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.

December 30 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
A couple of storm systems will bring precipitation at times through Saturday night. The first system will bring occasional rain showers to the region today with a slight chance of thunderstorms. After some lingering showers tonight, a colder system will bring more precipitation Saturday and Saturday night with snow accumulations in the mountains. Gusty winds will occur at times in the mountains and deserts Saturday afternoon through Sunday. Partly cloudy and cool conditions will prevail most of next week with periodic chances of mostly light precipitation due to a low pressure trough over the West. Abnormally cold weather may develop later next week over the mountains and high deserts.

A vigorous S/W trough currently over the PacNW will drop due south on Saturday and deepen into a closed low as it spins just off the California coast. There will be some light showers Saturday morning at times, mainly west of the mountains, in advance of the cold low. Moisture advection is looking a little better with this system and have bumped up both pops and QPF for much of our area, predominantly late Saturday afternoon through Saturday evening. Cold core system will bring the threat of thunderstorms and briefly low snow levels Saturday evening...this will likely affect the busy interstate passes as well as bring some heavy bursts of precip to the lower elevations. Weekend holiday travel impacts are a concern given this fast moving vigorous system.

Precip will quickly come to an end early Sunday morning as the low passes to SE. There will be some minor transitory ridging on Sunday so we expect a brief dry spell. Then Monday through midweek we will be under a broad trough and strong u/l flow. Some weak embedded upper level waves in the flow could bring some periods of light showers Monday through Wednesday night

SYNOPSIS FROM THE PHOENIX OFFICE
Anticipate warmer conditions today with highs topping 70 degrees across some area desert locations. Unsettled weather is then expected tonight through Sunday with two weather systems affecting the region. The first low pressure system will bring best chances for rain tonight into early Saturday. The second colder system will move in Saturday night with cooler air moving into the region starting Sunday. Rain will be likely Saturday night and Sunday morning with lingering showers across eastern Arizona Sunday afternoon. Mostly dry but continued cool and somewhat unsettled conditions are likely for much of next week.
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