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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 23 2018
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
The NWS has declared an EXCESSIVE HEAT WARNING in effect from Tuesday 10 am through
Wednesday 8 pm for Imperial County. Temperatures should reach 115 or higher.

WINDS: West to southwest winds 10 to 15 mph are forecasted for Imperial County.

Isolated thunderstorms are possible near the mountains for this afternoon. Strong high pressure aloft will move into Southern California through mid week bringing a period of very hot weather except near the coast and at the highest elevations of the mountains. The heat is expected to peak on Tuesday and Wednesday with high temperatures 10 to 15 degrees above average. For areas near the coast a shallow marine layer and a weak coastal eddy will keep areas near the coast not quite as hot with higher humidities. For late in the week into next weekend the high pressure will weaken slightly and begin to shift northward. This will bring a cooling trend into next weekend with a return of monsoonal moisture for next weekend into next week.

Extremely hot temperatures will bake the region for the next several days with the hottest weather of the year, and near record highs for many locations. After a several day period of drier weather, better moisture will begin streaming into the area later in the week. Given the inland thermal intensity by the middle of the week, undoubtedly a surge of shallow Gulf of California moisture will stream into part of the forecast area breaking the extreme magnitude of heat (very historically typical in these situations). Even GFS BUFR data which usually does not capture lower level moisture accurately shows robust shallow moisture profiles entering SE California and SW Arizona Thursday morning. Depending on the magnitude and northward extent of this surge, Excessive Heat Warnings may need to be extended for parts of SE California through Thursday evening. More extensive thunderstorms will begin over higher terrain areas of Arizona Thursday, gradually spreading towards lower elevation communities during the weekend.
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