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.

October 17 2016
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 broad trough of low pressure moving through the West will bring cool weather today. Expect clouds and some showers this morning from mountains westward, and strong winds in parts of the mountains and deserts. The trough will gradually lift out Tuesday and a strong high pressure ridge will build Wednesday and Thursday. Offshore flow also gets going to bring much warmer and drier weather Wednesday through Saturday. Slightly cooler weather and onshore flow will return next week as the ridge weakens.

Some showers have moved into the LA metro area so far this morning. This band will gradually track south and east so that any place from mountain crests to coast will have some chance of showers later this morning. The strong winds in parts of the mountains and deserts will gradually decrease this morning, but continue quite brisk through tonight. This is all brought to us by a strong jet stream shooting through California, the same one that brought a lot of rain to Northern California the last few days. A final weaker wave tracks through the jet early Tuesday, but we will only get some coastal clouds. Offshore flow gets a start on Tuesday, but really gets going Wednesday through Thursday. Fairly strong offshore pressure gradients will drive some strong Sant Ana winds particularly in the coastal foothills Wednesday and Thursday. Some gusts could top 50 mph either morning. Thursday appears to be the warmest day and temps will skyrocket into the 90s for most areas west of the mountains and in the lower deserts; yes, even close to the coast. Winds will back off a bit on Friday into Saturday and the coast will begin to cool off. Over the weekend onshore flow will return as the high pressure ridge breaks down. Mostly clear skies are expected Wednesday through the weekend, although some model guidance suggests increasing tropical moisture wafting northward into California next week.

SYNOPSIS FROM THE PHOENIX OFFICE
Dry weather with mostly clear skies will continue across the Desert Southwest through the weekend. Temperatures will remain above average, however locally breezy conditions will develop Wednesday in the wake of a weak low pressure system passing by to our north.
Weather Story Phoenix Station Weather Story San Diego Station
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