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 14 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
Morning marine based stratus clouds will linger through late morning today near the coast, otherwise it will be slightly cooler today as high pressure weakens. The marine layer will then deepen with clouds filling the coast, valleys and coastal slopes during nights and mornings Saturday through Monday, with only partial clearing during the days. Light rain showers and drizzle are possible over and west of the mountains Sunday and Monday mornings. Blustery winds and cooler temperatures are also expected in the mountains and deserts as onshore flow strengthens. The gusty winds could bring some patchy blowing dust and sand in the deserts. High pressure aloft and offshore flow look to bring back dry and much warmer weather by the middle of next week.

High pressure ridge aloft gradually weakens today and allows for the onshore pattern to strengthen across SoCal. Gradients pick up Saturday with gusty onshore winds likely in the mountains and deserts late Saturday through late Sunday, which could also pick up some blowing dust and sand in the deserts, mainly during the afternoons and evenings. Peak wind gusts Saturday and Sunday will likely be mainly below wind advisory levels, although quite gusty nonetheless, with gusts around 20 to 30 mph for the coast and valleys, 30 to 40 mph for the deserts, and 40 to 50 mph for the wind favored mountain passes and slopes.

The tail end of the massive low system in the PacNW will clip SoCal Sat-Sun with a weak shortwave trough, which will bring a chance of light showers and areas of drizzle near the coast from the deep marine layer. A slightly better chance of showers over the mesas and along the mountain slopes, although just about anywhere from the mountains to the coast could see some light shower activity this weekend, although any actual rainfall amounts will be under one-tenth of an inch.

Troughy pattern will knock temperatures down to slightly below normal levels especially for the valleys and mountains. Windy conditions and temperatures in the 30s will be downright chilly in the mountains this weekend through Monday!

SYNOPSIS FROM THE PHOENIX OFFICE
Strong high pressure over the region will keep dry conditions in place through the next several days. Temperatures will remain above normal through the period as well
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