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 21 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
Light showers will continue to taper off this morning over portions of San Diego and Riverside Counties. A few showers and thunderstorms are expected in the mountains and parts of the desert this afternoon. A low pressure trough will bring breezy and cooler weather Thursday. High pressure and offshore flow will build this weekend and bring clear skies and dry warmer weather through early next week

The deep subtropical moisture will gradually thin out today, but clouds won`t clear too quickly or fully. It will be warmer and sunnier than yesterday and still muggy. The chances of showers and thunderstorms will be primarily in the mountains and adjacent deserts this afternoon. It sounds counterintuitive, but the better chance of showers and thunderstorms this afternoon will depend on fewer higher clouds to allow sunshine to heat the surface and generate convection.

SYNOPSIS FROM THE PHOENIX OFFICE
Tropical moisture from former Hurricane Paine will continue to move into the region from the south through Thursday. There is a slight chance of showers today and tonight. A strong cool Pacific low pressure system is forecast to plunge into the western states on Thursday. A cold front moving through Arizona will gather and push the deep tropical moisture eastward across central Arizona, with a good chance of afternoon thunderstorms Thursday afternoon and evening. A much drier airmass will spread across Arizona Friday through early next week, resulting in clear skies and below normal temperatures
Weather Story Phoenix Station Weather Story San Diego Station
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