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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.

September 7 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
Fair and warmer weather is forecast today, with little to no impact locally from Hurricane Newton. A deeper marine layer and fair, cool weather will continue into the weekend. Some increase in humidity is expected, but the chance for any showers remains slim. A low pressure trough will bring cooler weather and more coastal clouds beginning early next week

For Thursday morning, hi-res models continue to show a deep, but weak cyclonic circulation developing off the SoCal coast. This eventually spins up a weak upper-level low over the CA Bight on Fri, which should help to moderate daytime temps inland across the region as well as deepen the marine layer significantly. Due to the long southerly fetch of wind developing along the Baja and SoCal coasts, the marine layer may become deep enough for some patchy drizzle at times on Thursday. There is also a modest PW increase, but models show insufficient instability to generate any showers. As the low lifts out, the atmosphere dries again as westerly flow prevails aloft

Mostly sunny skies are expected over the far western Arizona and southeast California deserts

Drier southwest flow aloft will dominate the weather across southeast California and Arizona on Friday, leading to mostly sunny skies over the deserts and warmer high temperatures. The high temperature in Phoenix Friday is forecast to climb back to the triple digits with 100 degrees forecast - just barely below seasonal normal. There may be sufficient lingering moisture over the higher terrain east of Phoenix to allow isolated afternoon thunderstorms to form however.
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