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 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
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES...

High clouds are on the decrease while coastal low clouds are on the increase this morning. Skies will be partly cloudy today as a low pressure trough moves through California to our north. This will bring cooler weather and wind, but not precipitation. Winds in parts of the mountains and deserts will gust over 50 mph this afternoon through tonight. As the trough moves out Thursday, dry northwest flow will keep our weather fair but on the cool side through Saturday. Then things get interesting. A cutoff low pressure system in the ocean a long way west of San Diego will grab some subtropical moisture from southern latitudes. A separate low pressure trough coming down the coast will grab and absorb that southern system and move into Southern California. This will bring a relatively warm rain event Sunday into Monday morning. It will also bring some brisk winds to all areas. The trough will move fully into Southern California Monday bringing colder but drier air with it. That will mean steady precip will turn to showers, and in the mountains rain will turn to snow showers. Of course there are differences in model solutions, but it appears the showers will end Tuesday morning. Over the next few days we will get a better focus on the details of timing/amount of precipitation and strength of winds so stay tuned. It looks like a high pressure ridge develops by midweek to start off March dry and warm

SYNOPSIS FROM THE SAN DIEGO OFFICE
A low pressure trough moving through California today will bring cooler and partly cloudy weather and areas of strong winds in the mountains and deserts. Mostly clear skies will follow Thursday and Friday, but it will continue cool. A storm is currently forecast to bring rain and wind Sunday into Monday, with showers continuing into Tuesday

SYNOPSIS FROM THE PHOENIX OFFICE
The above normal temperatures will abruptly come to an end on Thursday as a dry cold front ushers in a substantially cooler air. The dry and cool conditions will persist through much of the weekend before an approaching Pacific low pressure system brings increasing clouds and a return to unsettled weather for early next week.
Weather Story Phoenix Station Weather Story San Diego Station
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