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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 22 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
There will be a slight chance for thunderstorms in the San Bernardino and Riverside mountains again this afternoon. Otherwise, fair weather will continue through the weekend. Expect coastal low clouds and fog extending locally inland during the nights and mornings, with daytime temperatures near or slightly below seasonal averages. Onshore flow will also bring locally gusty southwest to west winds in the mountains and deserts each afternoon and evening

A low pressure system will move eastward across southern Canada through Thu, with weak troughing extending into southern California. This will cause the weak upper low off the Southern California coast to move east and establish drier northwest flow aloft. This will effectively end the threat of afternoon showers/tstms over the local mtns and deserts for Tue through the end of the workweek. The marine layer and weak onshore flow will continue to bring areas of night and morning coastal low clouds and patchy fog, extending locally inland into the western valleys at times. The onshore flow will also bring locally gusty southwest to west winds in the mountains and deserts each afternoon and evening. High temperatures will be near to slightly below seasonal averages, except several degrees below average in the valleys. A weak upper level ridge of high pressure building in from the southwest could briefly raise temps by a few degrees on Tue and Wed.

Weak weather disturbances will continue the storm chances for today before a downtrend begins Tuesday as drier air moves in. Storm chances Wednesday and Thursday will be limited to the higher terrain of south-central Arizona. An increase of Monsoon moisture is anticipated late in the week but only enough for a modest expansion of storm chances...remaining east of the Lower Colorado River Valley. Temperatures will remain near, to slightly below, seasonal normals
Weather Story Phoenix Station Weather Story San Diego Station
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