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.

January 12 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
SYNOPSIS FROM THE SAN DIEGO OFFICE
A winter storm will bring rain and high elevation mountain snow through this evening. Heavy snow and dense fog will impact the San Bernardino and Riverside County mountains above 6000 feet where a Winter Storm Warning is in effect. Dry most areas Friday, followed by a chance for showers Friday night into Saturday morning, greatest in the mountains and deserts. High pressure will bring dry weather and offshore flow Sunday through Wednesday. Another pacific trough will bring a chance for rain late next week.

Friday will be generally dry with only isolated showers as the atmosphere dries out. Showers will return to the mountains and deserts Friday night into Saturday morning as moisture wraps around the closed upper low over northern Baja. Snow levels will lower to 4000-5000 feet by then. Light showers may spill into the valleys and coastal areas with this upper wave.

Cool over the weekend with northerly flow behind the trough and gusty north winds at times. High pressure aloft builds Monday and Tuesday for minor warming with temperatures close to average. Zonal flow returns next with with an east-west oriented jet over the Pacific bringing rain back to CA. The first chance for rain here in SoCal will be Wednesday night or Thursday

SYNOPSIS FROM THE PHOENIX OFFICE
A large Pacific storm just off the northern California coast Thursday morning, is forecast to deepen straight south the next few days, and into central Baja California by Saturday morning. This weather system will essentially circumnavigate Arizona to the south through the weekend. However, the storms proximity to the region, will spread clouds and a chance of light rain to portions of southeast California, and southern Arizona late tonight through Saturday. Clearing from the west is expected Saturday night, but a few lingering showers will continue over the mountains east of Phoenix on Sunday. Dry weather and slightly below normal temperatures will return Monday through Wednesday.
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