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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 12 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
A trough over the western U.S. will move east on Friday with surface high pressure building into the Great Basin this weekend. The result will be onshore winds transitioning to offshore this weekend, along with warming temperatures, especially west of the mountains. Weak ridging will build across the area early next week with another trough poised to move to the west coast by the middle part of next week. The trough will be moving out of the area on Friday with a gradual warm up commencing west of the mountains. Temps over the mountains and deserts will change little. Cold surface high pressure will be building into the Great Basin behind the trough this weekend. This would result in NE winds in the favored locales to be not quite as strong compared to last Monday. Still gusts of 30-40 mph are forecast through and below the Cajon Pass, the San Gorgonio Pass and along the western slops of the Santa Ana Mountains across inland OC. Locales such as Freemont Canyon in Orange County could gust to 50+ mph.

Weak high pressure will persist across the region into next week allowing for continued warm and dry conditions. Lower desert high temperatures will generally reach into the lower 90s each day. The dry westerly flow will also result in generally cloud free skies. The forecast over the next 7 days will mainly fall in the realm of persistence with continued above normal temperatures and dry conditions. It would seem the heat of the summer was trying to make a bit of a comeback across southeast and south-central Arizona as Phoenix hit 98 degrees yesterday (4F shy of the record) and Tucson ended up just 2F of the record with a high of 97 degrees. Fortunately the deep trough well to the north will sag a bit further southward allowing for a few degrees of cooling today and maybe another degree drop-off on Friday. Models are now overall trending warmer for the first part of next week as a building upper level high over Mexico this weekend shifts farther northward into the Southwestern United States than previously seen earlier this week.
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