A record strong ridge of high pressure for this time of year will slide eastward and position itself over the Western US during the latter half of the work week, helping to push lower desert highs above 100 degrees today, then around or just above 105 degrees for Thursday-Saturday. Daily records will likely be broken by nearly 10 degrees through the weekend. Extreme Heat Warnings are in effect through Sunday for portions of the region (starting on Thursday for Southern Arizona).
Extreme Heat Warnings will be in effect for Southeast California starting today and Southern Arizona starting Thursday. They will remain in effect through Sunday. Not only will all-time March temperatures be broken (and likely April as well), but also the earliest occurrence of 100 degrees in the Phoenix area.
Phoenix and neighboring lower desert communities will almost certainly reach 100 degrees by the middle of next week. This would be the earliest occurrence of 100 degrees on record for the Phoenix area.
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