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.

November 17 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
Fair and cool weather is expected today with some offshore flow. Areas of northeast winds will be strong through this morning in the northern Inland Empire, inland Orange County, and northern Coachella Valley. Patchy frost is expected in the High Desert early Friday morning. Fair and warmer weather will follow Friday and Saturday under a weak high pressure ridge. A low pressure trough will bring a chance of showers Sunday and Monday. Fair weather will follow Tuesday and Wednesday

Winds are making a turn from those strong westerly winds last evening into areas of strong northeast winds this morning. Skies are clearing out on schedule with the southward push of drier air coming off the high desert. The offshore pressure gradient and 850 mb winds will drive these winds, which will be strongest from Cajon Summit through the northern Inland Empire and into inland Orange County. The northern Coachella Valley will get the winds too, mainly north of I-10. Local gusts in these areas will exceed 40 mph. These winds will decrease this afternoon. It will be fair and warmer today, but the new air mass is quite chilly and dry, so as winds calm down tonight for most areas efficient radiational cooling will make for a chilly night, and even create patchy frost in parts of the high desert. The offshore pressure gradients continue tonight into Friday, but turn into a more easterly configuration. That means brisk easterly winds will continue in pockets of foothills of Riverside and San Diego Counties. Some high pressure aloft builds Friday and Saturday so temperatures will rebound nicely into the 70s for most lower elevations. A huge trough of low pressure over the northeast Pacific will approach the West Coast and split in two over the weekend. A shortwave on its west side will dip south and move into Southern California late Sunday and Monday. It has enough moisture with it to bring showers, and it will also draw up some tropical moisture to add to the mix. However, models are still not coming together very well on the exact timing and position of this low. Expect some increasing and thickening high clouds on Sunday and some showers Sunday night through Monday, although not much wind. That system quickly moves east Monday night, but there`s not much rebound in high pressure. A general weak long wave trough pattern will continue as we head into the holiday with seasonal temperatures and dry weather.

SYNOPSIS FROM THE PHOENIX OFFICE
A low pressure system will exit the region today leaving much cooler temperatures and breezy conditions. moving through the western states through Thursday. The coolest morning so far this month will occur on Friday morning with widespread lows in the 40s. A warming trend is expected over the weekend. A much wetter and potent weather system will bring unsettled conditions Sunday night and Monday. Widespread rainfall is likely, especially across Arizona where rainfall amounts may exceed one inch across south-central and southeast Arizona
Weather Story Phoenix Station Weather Story San Diego Station
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