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Old Advisory Events

The information herein is NOT intended for use as a weather forecast. The Air District DOES NOT forecast but solely compiles information from both the Phoenix and San Diego National Weather Offices to relay information concerning potential changes in ambient air concentrations that may impact the public.

July 28 2017
Be Advised
High wind levels have the potential to suspend particulate matter into the air. High levels of PM10 may pose an impact to public health. It is recommended that active children and adults, and people with respiratory disease, such as asthma, limit their outdoor activities.

Potential increases in PM10 concentrations may increase to moderate or unhealthy level.

Imperial County Weather Synopsis
Seasonal summer weather through Friday with high pressure over the Southwest. Weak monsoonal flow returns over the weekend with isolated thunderstorms over the mountains and deserts Saturday and Sunday. The monsoonal pattern strengthens Monday and Tuesday with greater thunderstorm coverage over the mountains. Some thunderstorms may drift west of the mountains into the valleys. A gradual return to a SE monsoonal flow pattern will setup this weekend. On Saturday there will be a slight chance for mountain thunderstorms in the afternoon and evening and with dry lower levels there will be a slight risk for dry lightning strikes. Sunday through next week will see gradual increase in atmospheric moisture due to persistent SE flow in our region.
After a couple dry days, moisture will begin increasing late tonight ushering in an increased chance of storms across much of the region Friday through the weekend. Subsequently, high temperatures decrease as well...most noticeably over south-central Arizona. Looking beyond the weekend, we should see storm chances linger at least through early next week, but support aloft will wane as the inverted trough shifts to the west. A drying trend is likely for the second half of next week as models are showing the upper level high center shifting to the northwest over the Great Basin. This would bring a drying northeasterly flow and likely result in less storm activity, especially across the lower deserts. If this drier air sets up over the region, temperatures will climb back to above seasonal normals.
Weather Story Phoenix Station Weather Story San Diego Station
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