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.

April 7 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
A Pacific low pressure system coming up from the subtropical regions west of southern Baja will slowly move into southern CA and southwest AZ this afternoon...then spread across the remainder of AZ tonight and Friday. A chance of showers will develop in southeast CA later today...then spread into south central AZ including the Phoenix area tonight and early Friday. Rain chances will taper off from west to east Friday afternoon...but a good chance of mountain thunderstorms will remain over central and eastern AZ.

A series of Pacific storms are forecast to periodically move into the region late today through Monday night and bring a chance of rain to the region. However the pattern is complicated and timing of the second two systems Saturday night and Monday night may be off by several hours. Otherwise the storm track is forecast to develop over the region for much needed rainfall.

Light showers this morning then increasing showers this afternoon. Highest rainfall totals for this system will be in mountains and deserts.

For extreme southwestern California including Orange, San Diego, western Riverside and southwestern San Bernardino counties. A new weather pattern has begun. In the coming week we will have some chance of showers each day. A low pressure trough to our south will continue to approach and spread a thicker layer of clouds over our region today. As the clouds thicken and lower during the day the chance of measurable rain will increase proportionately. Sprinkles are the most likely outcome for today in most areas but a better chance of legitimate showers comes late today into Friday and the best chance of a measurable shower happens to be in the mountains and deserts for this system. No snow except for the highest mountain peaks. Without much sun temps will be way down from what they were yesterday as much as 20 degrees lower in some areas. The trough slowly moves south to north through our region and temporarily the chance of showers diminishes late Friday and Friday night. The next system is a deeper more intense trough moving into southern California from the west. This one has more cold air and organization. Showers are possible Saturday morning but the main band of rain along with some thunderstorms will wait for the afternoon and evening. There will be some gusty winds along with several inches of snow in the mountains above 6000 feet. That storm will move out on Sunday. But before we can even dry out here comes the next storm which looks weaker on Monday. Not as much rain snow or wind. Just expect some showers Monday and Tuesday. The moisture lingers into Tuesday but Wednesday is beginning to look mostly dry. Maybe only mountain showers then.
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