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.

December 8 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
HIGH WIND WARNING
Until 4 pm PST this afternoon for Riverside County Mountains-San Bernardino County Mountains-San Bernardino and Riverside County Valleys-The Inland Empire-San Diego County Mountains-San Diego County Valleys-San Gorgonio Pass Near Banning-Santa Ana Mountains and Foothills.

RED FLAG WARNING REMAINS IN EFFECT THROUGH SATURDAY
Until 8 PM PST Sunday for Orange County Inland Areas-Riverside County Mountains-Including the San Jacinto Ranger District of the San Bernardino National Forest-San Bernardino County Mountains-Including the Mountain Top and Front Country Ranger Districts of the San Bernardino National Forest-San Bernardino and Riverside County Valleys and Orange County Coastal Areas

The Inland Empire-San Diego County Coastal Areas-San Diego County Inland Valleys-San Diego County Mountains-Including the Palomar and Descanco Ranger Districts of the Cleveland National Forest-San Gorgonio Pass Near Banning-Santa Ana Mountains-Including the Trabuco Ranger District of the Cleveland National Forest.

SYNOPSIS FROM THE SAN DIEGO OFFICE
Winds have really died off a bit overnight with the strongest winds now in the most wind favored areas such as Palomar Mountain and Mount Laguna which are gusting to around 50 mph. Expect a resurgence of Santa Ana winds after daybreak with gusts of 50 to 60 mph, below coastal mountain slopes and through and below the passes and canyons.

WEEKEND
Warm and very dry conditions will persist over the weekend and into early next week with the upper ridge along the west coast and light to moderate offshore winds at times. A cutoff low tries to form in the Tue-Wed timeframe and meanders around Northern Mexico but would not be likely to bring anything but some chunks of high-level cloudiness at times.

While some stronger Santa Ana winds could develop around mid next week this is not likely to be much change to the pattern otherwise with warm (daytime temperatures up to 15 degrees above normal) and dry weather through next weekend. With the very dry airmass in place, diurnal swings away from the coast will be so strong that temperatures at night will be quite chilly in the valleys and deserts.

SYNOPSIS FROM THE PHOENIX OFFICE
The weather will remain very tranquil through the weekend as seasonable temperatures warm back above average. Dry conditions will also continue through at least the middle of next week with only varying amounts of high clouds.
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