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.

August 11 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
Fair and seasonal weather will continue today as a trough of low pressure moves through the West. High pressure will build beginning Friday and bring noticeably warmer weather through the middle of next week. Coastal low clouds will be notably less extensive

Temperatures will peak Sunday through Tuesday with readings around 105 in the inland empire and high desert and up to 112 in the lower deserts. This could be a "mini heat wave" event, with temperatures up to 10 degrees above normal, possibly reaching heat advisory levels for the inland valleys and deserts.

SYNOPSIS FROM THE PHOENIX OFFICE
The weather pattern will allow for a transition to drier and more quiet conditions for the end of the week as moisture levels trend down. With this drying trend, temperatures will also increase through the weekend and into early next week with readings at or above normal levels

From Friday into early next week, moisture levels decrease substantially with 1000-700mb mixing ratios dropping below 8g/kg in most areas as a high pressure center shifts off the Pacific into the Great Basin. This northerly flow aloft around the high will bring even drier air into the Desert Southwest as daytime surface dew points drop into the 40s to low 50s. Any thunderstorm chances during this time period will reside mostly over far eastern Arizona which includes eastern Gila County. As the atmosphere dries, temperatures will subsequently rise to above normal levels. Highs should even top 110 over southeast California and southwest Arizona and will come close to Excessive Heat levels in the Imperial Valley by Sunday. These above normal temperatures will likely persist through Monday before gradually decreasing, especially over south-central Arizona where a modest moisture return is forecast for the middle of next week. Both the GFS and European generally show some monsoon moisture working back into portions of Arizona starting next Wednesday bringing a return to storm chances.
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