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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.

November 3 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
Showers over and west of the mountains by late Saturday and into Sunday and Monday

Through Monday, onshore flow and southwest flow aloft will keep high temperatures several degrees below normal with more cloud cover along and west of the mountains and a chance for light precipitation along and west of the mountains at time from Saturday into Monday. For Tuesday through Friday, weaker onshore flow would allow for slight warming to near average high temperatures, a less deep marine layer likely dry weather.

On water vapor satellite, multiple troughs are indicated over the Northeast Pacific and West coast: a strong low pressure system over the state of Washington is moving slowly south, while a short-wave trough moves through Central California, with another short-wave far west of San Diego, with west-southwest flow aloft occurring over Southern California. Although many areas have clear skies at the moment west of the mountains, there will probably be some convective cumulus that develops during the late morning and afternoon hours, resulting in partly cloudy skies in many places.

On Saturday, as the trough to the north moves down through the Pacific Northwest and Northern California and brings precipitation to those areas, the cold front associated with it dies by the time it gets to Central California. As a jet-streak moves around the north-central Pacific ridge it will help maintain a trough far west of San Diego tapping into some subtropical moisture pointing directly at Southern California tonight through late Sunday night.

Weak high pressure will build across the Southwest with a slight warming trend this weekend. A series of weak upper disturbances will move across the region during the early and middle parts of next week, bringing a slight chance of showers on Tuesday and returning temperatures closer to seasonal normal. Drier conditions are anticipated into late next week.

A more significant shift in the large-scale pattern is occurring over the Pacific Northwest as an upper trough continues to amplify. A weaker, smaller-scale disturbance was also approaching central California, but will remain well to the north of the region. A large pool of richer moisture is evident over the eastern Pacific currently, with the leading edge roughly delineated by a plume of thicker cirrus streaming northeastward towards Baja California. The eventual result of the ongoing pattern evolution will be a strengthening of west-southwesterly flow aloft, which will bring increased moisture to the Pacific coast, and eventually across the desert Southwest early next week.
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