Warmer Thursday, cooler weekend

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PHOENIX -- Look for a nice, warm Thursday and then a slightly cooler weekend ahead. 

Under a dry, westerly flow, Valley highs will top out near 78 degrees today under mostly sunny skies.

Mostly clear skies will bring overnight lows down to the 40s and 50s. 

Tomorrow, we'll start to see some high clouds stream into the state as a low-pressure system sweeps by to our north.  Expect partly sunny skies all weekend, along with slightly cooler temperatures.  We'll top out in the low 70s on Saturday and upper 60s on Sunday. 

Windy conditions are expected in Northern Arizona both Friday and Saturday, along with a slight chance of showers.  

A storm Monday brings a 30-percent chance of rain to the Valley and a better chance of snow to the high country Sunday and Monday.