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.

October 20 2016
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
Hot and dry weather continues through Friday with gusty northeast winds for wind prone areas in the coastal foothills and inland valleys. Onshore flow brings a cooling trend this weekend especially on Sunday. Even cooler, with increasing clouds and a chance of precipitation Sunday afternoon through Monday, due to a surgeof subtropical moisture ahead of a large upper trough moving onto the West Coast. Dry and a little warmer for Tuesday and Wednesday as a weak high pressure ridge builds over the Southwest.

A small patch of stratus just off the coast from Orange County early this morning, otherwise skies continue to be clear around the region, with a solid offshore flow with pressure gradients around 13 mb from the Great Basin to the SoCal coast.

Strong offshore pattern will continue today and temperatures will likely be the hottest today west of the mountains. Temperatures will reach the 90s just away from the immediate coast and into the
mid 90s to around 100 in the valleys and inland Orange County. As funny as it may sound, relief from the heat today could be found in the desert where temps will only be in the lower 80s in the high desert such as Victorville and Apple Valley. Even the Coachella Valley will be relatively moderate in the lower to mid 90s. Gusty winds will continue to be a concern today with a wind advisory remaining in effect west of the mountains, especially in the favorable offshore areas through and below the canyons and foothills.

SYNOPSIS FROM THE PHOENIX OFFICE
Dry weather with mostly clear skies will continue across the Desert Southwest the rest of the week and into the weekend. Temperatures will continue to be unseasonably warm, and breezy weather at times will last into Friday. By Sunday afternoon, a large Pacific low pressure system will move into the western states. This will draw a considerable amount of subtropical moisture into the region from the southwest direction, with a slight chance of showers Sunday afternoon persisting through Tuesday, mainly over south central
Arizona.
Weather Story Phoenix Station Weather Story San Diego Station
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