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.

May 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
High pressure aloft will bring the hottest temperatures of the week for desert areas today. Coastal areas will be cooler with areas of night and morning low clouds and fog spreading into the far western valleys this morning...and farther into the valleys for Wednesday morning with slow cooling spreading inland. A trough of low pressure over the western states will bring stronger onshore flow and greater cooling for Thursday and Friday with strong gusty southwest to west winds in the mountains and deserts. The marine layer will deepen with low clouds extending into the far inlands Thursday morning...and onto the coastal mountain slopes for late Thursday night into Friday morning with a slight chance of light showers along and west of the mountains. High pressure aloft near the West Coast will bring a warming trend for the holiday weekend with high temperatures for inland areas warming to near average on Sunday and a little above average on Memorial Day. The marine layer and weak onshore flow will keep coastal areas cooler with areas of night and morning low clouds and fog.
SYNOPSIS FROM THE PHOENIX OFFICE
High pressure building in from the west will continue to warm temperatures across the region through the middle of the week, with high temperatures rising well above 100 degrees at many lower desert locations. Cooler temperatures will return by the latter portion of the week and early weekend as low pressure once again moves into the western US. Advisory conditions may develop as early as Wednesday, but look likely for Thursday over the Peninsular Ranges between San Diego and El Centro with gusts of 45 mph or greater possible. Ridgetop winds will eventually mix and expand down into the lower elevations during the day Thursday with gusts for the western deserts ranging 30 to 35 mph.
Weather Story Phoenix Station Weather Story San Diego Station
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