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.

June 23 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 continue to bring above average temperatures through Saturday. Night and morning marine layer clouds will retreat back to the coast each afternoon. Hot weather returns again early next week as the high aloft strengthens over the Four Corners region. Weak monsoonal flow could bring a few thunderstorms to the mountains next week

The quasi-stationary ridge that has held strong over the Southwest since late last week will briefly be flattened by an unusually strong low moving into the Pacific Northwest. A small decrease in 5h, a slightly deeper marine layer, and a modest increase in onshore flow will support a few degrees of cooling today. Greatest cooling will be west of the mountains due to the deeper marine layer.

On Saturday the ridge will rebuild over the Southwest, and by Sunday it will have regained its dominant foothold over the Southwest with a 595 DM high centered over the Four Corners region. This will bring back another period of hot weather Sunday through Tuesday when temperatures will approach Heat Advisory or Heat Warning criteria over the Deserts, Mountains and Inland Valleys.

The models are also hinting at monsoon flow making it into Southern California around the western periphery of the upper ridge beginning Monday. The ECMWF is a little farther north with the center of the high over Utah, and this position is a little more favorable for monsoon moisture to reach our area. PWATS are projected to increase to 1+" on Tuesday and Wednesday when isolated/scattered thunderstorms may form over the mountains. Thunderstorm chances would be greatly enhanced by any easterly wave, one which is advertised by the ECMWF early next week.

SYNOPSIS FROM THE PHOENIX OFFICE
A very warm air mass will maintain above normal temperatures through the first half of next week. A gradual increase in moisture is likely to affect portions of Arizona leading to a threat for showers and thunderstorms initially to high terrain areas and then finally to the lower deserts starting Sunday or Monday
Weather Story Phoenix Station Weather Story San Diego Station
Image for Phoenix Station Weather Story Image for San Diego Station Weather Story

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