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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 6 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
High pressure and offshore flow will bring very warm and dry weather today and Saturday, along with gusty northeast winds in the foothills and valleys. Onshore flow returns Sunday to bring cooler weather along with some coastal clouds. Offshore returns quickly on Monday and into Tuesday for more dry weather and areas of strong Santa Ana winds, mainly in the valleys and foothills. Fair and seasonal weather will follow Wednesday through the remainder of the work week. Very dry and warm air across all but the immediate coast this afternoon with some sites reporting single digit RH. Winds have also been breezy through the canyons and the foothills with gusts into the 30s at times (Fri). Winds will gradually weaken Saturday but RH recoveries will be very poor through Saturday. On Sunday a trough passage will bring cooler weather with onshore flow which will bring some relief from the hot and dry conditions. Onshore flow will return with some gusty winds through the mountains and deserts. Another major pattern shift takes place on Monday as a very strong surface high develops in the Great Basin and sets the stage for a moderate Santa Ana wind event basically from early Monday morning through Tuesday morning. Wind gusts through and below the canyons and in the foothills will be quite strong with gusts to 50 mph possible. Due to the persistent troughy pattern, temperatures will not be as warm as today and Saturday, however the strong downsloping winds will bring very dry air once again and overall slightly warmer temperatures. Temperatures in the High Desert will remain cooler than most other areas during this time frame.

Dry conditions with above normal temperatures will continue through the weekend. It will also be breezy at times. Cooler conditions are likely early next week with temperatures dropping back to near seasonal normals. A broad upper-level trough over the western CONUS is bringing dry and breezy conditions to our area. Breezy winds are accompanying this weather system, with wind speeds near and along the Colorado River Valley remaining elevated this afternoon with northerly gusts up to 25 to 30 mph. The weather pattern won`t change much over the weekend, with very dry west to northwest flow keeping clear skies and above average temperatures in place. On Saturday and Sunday across the lower deserts, high temperatures will be in the mid to upper 90s with low temperatures dropping into the upper 50s and 60s.
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