Phoenix weather: Mild week but changes coming

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By Jennifer Thomas By Jennifer Thomas

PHOENIX -- It was a cloudy and mild start to the new week with Valley lows in the 50s Monday morning and thick fog in the high country. We'll see a bit of blue sky this afternoon, though, and a high of 77 degrees.  That's about 10 degrees above average for this time of year.

There is a High Pollution Advisory in effect for Maricopa County today for high levels of fine particles. A stagnant air mass and forecast light winds will keep that brown cloud present over the Valley for at least another day. Conditions are worse during the morning hours when an inversion is present, trapping those particles closer to the ground. People with a sensitive respiratory system are urged to limit their time outside today, and everyone is encouraged to carpool if they can. It is also a No Burn Day in Maricopa County. 

Dry and warm conditions are expected through most of this workweek as strong high pressure sits over our region. Look for high clouds from time to time, but well-above-average afternoon temperatures in the mid to upper 70s and mild overnight lows in the 40s to 50s around town. 

Changes are forecast starting Friday as a strong and cold low pressure system moves onshore in California. This will arrive in Arizona Friday night and Saturday, bringing a chance of Valley rain, high country snow and cooler temperatures statewide. Keep it tuned to 3TV for the latest on this storm as we get closer to its arrival.