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.

September 19 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
MOUNTAIN/DESERTS
Clear today and tonight. Local west wind gusts 28-40 mph along the desert slopes and through San Gorgonio Pass late afternoon through evening.

SAN DIEGO OFFICE - DISCUSSION
Early this morning the marine layer is near 3000 to 35oo feet deep with widespread stratus extending into the far inland valleys and into the Banning and Cajon passes.

A low pressure system centered along the British Columbia coast will move southward along the West Coast through Thursday and Friday then weaken for the weekend into early next week as high pressure aloft strengthens off the West Coast.

Onshore flow will strengthen further for Wednesday afternoon through Thursday night with period of strong gusty west winds from the mountain ridge tops into the deserts. There could be gusts to around 65 mph in the windier locations with strongest winds for Thursday afternoon and evening.

For next week -
High pressure aloft will strengthen off the West Coast this weekend with surface high pressure developing over the Great Basin early next week. This will bring a warming trend with high temperatures near to a little above average early next week. Period of locally gust northeast winds are possible near the coastal foothills and below passes and canyons early next week.

FROM THE PHOENIX OFFICE
Dry air over the Southwest will persist through Wednesday as temperatures remain near seasonal normals across southeast California and southern Arizona. A strong expansive area of low pressure will develop over the Western United States during the latter part of the week bringing cooler temperature, breezy conditions, and the chance for showers and a few thunderstorms to eastern portions of Arizona for Thursday and Friday. Well below normal temperatures and dry conditions will move in across the region this weekend.
Weather Story Phoenix Station Weather Story San Diego Station
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