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 14 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
WIND ADVISORY FOR PORTIONS OF SOUTHEAST CALIFORNIA
WESTERN AND NORTHERN SECTION OF IMPERIAL COUNTY
Northeast to east winds will peak at around 20-35 mph with gusts 50 to 55 mph and isolated gusts 65 to 70 mph

CENTRAL AND EASTERN SECTION OF IMPERIAL COUNTY
Strong, but day, weather system and accompanying jet will create windy conditions along the Colorado River Valley. Breezy north winds by midday with gusts. Strong winds regionally will loft dust/sand and may cause intermittent long-range and slantwise visibility issues through early evening.

RED FLAG WARNING
In effect through Friday morning
Santa Ana winds will strengthen significantly early this morning, first on the San Bernardino County coastal slopes, through and below the Cajon Pass, and into the Santa Ana Mountains/foothills, and then into the Riverside County coastal slopes/passes by 6 am and finally into the San Diego Coastal slopes/foothills by 10 am PST.

Daytime humidity will lower to the 5-8 percent range. The winds will become less widespread Thursday evening but remain quite strong on the San Diego County coastal slopes/foothills. Then, gradually weaken early Friday morning.

SYNOPSIS FROM THE SAN DIEGO OFFICE
Several weak disturbances will dig south over the Great Basin into early next week, squeezing the warm ridge aloft and resulting in periods of Santa Ana winds over SoCal. Continued warm days through Friday, then a bit cooler over the weekend as the marine layer returns briefly. The ridge gradually weakens and shifts a bit more to the west next week, allowing colder systems from the north to enter the picture. They may bring a little rain to northern portions of the state, with noticeable cooling farther to the south as marine air returns.

SYNOPSIS FROM THE PHOENIX OFFICE
A dry low-pressure system from the north will pass through the area today bringing windy conditions to southeast California and far western Arizona. Followed by a second, stronger cold front system over the weekend, which will usher in noticeably cooler daytime temperatures for the weekend along with a slight chance of shower for south central Arizona Sunday, mainly over the higher terrain east of Phoenix. Dry and warmer conditions return for the first part of next week.
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