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.

October 23 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
GUSTY SANTA ANA LIKE WINDS AND INCREASED TEMPERATURES OVER THE NEXT FEW DAYS

SYNOPSIS FROM THE SAN DIEGO OFFICE
High pressure aloft and surface high pressure over the Great Basin will bring strengthening Santa Ana winds and increasing daytime heat into Tuesday. Winds becoming more localized and not quite as hot for Wednesday. Cooling will spread slowly inland for Thursday through next weekend with a gradual return of night and morning coastal low clouds and fog. SHORT TERM (Today through Wednesday) calls for strongest gusts in the windier locations were around 45 mph Sunday, similar to the current stronger gusts. Santa Ana winds will gradually strengthen into Tuesday and expand in coverage towards the coast. The peak of the heat is expected for today and Tuesday with Tuesday slightly hotter. The hottest high temperatures are expected for inland coastal areas into the western valleys with high temperatures exceeding 100. Winds will become more localized and not quite as strong for Tuesday night and Wednesday. Not quite as hot for Wednesday.
The LONG TERM (Thursday through Sunday forecast calls for weak onshore flow will return with a slow cooling trend spreading inland for Thursday through Monday but with high temperatures remaining above average. Night and morning coastal low clouds and fog will gradually return with slow deepening of the marine layer.

SYNOPSIS FROM THE PHOENIX OFFICE
Well above normal temperatures will persist the next several days as a strong area of high pressure prevails across the western states. The high pressure system will weaken throughout the week, resulting in a gradual cooling trend through early next week, though temperatures will continue to remain above normal. Dry conditions will also persist with no chance of rain through the end of the month. Overall weather pattern is quite amplified across the CONUS with an anomalously strong ridge predominating the eastern Pacific. Latest ENS/NAEFS 500 mb heights indicate record-breaking values (Climatology through 1979) this afternoon across the Desert Southwest. Biggest sensible impacts from the ridge will be felt to our west across Southern CA, where another Santa Ana wind event is expected. Across Arizona, the main impact will be in the form of near record heat. High temperatures in the Phoenix area will flirt with the 100 degree mark through Tuesday. Latest operational models show the ridge building across the Great Basin Tuesday, which will produce a downslope flow and subsequent adiabatic warming during the afternoon across the lower deserts. Record high in Phoenix is only 96 degrees Tuesday, so there is high likelihood this will be eclipsed. A discernible cooling trend will commence Wednesday as the aforementioned ridge weakens.
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