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.

April 1 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
A persistent low pressure system will slowly exit the region today with only a slight chance of light showers over mountainous areas of eastern Arizona. Otherwise a distinct warming trend will prevail through early next week with temperatures climbing well above normal. An unsettled wet weather pattern may finally return to the Southwest by the end of the next week.

Days under the influence of the large cut-off low that set-up over the intermountain west earlier this week will come to end this weekend with one additional follow-along shortwave moving in from the north today. Trailing trough energy has dropped into northern old Mexico this morning with prominent northerly flow through the ATMO column on 12Z regional RAOBS. Earlier batch of ML clouds over southeast California have dissipated into the morning with mostly clear skies across the forecast area currently. Enough moisture lingers through the ML and in combination with the latest existing shortwave and still cold temperatures aloft limited CU fields over the deserts and afternoon terrain driven showers over the eastern Arizona higher terrain will result later in the day. Warming trend to continue for the afternoon as well with 850/700MB temps seeing about 3C of warming from 31/12Z RAOBS. Current forecast is in great shape.

NWS indicates no significant updates needed this AM.

High pressure will bring fair and warmer weather this weekend. Coastal low clouds will appear nights and mornings within a shallow marine layer. Warmer weather is expected Tuesday and Wednesday as warm air from the south moves into the region and combines with offshore flow. That southerly air could also bring enough moisture for showers on Thursday.

It will be really nice and seasonal this weekend. The marine layer is trying to rebuild and areas of low clouds have begun to develop this morning. At the same time the northerly flow over the interior west will bring one final shortwave through our mountains and deserts with some middle and high clouds this morning. For today and Saturday high pressure aloft along the west coast will slowly move over southern California and mostly clear skies are expected this weekend outside the marine layer. The higher pressure will suppress the marine layer and only coastal areas and westernmost valleys will get hose nocturnal low clouds and fog. Not much change Saturday through Monday as temperatures will be quite seasonal. Max temps will be in the high 60s at the coast 70s and lower 80s in the valleys and upper desert and 80s rising into 90s in the lower desert. Things begin to change Tuesday. A weak upper level low pressure system over the ocean to our southwest will draw warm and moist air northward. Meanwhile a cold trough moves through the interior west and pushes air toward the coast giving us offshore flow. The combination of the warmer air and offshore flow will boost temperatures Tuesday and especially Wednesday into the 80s across most valleys
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