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.

December 2 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
Strong and gusty offshore winds will develop this morning and continue through Saturday. The greatest impacts will be across Orange County to the Inland Empire and adjacent mountain areas. Warmer with lighter winds Sunday. Cooler early next week with gusty onshore winds in the mountains and deserts. Another round of moderate to potentially strong offshore winds is possible late in the week

Isolated light showers continue this morning, mainly over San Bernardino County. Big Bear has occasionally reported light snow, so expect a light dusting to around one-tenth inch of new snow at the higher peaks of the San Bernardino County Mountains. Elsewhere no measurable precipitation is expected, and showers should end by mid-morning.

Wind gusts in the wind prone passes and canyons are generally gusting in the 25-35 MPH range. Gradients will strengthen further as the surface high builds over central NV. Upper level support will also strengthen later this morning as an upper level low, currently centered over the CA/NV border, digs south and NE flow around the back side of the low moves over So Cal. Gusts 40-60 MPH will develop below the Cajon Pass into the Inland Empire and in the Santa Ana Mountains, foothills, and adjacent Orange County coastal plain by mid-morning. Isolated gusts of 70-80 MPH or higher is possible in the favored canyons in the Santa Ana Mountains, as well as on south slopes of the San Gabriel Mountains. Winds in San Diego County and the Coachella Valley will generally be around 35-45 MPH. Winds will remain strong and gusty through Saturday afternoon, then weaken through the evening. Blowing dust, tree damage, minor structural damage, and extreme cross-winds along portions of I-10, I-5, and Highways 210, 91, and 60 are possible through Saturday. High temperatures today will be anywhere from 5-15 degrees below normal, warming up to near normal west of the mountains on Saturday. The mountains and deserts will remain a few degrees below normal as cold air continues to filter in from the northeast.

Widespread warming is expected on Sunday with weak offshore flow prevailing and an upper level ridge nudging in from the west. A cooling trend will take place Monday through Wednesday as another large trough carves out across the West and sends a short wave trough across the Great Basin.

SYNOPSIS FROM THE PHOENIX OFFICE
A strong and cold low pressure will move quickly south through the region today and tonight, with its center tracking south along the Colorado River Valley. Although dry weather is forecast, strong and gusty north winds will develop across a large part of southeast California and the Colorado River Valley today through Saturday. Dry and warmer weather will return Sunday and Monday. Another large Pacific low pressure system is forecast to move into the western states next Tuesday and Wednesday, however this system will track farther north across Utah and northern Arizona. Therefore Dry, breezy, and slightly below normal temperatures are forecast the middle of next week
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