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 20 2017|
|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|
Mostly clear skies through tonight. Evening west winds 23 - 34 mph with gusts 46 mph will create a moderately strong up and down drafts and surface winds could gust to 34 mph.
SAN DIEGO OFFICE - DISCUSSION
An unseasonably deep trough will drop out of Washington down the West Coast today and Thursday. There is a weak front-like feature that pushes through Southern California Thursday late morning. It looks capable of producing light showers anywhere from the coast to the mountain crests. Some foothill locations might get more than a tenth inch, but only a hundredth or two is most likely in the lower elevations.
Winds will crank up as well in the mountains and deserts Thursday afternoon and evening. Top gusts in the top spots, such as through mountain passes and adjacently downwind, will exceed 50 mph, but most areas will stay under 45 mph.
Thursday and Friday
Temperatures will be mostly in the 70s, but 80s in the lower desert Thursday and Friday
PHOENIX OFFICE - DISCUSSION
Skies remain clear to mostly clear across the Southwest United States while a large upper level trough is situated across the Northwest United States. Dry westerly flow still persists across the Desert Southwest to the south of the large trough, but this will shift more out of the southwest starting Thursday. This will occur as a strong shortwave trough digs down along the western edge of the large trough allowing it to dive into the Great Basin and southern California on Thursday. Deepening surface low pressure to our north on Thursday will promote a strong pressure gradient and breezy to windy conditions across the region with gusts across southeast California approaching Wind Advisory levels and gusts of 25 - 30 mph across southern Arizona.
|Weather Story Phoenix Station||Weather Story San Diego Station|