Sunday will be cloudy and humid with storm chances rising by Tuesday

Posted: Updated:
PHOENIX (3TV/CBS 5) -

High humidity and high clouds continue to stream into the Valley as the remnants of tropical system Lidia remain southwest of Arizona.

This stream of moisture should keep Sunday afternoon's temperatures near or slightly below normal for this time of the year.

Despite the moisture, there's not much instability to fuel thunderstorms today, so storm activity will be confined mainly to southwestern Arizona and along the Mexico Arizona border, with isolated storms expected across the Mogollon Rim and White Mountains this afternoon.

Low-grade monsoon conditions continue for the high country for Labor Day Monday. The Valley is expected to see a decrease in cloud cover and remain storm free.

By Tuesday, high pressure across the Great Basin will allow a disturbance to rotate into Arizona from New Mexico. This will bring the best chance of the week for storms to develop in Metro Phoenix during the afternoon and evening hours. Greater storm coverage will be in the mountains that day. The potential of outflows drifting off the mountains and into the Valley will bring a threat of gusty winds and isolated heavy rain. 

Storm chances drop off again heading into the end of the week.

For Sunday in Phoenix, look for partly cloudy skies and a high of 105. Labor Day Monday will include sunshine and a high of 107. Storm chances are at 20 to 30 percent Tuesday afternoon with a high of 107. Highs will remain near 105 through the remainder of next week.

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