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.

June 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
SYNOPSIS FROM THE SAN DIEGO OFFICE
High pressure aloft will continue hot weather for inland areas through Wednesday followed by slow cooling into next weekend as high pressure aloft weakens and a weak trough of low pressure develops near the California coast. Mid level moisture will bring a slight chance of afternoon and early evening thunderstorms with gusty winds through Wednesday...mainly near the mountains. The marine layer and onshore flow will keep coastal high temperatures cooler with areas of night and morning low clouds and fog

High pressure aloft centered over Utah will strengthen through Tuesday...then begin to weaken on Wednesday. High temperatures for inland areas are expected to peak on Tuesday at 5 to 10 degrees above average...except 10 to 15 degrees above average for the western valleys with high temperatures in the lower deserts around 115...106 in the upper deserts...and 98 to 105 in the Inland Empire. Slow cooling will begin on Wednesday. The marine layer and onshore flow will continue areas of night and morning coastal low clouds and fog extending into the far western valleys. An easterly wave will bring mid and high level monsoonal moisture into Southern California...peaking this afternoon through tonight with the greatest moisture between 400 and 600 mb. Mid and high clouds may keep inland high temperatures today a few degrees lower than Sunday. There is a slight chance of thunderstorms this afternoon and early evening...mainly near the mountains. Given a deep dry cloud cloud layer...any thunderstorms could produce strong gusty winds with the potential for dry lightning as well

SYNOPSIS FROM THE PHOENIX OFFICE
High pressure will move somewhat north and east of Arizona this week allowing warm temperatures to prevail, but also bring a couple of weather disturbances through the state. An increase in monsoon moisture will accompany these weather systems providing a threat of afternoon and evening showers and thunderstorms the remainder of week.

Later in the week the upper high starts to shift towards the southeast and steering flow becomes more southerly. Still, moisture remains high and in fact the GFS calls for PWAT value in the central deserts to approach 2 inches later Thursday into Friday. This would suggest a much better chance for heavy rains to accompany any storms that develop. Of course, as moisture increases the temperatures will fall off and by midweek high temps across south central Arizona will approach and then fall below seasonal normals. It will stay a bit hotter further west where the atmosphere is a bit drier, with highs over 110 expected for much of the week.
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