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 11 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 trough of low pressure will settle over the area today through Thursday bringing cooling and higher humidity inland with morning and nighttime clouds from the coast to portions of the inland valleys. High pressure will rebuild late in the week for warmer, drier weather and more Santa Ana conditions over the weekend. Water vapor loop shows a longwave trough over the western U.S.. Some high cirrus cloudiness is seen moving across Southern California, but this will gradually move out to the east this afternoon. Cool, maritime air will move further inland today through Thursday on a westerly wind flow. The marine layer will deepen through Thursday with morning and nighttime low clouds making it into the inland valleys. Little weather changes are forecast for most of the mountain and desert regions. The synoptic weather pattern will change Friday and through the weekend.
SYNOPSIS FROM THE PHOENIX OFFICE
Weak high pressure will bring warmer conditions today with highs in the low to mid 90s across the lower deserts. Temperatures will cool slightly going into this weekend, but will remain near seasonal normals. Dry westerly flow will also result in continued sunny days and clear nights. A rather mundane weather pattern will persist into next week with very little change in sensible conditions across Arizona and southern California. The synoptic pattern will keep a deep trough situated well to the north allowing dry southwesterly flow aloft to remain over the Desert Southwest through the weekend. A slight boost in temperatures will take place today over yesterday as a weak ridge axis exits to the east. After highs in the lower to middle 90s today, the lower deserts will drop back down closer to near 90 degrees by Friday. The troughing to our north will keep temperatures consistent into the weekend under clear to mostly clear skies. The trough will finally exit into the Plains Saturday night into Sunday allowing strong surface high pressure to develop across the Great Basin. This will in turn bring breezy northerly winds across southeast California and southwest Arizona Saturday into early Sunday.
Weather Story Phoenix Station Weather Story San Diego Station
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