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 27 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
Hot and dry weather will continue through Thursday. Slightly cooler over the weekend as moisture in monsoonal flow from the southeast brings more clouds and a chance of showers and thunderstorms, mainly in the mountains and deserts. The cooler conditions should persist into next week as a weak trough develops along the West Coast

A weak upper level trough will approach from the NW this weekend, and the subtropical high pres ridge will weaken and shift further east. Onshore flow will also increase a bit, and a SE flow aloft will also develop due to the repositioning of the high. Temperatures will cool down to near normal or even a few degrees below normal for this weekend, along with an influx of subtropical moisture from the SE. Enough moisture and instability should help to kick off scattered diurnal convection in the mountains and deserts beginning Friday, and continuing into early next week. Initially, there will be a risk of dry lightning as the lower levels will be slow to moisten up. Then by Sunday and Monday, there will be a threat of heavy rainfall, as an influx of deeper moisture with PWATS over 1.5" moves, into the region from the SE.

SYNOPSIS FROM THE PHOENIX OFFICE
Despite lingering moisture across the region, strong high pressure will keep thunderstorm activity isolated for the next couple days as well as keeping temperatures unusually hot. As this high pressure system weakens by the end of the week, better moisture profiles will stream north throughout the state. In addition to bringing somewhat cooler temperatures, increased thunderstorm activity will impact the area through at least the beginning of next we
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