Isolated storms this weekend become widespread next week

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By Christina O'Haver By Christina O'Haver

PHOENIX -- Low-grade monsoon days are on tap this weekend as high pressure sits over Arizona and pulls in a slightly drier air mass.

Even though dew points Saturday morning sat in the upper 60s across southern Arizona, the mid levels of the atmosphere were slightly drier.

By the afternoon, isolated storms were seen only across eastern and southeastern Arizona, while the Valley saw mostly clear skies and near-normal temperatures. The official high Saturday afternoon at Phoenix Sky Harbor was 106 after a morning low of 87.

The same setup looks to be on tap for Sunday. In the Phoenix-metro, look for mostly sunny skies, a slight chance of evening storms and a high of about 106.

On Monday, an area of low pressure will track down the west coast and into southern California, while high pressure tracks towards New Mexico. This setup will allow deep monsoon moisture to filter into Arizona, reinvigorating storm chances for the Valley.

By Monday evening, the Phoenix-metro will have a 30 percent chance of storms. On Tuesday, storm chances kick up to 40 percent. As monsoon moisture increases, temperatures Tuesday through Wednesday will be back down to the upper 90s for highs across the Valley.