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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 11 2017
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
Although the offshore/Santa Ana winds will be much weaker today through at least Thursday, day-time humidity for everywhere except coastal areas will be very low (down to 5-10 percent each day) with very poor overnight humidity recovery. Strongest winds will be in the coastal foothills/slopes and passes/canyons where winds of NE to E winds 10-20 mph with gusts to 30-35 mph and locally 45 mph may occur.

High pressure aloft and weak offshore flow at the surface will likely keep the weather warm and dry through at least this weekend. Locally gusts northeast to east winds will occur in the coastal foothills, slopes and in the passes and canyons. Skies should be mostly clear except for passing high clouds at times.

Water vapor satellite shows an upper level ridge over the Great Basin and the aforementioned upper level low over Baja. The weak offshore flow and dry atmosphere will continue to bring warmer than normal weather (high mostly 5-15 degrees above normal) to the region today through much of the week, and possibly into the weekend and early next week as well, with models not indicating any significant trough moving down into Southern California.

High pressure across the western United States will result in dry and quiet weather this week. Temperatures will be well above average for this time of year with highs in the middle and upper 70s across the lower deserts. Mostly clear skies will be punctuated at time with varying amounts of high clouds.
Weather Story Phoenix Station Weather Story San Diego Station
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