Overview
- National Weather Service Extreme Heat Warnings are active in the Phoenix area from Thursday through Sunday, with some northern Arizona zones starting Wednesday as forecasts call for 100°–105° later this week.
- Forecasters say Phoenix and Las Vegas could log their earliest 100° days on record, with Phoenix also eyeing the first 105° in March and the most March triple‑digit days ever recorded.
- Record March warmth is spreading across the West, with Bay Area sites already breaking records, southern California targeting 100°+, and Denver projected to challenge all‑time March highs.
- Fire Weather Watches and red‑flag concerns stretch across parts of the West and Plains as very warm, dry and windy conditions elevate wildfire risk and speed snowmelt, with Colorado utilities urging water conservation.
- In sharp contrast, the East and parts of the Midwest remain in a late‑season cold snap with sub‑freezing mornings and damaging gusts, including 62 mph at Boston’s Logan Airport that downed trees and cut power.