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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.

December 29 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
...Forecast Storm Total Precip (in.) Fri-Sun Morning...

...Forecast Storm Total Snowfall (in.)...
4500-5500 ft....Trace-2 (Saturday)
5500-6500 ft....2-5 (Saturday)
6500-7500 ft....5-8 (Late Friday through Saturday)
Above 7500 ft...8-12 (Friday and Saturday)

Isolated thunderstorms have been added to the forecast for Friday and Saturday as conditions aloft will be slightly unstable.

Above normal highs today with weak high pressure aloft. A few disturbances will move across the region Friday and Saturday creating the chance of rain and mountain snow, and possibly an isolated thunderstorm. Below normal high temperatures this weekend into early next week, with winds shifting offshore by late next week.

Models have been in much better agreement for a few runs now on the second system that will dive down along the CA coast on Saturday. High-res models show showers increasing in coverage late Saturday morning, with heaviest showers moving SW to NE Saturday afternoon and evening. Once the main front moves by, additional isolated to scattered showers will develop throughout the night. Snow levels will be around 6500 ft Saturday afternoon, then lower to around 4500 ft by Saturday night. Westerly wind gusts of 40-50 mph are possible over the mountains and along desert mountain slopes Saturday night.

Anticipate warmer conditions today and Friday with highs topping 70 degrees across some area desert locations. Unsettled weather is then expected later Friday through Sunday with two weather systems affecting the region. The first low pressure system will bring best chances for rain Friday afternoon through Friday night. The second colder system will move in Saturday night with cooler air moving into the region starting Sunday. Rain will be likely Saturday night and Sunday morning with lingering showers across eastern Arizona Sunday afternoon. Mostly dry but continued cool conditions are likely for much of next week.
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