Winter Storm Watch in Rockies and Heat Dome in East Bring Contrasting Extremes

A winter storm watch is in effect for the Rockies and Intermountain West as of late June 2026 while a heat dome brings dangerous heat and humidity to the eastern half of the United States, Usa Today reported. The National Weather Service issued the watch for the region, where a deep upper-level low is driving temperatures 15 to 20 degrees below normal.

Highs in valleys across Idaho and surrounding states are struggling to reach the 50s and 60s through the weekend.

Late-June mountain snow is possible at higher elevations in the Rockies, with high elevation snow expected Saturday night into Sunday night, according to the National Weather Service in Billings, Montana. Widespread showers and scattered thunderstorms are occurring across the Rockies and Intermountain West. Stronger storms may generate wind gusts of 30 to 40 mph.

A strengthening heat dome is causing dangerous heat and humidity across the eastern half of the country, the Weather Prediction Center stated. Highs in the 90s are expected as far north as the Great Lakes and Minnesota, with highs in the 100s for much of Texas. Heat indices approaching 110 degrees are possible from the mid-South to the central Gulf Coast.

Overnight lows will be quite warm, with some record high minimums possible in the East. For much of next week the core of the heat dome is likely to be centered on the Ohio Valley, the middle portion of the Mississippi Valley and the Tennessee Valley, AccuWeather reported.

Repeated rounds of showers and thunderstorms are expected from the Plains into the Midwest, Ohio Valley and portions of the Mid-Atlantic through the weekend, the Storm Prediction Center said.