Heat wave expected to bring record-breaking temps, heighten wildfire risk to parts of Western U.S.

A severe heat wave is poised to deliver record-breaking temperatures across the Western United States this weekend, raising alarms about public health and significantly increasing wildfire risks in drought-stricken areas.

A powerful ridge of high pressure, described as a "heat dome," is trapping intense heat near the ground from Arizona to Montana. Meteorologists with the National Weather Service anticipate extreme conditions, with Las Vegas forecasting a high of 115 degrees Fahrenheit (46 Celsius), Phoenix reaching 116F (47C), and El Centro, California, potentially hitting a record 118F (48C). Even parts of Montana are expected to experience unusual heat, with Great Falls forecast to reach 104F (40C), surpassing its previous record.

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There's just no relief overnight

The danger is amplified by high overnight low temperatures, with lows in the upper 80s to low 90s offering little respite for the body to recover. "There's just no relief overnight," noted weather service meteorologist Morgan Stessman. Residents are strongly advised to remain indoors, stay hydrated, and take precautions against the extreme heat.

Forecasters are particularly concerned about the combined impact of this heat wave and existing dryness on wildfire activity. "We're definitely worried about that" in Montana, where existing fires and predicted high winds create a volatile situation. In Nevada, the heat dome has contributed to a sharp decrease in relative humidity, with afternoon levels dropping into the single digits in many locations, further elevating the risk of fires igniting and spreading rapidly.

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We're definitely worried about that