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 20 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
WIND ADVISORIES
WESTERN AND NORTHERN SECTION OF IMPERIAL COUNTY
Westerly winds after 1100am, 17 to 34 mph with gusts 50mph along the mountain slopes and deserts.
Wind advisory issued for Coachella Valley, Riverside County Mountains, San Diego County deserts, San Diego Mountains and the San Gorgonio Pass near Banning.

CENTRAL AND EASTERN SECTION OF IMPERIAL COUNTY
Very light winds through Wednesday morning will eventually become southerly, then westerly into Wednesday evening. A cold front will bring gusty northwest winds this evening causing potential reduced visibility due to blowing dust and sand Wednesday night through Thursday.

FIRE WEATHER
Surface high pressure over the Great Basin will bring a period of moderate offshore flow for late tonight into Thursday night. The stronger winds expected for late tonight into early Thursday afternoon with the lowest humidity late Thursday morning through Thursday afternoon.

The most critical fire weather conditions expected for late Thursday morning into Thursday afternoon along the lower coastal slopes of the mountains of San Bernardino and Riverside Counties in the Inland Empire below the Cajon and Banning Passes and for inland Orange County.

SYNOPSIS FROM THE SAN DIEGO OFFICE
A low-pressure system moving into the Great Basin today will bring stronger onshore flow with cooling, more clouds and strong gusty west winds in the mountains and deserts. A weakening cold front will move through Southern California late this afternoon into this evening with a chance of light showers along and west of the mountains.

A period of moderate Santa Ana winds will follow for Thursday with gusty north winds along and below coastal mountain slopes of San Bernardino, Riverside and Orange Counties. Nights will be cooler with patchy frost in portions of the inland valleys late tonight into Thursday morning and areas of frost for late Thursday night into Friday morning. Dry with a warming trend for Saturday through Christmas with weak offshore flow.

SYNOPSIS FROM THE PHOENIX OFFICE
Slightly above normal temperature forecasted today before a cold front moves through the region late Wednesday and Thursday, with strong winds developing across southeast California. Much cooler temperatures expected area-wide Thursday and Friday. A warming trend will occur through the weekend as high pressure rebuilds over the Pacific Coast.
Weather Story Phoenix Station Weather Story San Diego Station
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