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.

September 8 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
Slow warming through Saturday with a slightly shallower marine layer, and somewhat less extensive coastal low clouds and patchy fog. For Sunday through Tuesday, a low pressure system moving southward into the California and Nevada will bring stronger onshore flow with cooling, a deeper marine layer, and gusty southwest to west winds in the mountains and deserts. Gradually warmer with weaker winds for Wednesday and Thursday as the trough weakens and exits the region

SATURDAY TO SUNDAY
A weak upper level low pressure system off the northern Baja Coast is expected to move slowly northward to near Point Conception by midday Saturday and into central California Sunday. While it might draw slightly higher precipitable water values of around one inch into far Southern California Friday, it will likely remain too moisture-starved to produce precipitation. Instead, look for a few cumulus build-ups over the mountains during the afternoon.

EARLY NEXT WEEK
For early next week, a stronger low pressure system will move southward through the western states with a closed upper level low forming over California and Nevada by Tuesday and Wednesday. This will bring stronger onshore flow to Southern California, with a deeper marine layer and gusty southwest to west winds in the mountains and deserts. Significant cooling will also accompany this system, with temperatures dropping to around 5 to 15 degrees F below normal for this time of year

SYNOPSIS FROM THE PHOENIX OFFICE
Drier air will begin to move into the region and by Friday, chances for showers and thunderstorms will have moved well east of the area. Moisture will spread back into central Arizona late in the weekend and early next week leading to a persistent slight chance of afternoon showers and thunderstorms. Mostly sunny skies will hold over the far western Arizona and southeast California. Save for above normal temperatures along and west of the Colorado River for the weekend, temperatures will begin to trend at or below seasonal normals through much of next week
Weather Story Phoenix Station Weather Story San Diego Station
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