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.

February 22 2018
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
IMPERIAL COUNTY

Gusty west winds are forecasted for Imperial County today and tonight.

A windy day is in store for southeastern California and Imperial County. West winds will increase during the day to 15 to 25 mph in the afternoon, creating areas of blowing dust. By tonight those gusts could reach 40 mph in some areas of southwest Imperial County. Temperatures will climb only into the high 60s.

SYNOPSIS FROM THE SAN DIEGO OFFICE

Wind Advisories are in place from 10 a.m. Thursday to 10 a.m. Friday for numerous areas, including but not limited to the San Diego county mountains, the Coachella Valley and the San Diego deserts near Borrego Springs. For the Coachella Valley and Borrego Springs, west winds are expected to be 15 to 25 mph, with gusts up to 40 mph.

Small chances of light showers will continue through early Friday morning. Winds will increase this afternoon and top out this evening before decreasing overnight. Top gusts will reach 45 to 50 mph along the mountain ridgetops and into the adjacent desert slopes. Tonight the winds decrease and the flow turns offshore. That will sweep away the clouds and showers, leaving most of Friday quite sunny. Clear skies will remain with us this weekend under offshore flow. Offshore winds are forecast to get a bit gusty in the foothills during the mornings Saturday and especially Sunday. Lest you think this is a Santa Ana event, it will be drawing in cold air from the western U.S. interior. Temperatures will barely exceed 60 Saturday and 65 Sunday, and that`s for the warmer lower elevations. The mountains will stay in the 30s and 40s. Nights will be quite cold with clear skies allowing heat to escape and sub-freezing temperatures in most parts of the valleys.

SYNOPSIS FROM THE PHOENIX OFFICE
Cool conditions will continue to affect the region through the weekend with several passing weak weather systems. The first will approach today, causing an increase in winds across southeast California and some areas of blowing dust. With respect to the wind today, gusts to around 40 mph are possible over favored higher terrain locations in far SE CA, especially Joshua Tree NP and we have issued a Wind Advisory for the western portion of the park from noon through 11 pm. Areas of blowing dust are also in the forecast this afternoon due to the gusty winds that are expected. That system will pass across Arizona Friday, bringing a few showers mainly to northern Arizona. The weekend looks quite for now, and a slight warming trend is expected early next week before another weather system moves into to the area early next week bringing another chance for showers along with cooler temperatures.
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