC) and Storm Prediction Center (SPC) forecast severe thunderstorms and heavy rainfall across parts of the United States between UTC on June 6 and UTC on June 8. WPC Slight Risk (Level 2/4) areas for excessive rainfall cover portions of the Southern Plains, Central Plains, Middle Mississippi Valley, and Lower Mississippi Valley, while SPC Slight Risk (Level 2/5) areas for severe thunderstorms extend across parts of the Central Plains, Upper and Middle Mississippi Valley, Northern High Plains, Ohio Valley, and Northeast. Upper-level energy interacting with moisture flowing northward from the Gulf of Mexico supports widespread shower and thunderstorm development from the Southern Rockies and Southern Plains into the Lower Mississippi Valley. The heaviest rainfall on Saturday is forecast across portions of the Southern Plains, where localized flash flooding remains possible in urban areas, on roads, in small streams, and in low-lying locations. A frontal boundary extending from the Upper Great Lakes southwestward into the Central Plains is forecast to move eastward toward the Northeast through Sunday morning. Thunderstorms developing along and ahead of the boundary on Saturday may produce damaging wind gusts, large hail, frequent lightning, and tornadoes across parts of the Central Plains and the Upper and Middle Mississippi Valley. SPC Day 1 Convective Outlook on June 6, 2026. Credit: SPCHeavy rainfall is also forecast across portions of the Middle Mississippi Valley and Central Plains through Sunday morning. According to WPC guidance cited in the forecast discussion, localized flash flooding remains the primary concern across vulnerable areas. On Sunday, the front is forecast to reach the Ohio Valley and Northeast, where additional severe thunderstorms may develop. SPC has issued a Slight Risk (Level 2/5) for severe thunderstorms across parts of both regions through Monday morning, with forecast hazards including damaging winds, hail, frequent lightning, and tornado potential. Farther south, renewed thunderstorm development is forecast across portions of the Southern Plains and Lower Mississippi Valley on Sunday. WPC has outlined a Slight Risk (Level 2/4) for excessive rainfall across parts of the region, where heavy rainfall may produce localized flooding in urban areas, roads, small streams, and low-lying locations. The Northern High Plains face a separate severe-weather threat on Sunday as another frontal system moves eastward from the Northern Rockies. SPC has issued a Slight Risk (Level 2/5) for severe thunderstorms across parts of the region through Monday morning. Thunderstorms developing across the Northern High Plains may produce severe wind gusts, hail, and tornadoes.