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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.

September 25 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 over the Great Basin will force weak to moderate offshore flow over Southern California early this week. The dry northeast winds will lower humidity, and bring much warmer days, but nights will remain moderately cool. Winds will be gusty at times along the coastal foothills, and below passes and canyons, increasing the wildfire potential in these areas. The stronger gradient from the northeast signals stronger offshore winds favoring the more N-S oriented passes and canyons. Peak wind gusts at 3 AM PDT were 35-40 MPH at Fremont Canyon in the Santa Ana Mts and Crestline above the Cajon Pass in the San Bernardino Mts. Gusty winds are still on track to develop below the passes and canyons of San Bernardino and Riverside Counties, and the Santa Ana Mts, with weaker NE winds along the coastal foothills of San Diego County. Despite the high clouds, skies will be mostly sunny today.

Under sunny skies, temperatures will slowly warm over the next few days though readings will remain slightly below average. Monday afternoon is forecast to be yet another exceptionally cool day as the upper level trough remains overhead. Temperatures should be up to near 90 for almost all lower desert locations today which is still 7-10 degrees F below normal. Expect this trend to continue throughout the week with upper 90s returning by the end of the work week. A bit stronger winds out north today, with locally breezy conditions developing during the morning, peaking late morning to early afternoon and favoring the north at both KBLH and KIPL. Could see occasional gusts over 20kt before winds taper off later this afternoon. Wind to favor northwest tonight into Tuesday morning. Otherwise no aviation concerns for at least 24 hours. An area of low pressure may pull moisture back into eastern Arizona by the middle and end of the week supporting some late season showers and storms.
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