US Midwest/Northeast: Record heat to precede sharp cold snap, frost, snow risk

A record heat wave is forecast to affect the central and eastern United States, with highs above 32°C in several cities, before a drastic temperature drop this weekend as cold air from Canada brings near-freezing lows, frost in rural areas, and possible snowfall in elevated Northeast areas. The rapid swing from extreme heat to freezing conditions poses risks to agriculture, energy demand, and public health, though the exact timing and severity remain uncertain.