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.

November 18 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
After a chilly morning with some frost in the high desert, dry offshore flow and plenty of sunshine will bring a warmer day today. Areas of gusty east winds in the foothills this morning will gradually decrease. Patchy frost will return in parts of the high desert tonight. A low pressure trough moving into Southern California on Sunday will bring cooler onshore flow, more clouds, and showers late Sunday through Monday. Fair and warmer weather will follow Tuesday into the holiday.

Offshore flow has easterly winds blowing in foothill areas and some valleys and mesas this morning. But where the wind is calm, like in the high desert, it`s downright chilly with temps dropping into the freezing range. Lots of sunshine and very dry air will quickly warm up things today into the 70s for the lower elevations. The dry and calm air will allow frost to develop in the colder pockets of the high desert again tonight. High pressure aloft builds a little today into Saturday and that will bring us a couple warm days as the offshore flow diminishes. A big low pressure trough in the Pacific will spin off a shortwave trough that barrels right into Southern California on Sunday. Ahead of the trough southerly winds will transport some tropical moisture into our region which will bring us thickening high clouds that will gradually lower on Sunday. Sprinkles or isolated light showers are possible during the day. A more organized band of precipitation appears to track through our region Sunday evening through Monday morning

SYNOPSIS FROM THE PHOENIX OFFICE
High pressure building back eastward into the Desert Southwest will bring a warming trend starting today into this weekend with highs climbing back into the upper 70s to lower 80s on Saturday and Sunday. A wet weather system will then bring unsettled and cooler conditions to the region beginning Sunday night. Widespread rainfall is likely, especially across Arizona where rainfall amounts may exceed one inch across higher terrain locations in south-central Arizona. Dry conditions will then return to the region from Tuesday onward into the middle part of next week as high pressure rebuilds
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