AIR POLLUTION
CONTROL DISTRICT

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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.

June 23 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
SYNOPSIS FROM THE SAN DIEGO OFFICE
Southern California weather will continue to be dominated by a ridge of high pressure. The center of the ridge will lie over southern Arizona through the weekend and actually re-strengthen over the local area this weekend. This will continue excessive heat across the deserts through the weekend and even into Monday for the lower deserts. It will continue to be slightly cooler west of the mountains through Friday before conditions heat back up over the weekend inland from the coast, especially Sunday. The immediate coast will continue cool due to the continued influence of the marine layer. The ridge of high pressure will gradually become displaced south over northwestern Mexico and the adjacent Pacific next week, leading to gradual cooling area wide.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES...
Excessive Heat Lower Deserts Through Monday; High Deserts Through Sunday
Heat Advisory Issued for the Inland Empire, Mountains Below 5000
Feet Including the Santa Ana Foothills, and Inland San Diego
County Effective on Sunday
A hot ridge of high pressure will continue to dominate the weather across Southern California through the weekend. The strength of the ridge has lessened and continues to be situated over Arizona. However, model consensus shows the ridge re-strengthening across the area this weekend. In fact, H85 temps climb to near what occurred this past Tue-Wed. This will lead to an increase in temperatures with perhaps another shot at 120F degrees across the lower deserts by Sunday. This long duration desert heat wave continues.
SYNOPSIS FROM THE PHOENIX OFFICE
Anticipate little change in temperatures Friday as high pressure remains situated across northern Mexico. Temperatures increase over the weekend. Storm chances return to the higher terrain as well. Temperatures start to decline on Monday but still excessively hot in some areas. Modest additional cooling is anticipated Tuesday and Wednesday.
Weather Story Phoenix Station Weather Story San Diego Station
Image for Phoenix Station Weather Story Image for San Diego Station Weather Story

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