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.

January 20 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
A strong Pacific storm will bring periods of rain, heavy at times, strong winds, mountain snow and a chance of thunderstorms this afternoon into this evening, tapering off gradually late tonight and Saturday. Flooding will be possible in some areas. A brief dry period will occur late Saturday through early Sunday before the next storm bring more heavy rain, strong winds, mountain snow with another chance of thunderstorms and flooding. Showers will linger Tuesday, with fair weather likely starting Wednesday. Temperatures will average below normal through the middle of next week, then increase some the second half of next week.

The break in the precipitation should occur late Saturday through very early Sunday morning, though a lot of clouds will likely linger due to moisture both below 850 MB, helped by the wet ground, and some moisture above 600 MB. The next storm will move from northwest to southeast Sunday through Monday and bring substantial rainfall again along with strong winds and a possibility of thunderstorms. Strong warm air advection in the 850-700 MB layer will bring the snow levels up to 7000 feet or higher Sunday, so this will cut back on snowfall amounts, and high humidity in the mountains will cause some snowmelt to occur, in addition to the rain. There will definitely be a flash flood threat Sunday through Monday, especially as soils will be saturated. Cold air comes in behind a front Sunday night, so snow levels will fall to 3500-4000 feet Monday and continue Tuesday under a broad cold low pressure system. This could result in substantial snow accumulations as saturation reaches 500- 600 MB at times. Fair weather will not return until at least Wednesday, but models are consistent at showing a high pressure ridge late next week for fair warmer weather.

SYNOPSIS FROM THE PHOENIX OFFICE
A series of Pacific storms will move into the region over the next few days. The strongest and wettest storm will affect the region tonight through early Saturday. Snow accumulation will be above 5500 feet. A Winter Storm Warning is posted for the mountains east of Phoenix through Saturday afternoon. A break in the weather is expected Saturday night and early Sunday, however another Pacific storm is expected into the region later Sunday through next Tuesday. Dry but cool weather will settle over the region for the middle of next week.
Weather Story Phoenix Station Weather Story San Diego Station
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