Late last week, westerly winds brought a drying trend that has given us our first break in this year’s monsoon. The thunderstorm activity decreased slowly last week, due to plentiful low-atmospheric moisture, and last Saturday, a rare funnel cloud was observed northeast of the airport. Several people reported sighting the funnel. My student, Adam Dentinger, is credited with the attached photograph of the funnel taken during flight last Saturday just before 11 am.
Ultimately the westerly winds aloft have brought mostly sunny weather to last through Wednesday. A ridge of high pressure aloft will rebuild into Utah beginning Thursday, bringing southerly wind and moist air back across Arizona Thursday through the coming weekend for an increasing chance of thunderstorms each day Thurs-Sun.
Next Monday – Tuesday, another even stronger low pressure system is predicted to form along the California Coast and possibly bring a second break to the monsoon starting about next Tuesday. More details forthcoming…
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Official National Weather Service forecast