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 4 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
A return of onshore flow will bring a slow cooling trend through Sunday with a return of night and morning coastal low clouds and fog for the weekend into Monday. Slowly warmer for Monday through Friday of next week with periods of mostly weak offshore flow for Tuesday through Friday.

High pressure aloft will restrengthen across the southwest states with surface high pressure over the Great Basin bringing periods of mostly weak offshore flow beginning Tuesday. Patchy coastal low clouds and fog will continue near the coast into Monday morning before the weak offshore flow develops. There will be a slow warming trend for Monday through Thursday. Otherwise...there will be a few high clouds at times.

SYNOPSIS FROM THE PHOENIX OFFICE
A low pressure system that was located along the south central Arizona border on Thursday, will track northeastward across the state today. Scattered showers and thunderstorms are forecast across most of eastern Arizona through this evening. Clearing skies are forecast later tonight, with mostly clear skies and warmer temperatures expected this weekend through the end of next week

The cutoff low will continue to move northeastward today, with the 500 mb low center near Payson around noon, then near Show low this evening. Most upper level support for showers and thunderstorms today will be confined to mountains northeast through east of Phoenix, with most precip in our forecast area focused over southern Gila County. However, the upper lows cyclonic circulation, as it pulls away from the deserts near Phoenix, will likely circulate cloudiness and dissipating mountains showers, i.e. convective debris cloudiness, back into portions of the greater Phoenix area from the north and northeast. Although precip probabilities will remain elevated for southern Gila County, lower probabilities will remain over the northern and eastern portions of the greater Phoenix area closest to the mountains. Otherwise the remainder of the forecast area, including southeast CA and southwest AZ, will be partly cloudy and dry. Additionally, showers drifting off the mountains north through northeast of Phoenix could create some gustiness at times this afternoon and evening, i.e. sudden wind gusts to 30 mph
Weather Story Phoenix Station Weather Story San Diego Station
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