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 15 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 FOR PORTIONS OF SOUTHEAST CALIFORNIA
WESTERN AND NORTHERN SECTION OF IMPERIAL COUNTY
Northeast winds 15 to 25 mph with peak gusts 40 to 50 mph will continue along the coastal slopes and foothills through about 10 am PST then diminish through the afternoon. The strongest winds expected in San Diego County this morning. Much calmer winds today, maintaining north-northeast at Blythe with speed generally low.

CENTRAL AND EASTERN SECTION OF IMPERIAL COUNTY
Winds at Imperial Airport will stay light and mostly variable in nature. Skies to remain mostly clear through the early evening, before mid-level clouds begin to thicken and increase from west by Saturday morning.

RED FLAG WARNING
In effect through 10am for inland areas
The winds, coupled with RH vales below 15% will continue Red Flag conditions in inland areas.

A sea breeze of 8-15 mph will develop into the valleys later this afternoon, but except for the coastal strip, RH will remain below 15%. Stronger onshore flow and higher RH will bring a respite to the elevated wildfire conditions west of the mountains on Saturday. Westerly winds of 15 to 30 mph with gusts to 45 mph will develop over the ridges and onto the desert slopes.

A Fire Weather Watch has been issued for the possibility of another strong offshore event with RH values of 15% or below. The latest forecast information suggests the stronger winds and larger fire weather threat would be in areas north of San Diego County.

SYNOPSIS FROM THE SAN DIEGO OFFICE
The strong high-pressure ridge over the eastern Pacific will remain in place through next week. A disturbance will drop south along the eastern side of the ridge on Saturday, briefly drawing moist, marine air back over the region and setting up a cooler weekend. As it passes to the southeast, the dry offshore winds will return on Sunday into Monday. Not quite as warm next week, but continued fair and dry with above average temperatures.

SYNOPSIS FROM THE PHOENIX OFFICE
Quiet weather expected today and most of Saturday before the next weather system moves in. This one is looking a bit stronger, chances for rain and mountain snow now in the forecast for the eastern half of Arizona Sunday and into early Monday. Temperatures will also be quite cool with this system, likely bringing the coolest temperatures of the winter so far. Tuesday and beyond will see a return of dry and gradually warming weather.
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