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 13 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
Onshore flow and an upper level trough will bring areas of low clouds west of the mountains this morning, followed by sunny skies this afternoon. Temperatures will heat up and humidity will plummet west of the mountains this weekend as Santa Ana winds develop over parts of the Inland Empire and adjacent mountains and inland Orange County. Winds will relax on Monday, but ridging aloft will take over with temperatures continuing above average through Tuesday. A trough will approach from the west during the middle to latter part of next week, lowering temperatures and resulting in gusty westerly winds for the mountains and deserts.
Surface high pressure will be settling in over the Great Basin behind an upper level trough moving across the Rockies through Saturday. This will result in an offshore pressure gradient with winds turning out of the northeast/Santa Ana wind developing. The offshore winds do not look strong enough though to prevent a sea breeze from developing and this will keep the beaches much cooler with even the possibility of marine layer stratus near the coast Saturday morning.

FROM THE PHOENIX OFFICE
High pressure will persist across the region through the middle of next week allowing for continued warm and dry conditions. Under mostly clear skies, high temperatures for lower desert communities will generally reach into the lower and middle 90s. Somewhat cooler weather with more cloud cover will arrive by the end of next week. A sharpening wave ejecting into the Great Basin Saturday will force a weak cold front into Arizona and support more robust post frontal surface pressure rises. This will result in some gusty winds through the lower Colorado River valley; but with minimal height falls and a limited thermal gradient, this frontal passage doesn`t appear to have major widespread impacts on the region.
Weather Story Phoenix Station Weather Story San Diego Station
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