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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.

August 25 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 trough along the west coast will result in cooler than average temperatures through Saturday along with a deeper marine layer. A ridge will build into Southern California early next week, leading to warmer conditions. No rain is in the forecast as monsoonal moisture looks to keep its distance from the area through next week

A trough over the west coast of the U.S. will be the dominant weather feature through Saturday. This will result in temps running below average and a deeper marine layer with nighttime/morning low clouds spreading further inland.

A ridge will build into the area early next week. GFS continues stronger with the ridge compared to the ECMWF, but has lessened its strength a tad. Excessive heat is not anticipated. Have used a blended approach for temps during this period. Yet another trough is poised to move in during the middle and latter part of next week per model consensus. This will result in a cooling trend for the 2nd half of next week after a hotter early part of the week.

A few afternoon and evening thunderstorms are forecast over the central and eastern Arizona mountains today. Mostly sunny skies and near normal afternoon temperatures are forecast elsewhere in southeast California and southwest Arizona. On Friday, a surge of monsoon moisture will return to southern Arizona resulting in an increasing threat of afternoon and evening thunderstorms over portions of south central Arizona through Saturday. On Sunday a strong high pressure system will build into the region for drier, warmer, and more stable weather lasting into the middle of next week.

Friday through Sunday.
Increasing low level south winds below 10 thsd ft, are still forecast to transport increasing amounts of monsoon moisture from Mexico, surging north at times predominately into south central AZ toward Gila Bend, Phoenix, and Tucson. At the same time, the former Canadian trof in Utah is forecast to slowly deepen into northern AZ Friday through Sunday, with mid/upper level flows becoming increasingly cyclonic over AZ. In fact a 500 mb closed low center is forecast to develop over northwest AZ Saturday.

Increasing monsoon moisture, relatively cool air aloft, and hard to time cyclonic perturbations will result in a threat of afternoon and evening showers and thunderstorms across much of south central AZ Friday and Saturday, including the greater Phoenix area. Our forecast areas in southeast CA and southwest AZ should remain fairly stable for little or no storm threats.

Monday through Thursday...A strong high pressure system located off the southern CA coast will finally build into AZ stabilizing the airmass and shifting most of the monsoon moisture into far southeast AZ. This setup should preclude any convection in our forecast area
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