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 10 2017
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
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES...

ACCAS clouds formed over the mountains and deserts this afternoon, a sign of mid-level instability. Further growth today will be inhibited by the lack of deep moisture, but mid-level moisture advection over the next 24-48 hours may be enough to support CBs large enough for isolated to scattered afternoon t-storms over the mountains Friday and Saturday. A surface based moisture surge reached into the southern Coachella Valley this afternoon, and a stronger surge is forecast tonight into Friday morning when dew points will likely reach into the low 70s.

The dry airmass that was in place over the mtns this morning is not quite as dry this afternoon. Winds aloft shifted southeast and started pulling in the monsoon moisture over AZ and northern Mexico.

The stronger upper level dynamics with this event stay over AZ and the Lower Colorado River Valley where an easterly wave will interact with deeper moisture for greater t-storm coverage there.

SYNOPSIS FROM THE SAN DIEGO OFFICE
A surge of monsoon moisture will bring higher humidities and a slight chance for afternoon thunderstorms over the mountains Friday and Saturday. It will be hot in the Inland Empire Friday, then not quite as hot over the weekend. Night and morning low clouds will clear back to the coast each afternoon.


SYNOPSIS FROM THE PHOENIX OFFICE
Increasing southerly flow aloft is bringing increasing amounts of monsoon moisture back into the region. Accordingly, storm chances are returning back to the lower deserts of Arizona and expand into much of southeast California by Saturday. With higher humidity and more cloudiness, high temperatures will trend downward as well. A drying trend begins from west to east on Monday
Weather Story Phoenix Station Weather Story San Diego Station
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