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.

October 19 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
WIND ADVISORY FOR IMPERIAL COUNTY

At 2:05 p.m. on October 19, the NWS Phoenix office issued a Wind Advisory for portions of Imperial County.
* AFFECTED AREA…Far southwestern Imperial County.
* TIMING…Late Thursday afternoon through Friday evening.
* WINDS…Sustained 30-40 mph with gusts of 45-55 mph.
* IMPACTS…Motorists traveling on Interstate 8 near the San Diego County border will encounter difficult handling conditions due to very strong winds. There may also be reduced visibility at times due to blowing dust which will make conditions even more hazardous.

SYNOPSIS FROM THE SAN DIEGO OFFICE
A trough of low pressure will move through the West Coast Friday. This will result in a cooling trend through Friday, with a deep marine layer bringing stratus with drizzle or light showers late tonight and Friday from the coastal mountain slopes west to the coast. A Santa Ana wind will develop this weekend and continue early next week and bring hot dry weather along with occasional gusty winds especially through and below passes and canyons. A gradual cooling trend will likely occur Wednesday and Thursday of next week.

SYNOPSIS FROM THE PHOENIX OFFICE
A weak upper disturbance will shift eastward out of Arizona this evening, with drier air overspreading the region from west to east. Winds will increase as a cold front moves eastward tonight and tomorrow, bringing cooler temperatures this weekend. High pressure will rebuild over the region into early next week leading to well above normal temperatures. A weak cold front will move through the region tomorrow afternoon, resulting in increasing westerly winds across the entire area. Sustained speeds around 15-20 mph, with some gusts to 30 mph, across the lower deserts of south-central and southwest Arizona will be possible. Even stronger winds are expected locally across parts of southeast California, and a Wind Advisory has been issued for southwest Imperial County (including a segment of I-8) beginning this evening through late Friday evening. Patchy blowing sand and blowing dust will also be possible mainly across Imperial County tomorrow afternoon. Winds will weaken into Saturday while turning out of the north across the lower Colorado River Valley, as high pressure builds over the Great Basin. Locally gusty winds will still be possible here, while even drier low-level air continues to spread into the Southwest.
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