A historic heat dome is causing an early and intense heat wave across the Eastern U.S., with record-breaking temperatures and high humidity, posing health risks and highlighting the impact of climate change.
Northern California experienced its first triple-digit temperatures of 2024, with highs reaching 100 degrees or more in several cities, elevating wildfire risks due to accompanying winds. Wednesday is forecasted to be even hotter, with temperatures between 100 to 105 degrees, prompting fire danger warnings. Firefighters are preparing for increased activity as residents seek relief by heading to waterways. Temperatures are expected to lower to the 90s by the weekend.
A heat dome is set to bring extreme, triple-digit temperatures to the Southwest starting Tuesday, affecting over 25 million Americans under a heat alert. Central California, southern Nevada, and western Arizona will experience temperatures 20 degrees above normal, with Las Vegas and Phoenix expected to hit 111 degrees by Wednesday. The heat dome is expected to last until Thursday, with severe health impacts anticipated. Residents are advised to stay hydrated and avoid direct sunlight.
After hitting 100°F for the first time this year, New Mexico is set to experience more triple-digit heat this week. Monsoon moisture is gradually making its way into the state, leading to the development of scattered storms on Monday. Burn scar flash flooding is possible in certain areas, along with strong winds and heavy rainfall. While spotty afternoon storm chances will persist in some parts of New Mexico, high pressure will continue to bring above-average heat, with temperatures soaring into the 90s and triple-digits across the lower elevations.
Northern California is bracing for its first triple-digit heatwave of the season, with temperatures expected to reach 101 to 106 degrees on Friday and continue throughout the Fourth of July weekend. The Sacramento region has declared a Spare the Air Day due to unhealthy air quality, and residents are advised to clean their air conditioning filters for better efficiency. The Sierra region, however, is expected to have a pleasant day with no thunderstorms. Saturday is predicted to be the peak day of the heatwave, with temperatures reaching 105 degrees or higher in some areas. Temperatures will gradually decrease starting Monday, with mid-90s expected for the Fourth of July.