An unusually intense early-season heat wave is sweeping across the western United States, with temperatures soaring to levels more typical of midsummer and threatening to break both March and April records in the coming days.
Meteorologists say the region is experiencing unprecedented warmth for this time of year, with forecasts calling for temperatures to approach or exceed 100 degrees in multiple states. In some areas, highs are expected to surpass historical March records by more than 10 degrees, while a few locations could challenge national temperature records typically seen later in spring.
Cities across the West are bracing for extreme heat. Forecasts include temperatures near 99 degrees in Los Angeles, 107 degrees in Palm Springs and 106 degrees in Phoenix — roughly 25 degrees above normal for mid-March. Las Vegas is expected to reach 100 degrees, while even typically cooler areas such as San Francisco and Salt Lake City are forecast to see temperatures well above seasonal averages.
The surge in heat is being driven by a strong high-pressure system, often referred to as a “heat dome,” that has settled over the Southwest. The system traps warm air and blocks cooler weather patterns, allowing temperatures to build and persist over several days.
Forecasters warn the heat poses health risks, particularly for vulnerable populations, pets and anyone left in enclosed spaces such as vehicles, where temperatures can rise rapidly. The unseasonable warmth is expected to last into late March, extending what has already been the warmest March on record nationwide in terms of daytime highs.
Beyond immediate health concerns, the heat wave is also raising longer-term environmental risks. Rapid snowmelt is already occurring across higher elevations, which could strain water supplies later in the year. At the same time, drought conditions are expected to persist or worsen across much of the Intermountain West and parts of the Plains, increasing the likelihood of wildfires in the months ahead.
Climate scientists note that while heat domes are not new, rising global temperatures are making such events more intense. As a result, extreme heat episodes like this one are becoming more severe and more likely to occur outside traditional summer months.
Source: Weather Channel