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.

May 25 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 PHOENIX OFFICE
A large region of low pressure will continue over the Western States through the weekend bringing overall cooler than normal temperatures and dry conditions. A more compact low pressure system will move through today bringing gusty winds to much of the area. Building high pressure for next week will likely bring a warming trend pushing highs to near 100 degrees for the lower deserts by the middle of next week

Models, including GEFS ensemble members, remain in good agreement that dry weather with continued below seasonal normal high temperatures will continue into the weekend under the influence of large scale upper troffing that has been persistent across the western CONUS. Water vapor imagery at 2 am showed an upper closed low spinning just off the far SE California coast, and progs continued to call for the low to eject inland into far southern CA later today, then move northeast and across Arizona overnight tonight. This will be a moisture starved system with PWAT values mostly below one half inch, with most of the moisture confined to mid or high levels. Despite rather strong UVV and mid level Q-convergence fields associated with the low, it will simply be too dry to allow for any measurable precipitation, and for the most part there will not be much in terms of cloudiness.

SYNOPSIS FROM THE SAN DIEGO OFFICE
Today will be breezy and cool with a low pressure trough moving through Southern California. Light showers are possible in the coastal basin this morning with isolated thunderstorms mainly in the mountains this afternoon. Cool weather with a deep marine layer will continue this week, but slightly warmer for the holiday weekend

A few showers have developed within our deep and convective marine layer this morning. This is in response to a low pressure trough advancing into Southern California. This system has little moisture to add to the marine layer, but will squeeze out some light showers in the coastal basin this morning. It will also bring colder air aloft this afternoon that will coincide with maximum heating of the surface. This will create enough unstable energy for a few thunderstorms today. These are expected mainly over the mountains, but it`s not out of the question for far inland valleys too. Strong winds will develop in the mountains and deserts. Local gusts will exceed 40 mph and could produce pockets of blowing dust in the desert. The trough exits east tonight and takes the precip threat with it.
Weather Story Phoenix Station Weather Story San Diego Station
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