Extremely dangerous heat wave expands from Midwest to East Coast. Thunderstorms may produce large hail, damaging wind gusts and tornadoes across the northern Plains and Upper Mississippi Valley. Repeating storms may lead to flash flooding in parts of the Southern High Plains. pic.x.com/MXyMJXbPlY

Though record high temperatures are expected in the coming days, the duration of the heat as demonstrated by the numerous record warm morning lows will make this period especially oppressive. Couple this with the fact that this is the first major heat wave of the year – when our pic.x.com/2UfoRdvgFs

This map shows high temperatures measured so far today at various locations across CONUS. Notice it's hot nearly everywhere, except the Pacific Northwest/portions of the Intermountain West. 😁 Which area do you prefer? pic.x.com/kbeehpwtn8

Over the past decade the Gulf has seen a huge spike in heat, and likely coincidently (or maybe not) a huge spike in Major Hurricane landfalls. Today is #ShowYourStripes day! Thanks @ed_hawkins for the telling visual. Get yours: ShowYourStripes.info observablehq.com/@climatecentral/stripes-day pic.x.com/3cAAUlyzJy