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 27 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
BRIEF DISCUSSION FROM THE PHOENIX OFFICE
Upper air data this morning depict a modest laminar flow from Southern California toward Texas with a vertically stacked low over the Central Plains. Upstream next trough is over Northern California and digging South. Some very modest convection noted with the center of that low per regional radar and CG/CC lightning data. Central objectively analyzed H5 temperature on this system was -25C which while cold isn't exceptionally unusual for late April. Moisture profiles on the 27.12Z RAOBS in the region don't look impressive.

SYNOPSIS FROM THE PHOENIX OFFICE
Another area of low pressure will dip into the area tonight into Thursday with more breezy conditions and an outside chance of showers and thunderstorms most significant over the higher terrain North and East of Phoenix Thursday afternoon. More seasonably warm weather will return for Saturday before yet another weather disturbance potentially impacts the region on Sunday

BRIEF DISCUSSION FROM THE SAN DIEGO OFFICE
This low pressure system will increase clouds and winds this afternoon and evening leading to some showers over and west of the mountains tonight and Thursday. There is also just enough cold air aloft to destabilize the atmosphere for a chance of thunderstorms during the afternoons and evenings today and tomorrow mainly far inland and over the mountains. Showers will be convective and very spotty so amounts will range from nothing to just over a half inch though highest amounts are expected near the mountains and foothills. Snow level will be quite high but a couple of inches could be strongest this evening through Thursday morning along ridgetops and desert slopes of Riverside and San Diego counties. Winds will be generally 20-30 mph with gusts to 550mph locally up to 60mph. Winds will remain breezy through Thursday afternoon but slowly diminish through the day. Fair weather for Friday and Saturday with a coastal eddy at times and areas of night and morning low clouds.

SYNOPSIS FROM THE SAN DIEGO OFFICE
Fair weather will continue today but clouds and winds will increase this afternoon and evening as a low pressure trough moves into Southern California. Showers are possible across the region and strong winds will impact portions of the mountains and deserts tonight through Thursday. Fair weather will prevail Friday and Saturday. Another trough of low pressure will bring a slight chance of showers Saturday night and Sunday morning. Fair and warmer weather will return next week
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