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.

August 18 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 slight cooling trend begins today, most notable near the coast and into the western portions of the valleys, where temperatures will moderate as much as 10 degrees cooler compared to Thursday afternoon. Gradual cooling will continue through the weekend, with temperatures lowering to near normal. The marine layer will slowly deepen through the weekend so that coastal low clouds spread progressively farther inland during the nights and mornings. Small amounts of monsoonal moisture could trigger a few afternoon and early evening thunderstorms over the mountains and desert slopes today and Friday, but the chances are slim

The residual moisture over the mountains, quite thin centered around 600 mb, will nonetheless contribute to the potential for a few more thunderstorms over the higher mountains and along the desert slopes, this afternoon and early evening and again Friday. Due to marginal moisture parameters, heavy rainfall is not likely with storms that do form.

Further cooling will take place Friday into the weekend due to gradually lower heights as well as a continued substantial marine layer influence near the coast. Stratus will be slower to clear the beaches this weekend

SYNOPSIS FROM THE PHOENIX OFFICE
Temperatures will trend cooler for the remainder of the week, however remain in a slightly above normal category. Modest moisture levels will persist into the weekend with occasional spotty thunderstorm chances. The primary threats from any of these storms will be gusty winds, patchy blowing dust, and very isolated heavy rainfall.

There has been some more definitive response in operational models showing a better organized synoptic wave sweeping through the forecast area in the strong westerly flow early next week. This may finally act to scour the residual moisture east and place much of the region into subsident NW flow into the middle of next week. Given some uncertainty in timing and orientation of such a wave, could not completely eliminate rainfall chances though kept the mention to a minimum
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