Phoenix weather: Triple-digit weekend; Another Ozone Health Watch today

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By Catherine Holland By Catherine Holland

PHOENIX -- The warmest temperatures of the year so far are forecast for the next couple of days, including our first triple digit highs of 2012. 

A ridge of high pressure is sitting over the Southwest and is set to strengthen over the next couple days, bringing afternoon temperatures to the upper 90s in the Valley Friday afternoon. 

Over the weekend, look for plenty of sunshine and highs near 100 on Saturday and 101 on Sunday/ The record for Sunday's high temperature is only 99 degrees, so it looks likely we'll set a new record. 

Monday looks likely to bring triple digits, too.  Overnight lows will dip to the low 60s in outlying areas and low 70s in town.  If you're running Pat's Run in Tempe Saturday morning, look for temperatures to be in the 60s and 70s under clear skies with light winds.

A change is forecast for the middle of next week.  A dry but windy cold front will move through Arizona on Thursday, dropping afternoon highs back to the mid 80s.

An Ozone Health Watch is in effect again today for the Valley.  Ground level ozone is expected to approach unhealthy levels this afternoon for a third day in a row.  Carpool if you can, and refuel after dark if you need to fill up your vehicle today.  If you have asthma or a sensitive respiratory system, you may want to limit your time outside, especially this afternoon, when ozone levels are expected to peak. 

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