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 20 2016
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
Tropical moisture from the remnants of Tropical Storm Paine will bring warm and humid weather today along with intermittent rain. Most of the rain will fall over San Diego and Riverside counties. On Wednesday there will be a chance of afternoon showers and over the mountains and deserts. Breezy and cooler Thursday as a low pressure trough moves inland across the West. Day and warm Friday through Sunday with weak Santa Ana conditions as high pressure builds over the Great Basin

This precipiation shield will remain nearly stationary throughout the day. It extends 100-200 miles south and west of the Mexican border and is moving northeast with only a very slight shift to the north. This will be primarily a stratiform rain event with embedded heavier showers at times over the San Diego and Riverside County Mountains and lower deserts where the atmosphere is saturated from the surface to 20kft. Storm total precip through tonight could exceed 1 inch in some of the mountain and foothill areas. Farther northwest the lower layers remain fairly dry and very little if any rain will fall over Orange County and San Bernardino County.

SYNOPSIS FROM THE PHOENIX OFFICE
Tropical moisture will continue to move into the region today through Wednesday, resulting in mostly cloudy skies and a chance of rain. Rainfall is expected to stay on the light side, with locally moderate amounts at times. On Thursday, a strong and relatively cold low pressure system will plunge into the western states from the north, including parts of northern Arizona. Behind Thursdays cold front, a drier airmass will spread into southeast California and southwest Arizona, with a continued threat of showers over the eastern half of Arizona. Much drier air with clear skies will move in on Friday through Sunday
Weather Story Phoenix Station Weather Story San Diego Station
Image for Phoenix Station Weather Story Image for San Diego Station Weather Story

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