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 10 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
High pressure aloft and weak Santa Ana winds will produce warm and dry weather again today, with locally gusty winds in the coastal foothills and much above normal temperatures in the coast and valleys. Slight cooling Friday and Saturday as high pressure aloft weakens. Night and morning fog may return to the coast as early as Friday night. Another ridge of high pressure aloft and weak offshore flow will create another warming trend Sunday through Monday. A cool-down, increasing onshore flow and a deepening marine layer will then occur Tuesday and Wednesday as a trough of low pressure moves in along the West coast

At the moment, offshore east to northeasterly winds were gusting 30-40 mph, and locally 50 mph, in the coastal foothills. Winds of around this strength should continue this morning before weakening this afternoon, and so a Wind Advisory remains in effect for those locations in Riverside and San Diego counties, and also the San Gorgonio pass. With the aforementioned low near the Texas panhandle moving a little westward today resulting in lower pressure aloft intruding into Southern California, today shouldn`t be as hot as yesterday. Highs in the upper 80s/low 90s for the coast and valleys is expected today, while the lower deserts are in the mid 80s, upper 70s in the high deserts, and 60s/70s in the mountains.

The upper ridge will continue to weaken Friday and Saturday, with the wind pattern becoming neutral to light offshore and a little more cooling occurring across the region. Some night and morning fog could return to the coast as early as Friday night, according to the local WRF.

Another ridge is predicted to build in from the west Sunday and Monday. This, in addition to weak offshore flow, will result in another warming trend on those days. A trough will then move into the Pacific Northwest Tuesday, and deepen across the West on Wednesday, producing increasing onshore flow, a deepening marine layer and cooling trend. Models currently keep most precipitation to our north on Wednesday, with perhaps just some drizzle west of the mountains.

SYNOPSIS FROM THE PHOENIX OFFICE
Upper level low pressure that will be backing westward toward southeast Arizona will bring somewhat cooler temperatures and locally breezy to windy conditions to southern Arizona today through Friday. Southeast California will be under high pressure and experience light winds. A warming trend and continued dry conditions can then be expected from the upcoming weekend into early next week as high pressure rebuilds westward into the Desert Southwest
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