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Severe weather is plaguing the US from coast to coast, bringing a mix of extreme heat and bitter cold.
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In Phoenix, Arizona, the National Weather Service (NWS) forecasts temperatures could exceed 100F (38C) as soon as Wednesday, the earliest arrival of triple-digit heat to the city in nearly four decades.
A strong, slow-moving high-pressure system - often called a heat dome - is trapping hot air over the region, pushing temperatures 20–30F above normal in parts of California, Nevada, and Arizona.
The heat is expected to persist for several days, with limited overnight cooling adding to the strain. Millions are likely to be affected.
Highs are expected to reach well above 90F in many areas, including typically cooler coastal regions, while inland and desert locations could exceed 100F, with some spots approaching or surpassing 110F, challenging long-standing March records.
NWS has issued heat advisories for parts of California, including the Bay Area and central coast, where temperatures could reach around 90F.
Residents in the affected areas are being warned to check on the elderly and other at-risk groups as temperatures climb, and to schedule events around peak heat.
"Extreme early-season heat coupled with high tourism rates will make this heat very dangerous, particularly for those not acclimated to the heat and/or traveling from cooler climates," the Las Vegas, Nevada NWS office said.
Forecasters warn this could be a prolonged event, with only gradual relief possible by the weekend or early next week, raising concerns about health risks and broader environmental impacts.
The heatwave also poses a serious threat to California's already below-average snowpack, accelerating melt at a time when it would normally build or decline slowly.
With temperatures running far above normal, snow in the Sierra Nevada is likely to melt weeks earlier than usual, reducing the amount of water that can be gradually released into reservoirs later in the year.
This rapid runoff increases the risk of summer water shor
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