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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.

October 24 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
Scattered showers and isolated thunderstorms will continue through this afternoon as a weak low pressure trough moves across the region. Fair and warmer midweek as high pressure rebuilds aloft. Another low pressure trough will bring more clouds...cooling...and a chance of precipitation late in the week.

Showers and thunderstorms continue to move north-northeast across the region this morning, mainly over Orange, Riverside, and San Bernardino Counties. The main band of precipitation has begun to shift east slightly with shower activity increasing over portions of San Diego County. This eastward trend will continue through the afternoon as a short-wave trough rotating around the base of the upper low off the coast lifts northeast and weakens. Both the NAM, and to a lesser extent, the GFS, show increasing elevated instability and a 110 kt jet streak nosing into the area this afternoon. This will maintain the chance of showers and thunderstorms through the day, with precipitation gradually tapering off from west to east by late afternoon as drier air filters into Southern California.

A low pressure system northwest of the region continues to draw a considerable amount of subtropical moisture into the Desert Southwest. This will lead to a threat of isolated showers and thunderstorms through tonight. Showers and a few thunderstorms are possible over southeast California and southwest Arizona through early afternoon and then mainly late this afternoon and early evening over south central Arizona. Drier and warmer conditions will return by the middle of the week.
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