Severe Heat and Flooding Risks Loom for Millions Nationwide
WHO:
NBC News - Daniel Swain, a climate scientist with University of California Agriculture and Natural Resources, provided insights on the upcoming heat wave.
WHAT:
NBC News - Forecasters are expecting record triple-digit highs this weekend in Nevada, Utah, Colorado, Wyoming, Idaho, Montana, North Dakota, and South Dakota.
NBC News - The heat dome is expected to shift and wobble, potentially spreading from coast-to-coast over the next 10 days or more.
NBC News - A significant and dangerous heat wave is expected to hit most of America’s Lower 48 states, with temperatures 15 to 25 degrees Fahrenheit warmer than normal.
CBS News - Tens of millions of people are under heat alerts due to soaring temperatures that could lead to record-breaking heat over the weekend.
NBC News - The heat wave will last at least a week, with some areas feeling its effects until the end of the month.
WHERE:
NBC News - The heat dome will initially affect the Northern Plains but is expected to spread across as much as two-thirds of the continental United States, including states like Nevada, Utah, Colorado, Wyoming, Idaho, Montana, North Dakota, and South Dakota.
WHEN:
NBC News - The heat wave is set to start this weekend and may last until the end of the month.
NBC News - Forecasters expect record triple-digit highs this weekend.
WHY:
NBC News - The heat dome traps hot air like a pot lid while blocking cooling winds and rain, contributing to the extreme temperatures.
NBC News - The heat dome traps hot air while blocking cooling winds and rain, contributing to the extreme temperatures.
HOW:
NBC News - Meteorologists describe the upcoming heat wave as a long-duration, widespread, and high-intensity heat event that will affect millions of people for over a week.
NBC News - Meteorologists describe the heat dome as a large, strong, and long-lasting phenomenon that will affect millions of people for over a week.
(UPDATED July 10, 2026 17:34 UTC)
Forecasters are warning of record triple-digit highs this weekend across several states, including Nevada, Utah, Colorado, Wyoming, Idaho, Montana, North Dakota, and South Dakota. The heat dome, which traps hot air while blocking cooling winds and rain, is expected to shift and potentially spread its effects from coast-to-coast over the next ten days or more. Meteorologists describe this upcoming heat wave as a long-duration, widespread, and high-intensity event that will impact millions of people for over a week.
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(UPDATED July 10, 2026 16:48 UTC)
A significant and dangerous heat wave is set to impact most of America’s Lower 48 states, with temperatures soaring 15 to 25 degrees Fahrenheit above normal. Tens of millions of people are already under heat alerts, as forecasters predict record triple-digit highs starting this weekend and lasting for at least a week, with some areas feeling the effects until the end of the month. This extreme weather is caused by a heat dome, which traps hot air while blocking cooling winds and rain, affecting as much as two-thirds of the continental United States, including states like Nevada, Utah, and Colorado.