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 31 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 will slowly weaken through Thursday with slow cooling...followed by greater cooling for Friday through Labor as a trough of low pressure develops near the West Coast with high temperatures 5 to locally 10 degrees below average in portions of the valleys. Night and morning coastal low clouds and patchy fog will extend farther into the valleys for Friday through Labor Day. High pressure will then bring warming to near average for the middle of next week

A trough of low pressure over the Eastern Pacific will move slowly towards the West Coast through Thursday...moving into the Pacific Northwest on Friday. This will bring a slow cooling trend for Southern California with inland high temperatures falling from around 5 degrees above average on Tuesday...to a few degrees below average on Friday...except locally 5 to 10 degrees below average in portions of the valleys

SYNOPSIS FROM THE PHOENIX OFFICE
High pressure in the eastern Pacific will result in above normal temperatures today and less so Thursday, particularly across southeastern California. Meanwhile, humidities will increase across the region peaking late Thursday. Afternoon thunderstorms will continue over the mountainous areas with at least slight chances for storms to affect the lower deserts today and Thursday mainly east of the Lower Colorado River Valley. A drying trend slowly starts Friday and continues and into early next week as a low pressure system moves through the western states. Resulting temperatures will be below seasonal normals both in terms of daytime highs and overnight lows

Friday through Tuesday... The West Coast will be fully enveloped by Pacific troughing Friday and into the weekend that will move into the Intermountain West Saturday-Sunday. Resulting southwesterly ML and westerly UL flow will vastly reduce any remaining moisture throughout the region, dropping area PWATs 0.50" or lower by Sunday. Lack of strong frontal feature or thermal advection will allow for this trough transition into the area to pass rather quietly, drawing down area dewpoints and support minimal daytime convective activity over the far eastern Arizona mountains. Dry advection and lowering heights through the column will also support a larger diurnal temperature range. Daytime highs will hold at or below seasonal normals and the morning lows will be rather refreshing, with widespread 70s for the lower desert elevations by Sunday AM and lingering into the work week.
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