The Storm Prediction Center’s Day 1 convective outlooks for September 1, 2026, placed a Slight risk of severe thunderstorms across the Northeast and Mid-Atlantic, citing 2% tornado probabilities tied to moderate CAPE, 35–45 kt effective shear, and strengthening low-level winds near a surface front. New York, Philadelphia, and surrounding population centers fell within the highest-probability corridor, while a separate marginal-to-slight area extended into the northern/central Plains and Upper Midwest, where discrete supercells were possible amid steep lapse rates. Tropical Storm Edouard’s outer bands added a localized 2% tornado threat along the southeast Texas/southwest Louisiana coast through modest destabilization and enhanced low-level hodographs. These official NWS products, updated throughout the day, anchored trader assessments of city-specific risk ahead of any post-event verification data.