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.

July 11 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 low pressure system moving inland through the Pacific Northwest will maintain high temperatures slightly below average through Tuesday. High pressure to the south will bring warming to slightly above average for Wednesday and Thursday. Another low pressure system near the West Coast will bring a cooling trend for Friday through next weekend with high temperatures falling to slightly below average. The marine layer and onshore flow will continue areas of night and morning coastal low clouds and patchy fog extending into portions of the western valleys at times

A low pressure system moving inland through the Pacific Northwest will maintain high temperatures slightly below average through Tuesday. The marine layer will remain near 2000 feet deep with areas of night and morning low clouds and patchy fog extending into the western valleys.

For Wednesday and Thursday...high pressure to the south will expand northward bringing a warming trend with high temperatures warming to slightly above average. The marine layer will be slightly shallower.

For Friday through next weekend...another trough of low pressure near the West Coast will bring a cooling trend with high temperatures falling to slightly below average for next weekend.

For early next week...high pressure over the central and southern plains and Rockies will expand westward slightly bringing a warming trend

SYNOPSIS FROM THE PHOENIX OFFICE
A warm, dry and stable airmass will remain across much the Desert Southwest this week giving the region a significant break in the monsoon. Afternoon temperatures over the lower deserts will remain near or a few degrees above normal. The return of monsoon moisture will gradually bring chances for thunderstorms again starting by late in the weekend or early next week

Model agreement is quite high this dry pattern will finally come to an end starting Sunday, but more likely early next week. The subtropical high will shift northward starting Saturday finally becoming centered over northern New Mexico on Sunday. This high position is much more favorable for monsoonal flow into Arizona as winds shift to a more southeasterly direction. It is difficult to know at this point when the first good chance of monsoon thunderstorms will be as it could happen as early as Sunday or wait until next Monday or Tuesday. For now we will keep the slight chance PoPs over high terrain areas on Sunday and introduce some slight chance PoPs over the south-central Arizona deserts starting next Monday. Once the moisture does return our daytime highs will decrease a few degrees and end up right around seasonal normal
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