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Record Heat Wave Hits Arizona, Trails Close for Safety

3/20/2026

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Summary

Story summary

A historic heat wave grips Arizona as Phoenix records 102 degrees on March 18, the earliest triple-digit temperature.
The National Weather Service (NWS) warns of dangerous heat and closes popular hiking trails during March 19 to 22.
Residents are advised to take precautions against heat-related illnesses, especially during outdoor activities like spring training.
The NWS notes El Niño could bring cooler temperatures later despite the heat spike.

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Story summary

A historic heat wave grips Arizona as Phoenix records 102 degrees on March 18, the earliest triple-digit temperature.
The National Weather Service (NWS) warns of dangerous heat and closes popular hiking trails during March 19 to 22.
Residents are advised to take precautions against heat-related illnesses, especially during outdoor activities like spring training.
The NWS notes El Niño could bring cooler temperatures later despite the heat spike.