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.

November 9 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
DESERT SLOPES/DESERTS
Skies becoming scattered at or above 20000 feet mean sea level at after 10pm Friday with visibility greater than 6 statute miles and light winds

DISCUSSION FROM THE SAN DIEGO OFFICE
At 9 am PST, water vapor satellite imagery displayed an upper-level low off the coast of the Pacific NW, and an upper-level ridge over Cabo San Lucas creating a zonal flow aloft over SW CA. Clouds were well inland into the mountain slopes this morning and observation showed a few areas reported drizzle.

The forecast will sound like a broken record over the next week as SW CA remains in a consistent pattern between upper-level lower pressure to the north and upper-level ridging to the south. This will result in a deep to moderately deep marine layer each day, with stream of high clouds at times. Highs over the coastal basin will be a few degrees below normal, while areas of the mountains and deserts see highs a few degrees above seasonal normal.

Winds will remain onshore through the period. Breezy west winds will develop along the typical areas of the desert mountain slopes and adjacent areas for the middle of next week as a trough begins to set up along the West Coast. No measurable precipitation is expected across the region for the next 7 days at this time.

DISCUSSION FROM THE PHOENIX OFFICE
The stagnant weather pattern across the Southwestern United States should continue through next week as the storm track remains through the Pacific Northwest. Westerly zonal flow with heights aloft near to above climatological normal will persist over the Desert Southwest for the foreseeable future. Current conditions show another round of high clouds pushing out of the region as a fast moving weak ridge axis shifts into central New Mexico. Today will be one of the few clear to mostly clear days of the forecast before additional mid and upper level moisture moves in from the west starting Friday.
Weather Story Phoenix Station Weather Story San Diego Station
Image for Phoenix Station Weather Story Image for San Diego Station Weather Story

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