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 25 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
An upper level disturbance moving westward off the northern Baja coast will draw mid level monsoonal moisture into far Southern California with a slight chance of showers and thunderstorms over southern San Diego County today and the mountains for this afternoon and evening. Slowly warmer inland for Tuesday through Friday as high pressure aloft strengthens slightly. For Friday through next weekend...an influx of monsoonal moisture will bring cooling for next weekend...and a slight chance of afternoon and early evening thunderstorms...mainly near the mountains

The large convective complex that was over northwest Mexico early Sunday morning generated a mesoscale convective vortex. It moved slowly westward across northern Baja and is now centered near the northern Baja coast. On the north side of the circulation center it is drawing mid level monsoonal moisture across far northern Baja and towards far Southern California. Showers have developed in this band of moisture with thunderstorms in northern Baja adjacent to the far northwest Gulf of California. A slight chance of showers and thunderstorms has been added to southern San Diego County this morning and extended northward along the mountains to the San Bernardino Mountains for this afternoon and early evening. The cloud cover from this mid level moisture may bring some slight cooling today...more to the south and less to the south.

Otherwise...some slight inland warming is expected for Tuesday through Friday as high pressure aloft strengthens slightly. A greater influx of monsoonal moisture is possible for Friday through Sunday with a slight chance of afternoon thunderstorms... mainly near the mountains...along with some inland cooling for next weekend.

SYNOPSIS FROM THE PHOENIX OFFICE
An increase in moisture and cloud cover over the region is expected to take some edge off the heat, and provide somewhat better chances of showers and thunderstorms through the middle part of this week. The best opportunity for rainfall will occur over the higher terrain north and east of Phoenix, with lesser chances heading west into southeast California. A better chance for showers and thunderstorms is then forecast for the end of the week and into the upcoming weekend, as deeper moisture begins to move into the region from the south and southeas
Weather Story Phoenix Station Weather Story San Diego Station
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