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.

December 1 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
FIRE WEATHER
Surface high pressure will develop over the Great Basin early next week and strengthen into the middle of the week. Gusty northeast winds will develop near the coastal foothills and below passes and canyons and continue at times through much of the week.

Inland humidity will decrease with periods of very low daytime humidity the middle and latter part of the week. Potential stronger and more widespread winds especially around the middle of the week.

DISCUSSION FROM THE SAN DIEGO OFFICE
TODAY THROUGH SUNDAY
A weak upper level low-pressure system off the northern Baja coast will move east today and tonight with far southern California on the northwestern edge of more substantial mid and high-level subtropical cloud cover.

WEEKEND
A trough of low-pressure will move inland along the West Coast bringing stronger onshore flow to Southern California. Cooling will spread inland through Sunday. The marine layer will slowly deepen with a return of night and morning coastal low clouds and fog. There will also be periods of gusty west winds in the mountains and deserts.

MONDAY THROUGH THURSDAY
High pressure aloft will amplify off the West Coast Monday into Tuesday a trough of low pressure will move southward through the western states. It is unclear to what extent the trough will extend into California. Behind this trough of low-pressure surface high pressure will strengthen over the Great Basin bringing periods of gusty northeast winds to Southern California near the coastal foothills and below passes and canyons.

SYNOPSIS FROM THE PHOENIX OFFICE
Weak low pressure will slowly move south of the region through Saturday bringing continued cloudy skies into early Saturday and maybe some sprinkles. Drier air later this weekend will lead to mostly clear skies while temperatures remain above seasonal normal. Another low-pressure system will affect the region early next week resulting in a bit cooler temperatures, but dry conditions will persist.
Weather Story Phoenix Station Weather Story San Diego Station
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