AIR POLLUTION
CONTROL DISTRICT

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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 25 2018
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
IMPERIAL COUNTY
Very weak offshore flow will develop for today, then strengthen slightly for tonight into Wednesday. There will be locally gusty east winds in the mountains today with gusts mostly less than 25 mph. The winds are expected to be more widespread for late tonight into Wednesday morning in the mountains, below passes and canyons, and in the far inland valleys near the coast foothills. Winds are expected to gust to around 25 mph at times.

Most of the county will experience north to northwest winds of 5 to 15 mph, while east to southerly winds of 5 to 15 mph will be across the east and southeast portions of the county.

SAN DIEGO WEATHER OFFICE
Strengthening high pressure aloft and very weak offshore flow will bring a warming trend through Thursday, followed by a cooling trend for Friday into next weekend. The marine layer will become shallower for Wednesday and Thursday with night and morning coastal low clouds and fog not spreading as far inland. A trough of low pressure may develop off the California coast for Sunday into early next week. There is some potential for this trough to draw some tropical moisture into portions of the southwest states for early next week with very low confidence in the details.

MONSOON UPDATE
From NWS Phoenix: A complex scenario is shaping up for this weekend into early next week after the Pacific Low off the West Coast opens up and the main low center moves ashore into northern California Saturday night. Things get complicated when we may have to worry about a tropical system (Tropical Depression Twenty-E) potentially approaching from the south southwest Sunday into Monday.

PHOENIX WEATHER OFFICE
Warm and overall dry conditions will last into the early weekend as temperatures continue to hit several degrees above average each day. A couple of very weak weather disturbances today and Wednesday may allow for a few showers across the higher terrain of eastern Arizona. A Pacific low pressure trough in combination with some potential for tropical moisture affecting the Desert Southwest will bring a return of chances for showers and thunderstorms Sunday night into early next week.

MEXICO WEATHER OFFICE
The very active tropical wave No. 39 will travel south, center and west of Mexico, while the Tropical Depression "Twenty-E" will be located southwest of the coasts of Colima and Jalisco; both systems will favor abundant inflow of humid and unstable air into the interior of the country. On the other hand, large areas of higher instability will affect the northwest, south and southeast of the national territory. The aforementioned systems will cause the following rain potentials, which will be accompanied by electrical activity and possible hail.
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