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.

September 6 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
Flash Flood Warning for Riverside County in southern California until 730 PM PDT
At 425 PM PDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Up to one inch of rain has already fallen. Flash flooding is expected to begin shortly. Some locations that will experience flooding include Desert Center on Interstate 10 and highway 177 north of Desert Center.

SYNOPSIS FROM THE SAN DIEGO OFFICE
Increased moisture and instability will lead to isolated mountain and high desert thunderstorms this afternoon and early evening. Today should be slightly warmer than yesterday. A decrease in moisture and instability on Thursday will lead to minimal chances for mountain and lower desert thunderstorms. A cooling trend will occur Thursday through Saturday as a cut-off low develops off the coast. The low will bring increasing moisture Friday through Sunday, with better chances for afternoon and early evening thunderstorms in the mountains and deserts each day. Warming expected Sunday through Monday as a ridge moves into the area, and weather should be dry for Monday and Tuesday. Expect continued night and morning marine layer clouds over the coast and portions of the valleys.
SYNOPSIS FROM THE PHOENIX OFFICE
Limited moisture will keep thunderstorms primarily relegated to higher elevations of eastern and central Arizona through Thursday. However, a few lighter showers will be possible even during the morning hours across parts of western Arizona and southeast California. Increasing moisture Friday and Saturday will provide much better chances for showers and thunderstorms across the entire region. Drier conditions and a warming trend will return early next week as strong high pressure builds back over the area.
Weather Story Phoenix Station Weather Story San Diego Station
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