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.

August 21 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 weak low pressure system off the Southern California coast will keep high temperatures a few degrees below average today. Mid level monsoonal moisture to the east and north will bring some afternoon clouds to the mountains with a slight chance for thunderstorms for the San Bernardino County mountains and adjacent deserts this afternoon.

The low pressure system will remain off the central and southern California coast through Tuesday then slowly weaken and move inland Wednesday and Thursday with a trough of low pressure moving inland through the Pacific Northwest and northern Rockies Thursday. High pressure aloft will develop over Arizona Friday then shift northward and be centered over the Great Basin for Sunday and Monday.


SYNOPSIS FROM THE PHOENIX OFFICE
The Phoenix weather office discussion indicates that radar shows a few showers across western Arizona and southeast California with little if any actually reaching the ground due to dry conditions at the surface.

Looking at the large scale pattern, the NWS office in Phoneix is tracking a 500 mb low off the west centered just off the coast of Southern California. Models indicate the low expanding eastward turning the easterly flow to a southwest flow today, August 21, 2017. The southwest flow is expected to continue into Tuesday keeping the few potential monsoonal storms that do develop confined to the higher elevation of Gila County.

By Wednesday the trough is expected to continue to gradually advance eastward all the while a high pressure center over northern Mexico rotates up. Behind the trough, drier air will limit convection to the higher terrain of Gila County Arizona
Weather Story Phoenix Station Weather Story San Diego Station
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