Phoenix Weather: Fall starts; Phoenix gets warm

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By Tami Hoey By Tami Hoey

PHOENIX -- Fall began Monday at 7:29 p.m., Arizona time. We’re looking at warmer than normal temperatures this week as a ridge of high pressure builds in from southwest of Arizona. It looks like that ridge will be right on top of Arizona on Wednesday, bringing us the warmest day this week. After that, as the ridge swifts away and weakens, we’ll see temperatures moderate.

Much cooler air is expected by next weekend as our first cold front of fall approaches from the Pacific. Ahead of that front, on Friday and Saturday, we’ll draw enough moisture into the state to result in scattered showers and thunderstorms. The chance for rain will peak in the Valley on Saturday at about a 30 percent chance, but highs are expected to drop into the 80s.

If we get any rain, the old-schoolers would tell you since it’s related to a cold front, it’s not monsoonal. However, with the recent definition that takes the monsoon, via the calendar, until the end of September, we could see some more “monsoon” rain before we’re finished.