AIR POLLUTION
CONTROL DISTRICT

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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.

February 15, 2019 to February 19, 2018
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
IMPERIAL COUNTY
Imperial County will have breezy to windy conditions through the weekend. On Friday, west winds will reach 20 to 30 mph with gusts to 40 mph. On Saturday, west winds will be 15 to 25 mph with gusts to 35 mph, increasing to 20 to 30 mph with gusts to 40 mph into the night. On Sunday, west winds will remain strong at 20 to 35 mph with gusts to 45 mph.

WINDY FOR THE WEEKEND IN THE DESERTS
Strong winds will be mostly on ridgetops and adjacent desert slopes where top gusts at the windiest spots will exceed 60 mph. The San Diego County deserts (Borrego Springs) will have windy conditions through the weekend. On Friday, areas of west winds 20 to 30 mph with gust to 45 mph by the afternoon. On Saturday, west winds will be 25 to 35 mph with gusts to 50 mph by the afternoon. On Sunday, winds will remain equally strong at 20 to 30 mph with gusts to 50 mph.

WINTER WEATHER ADVISORY FOR THE SAN DIEGO COUNTY MOUNTAINS
The NWS has issued a Winter Weather Advisory for the San Diego County Mountains, the Riverside County Mountains, and the San Bernardino Mountains in effect until 2 am Monday for locations above 4000 feet. A cold low pressure trough will bear down on Southern California this weekend. Several waves of precipitation and strong winds will move through the mountains this afternoon and evening, Saturday evening and again Sunday. Snow is expected. Plan on difficult travel conditions. Damage to trees and power lines is possible. Total snow accumulations through Sunday of 5 to 11 inches, with localized amounts up to 24 inches, are expected. Areas of strong winds of 25 to 35 mph with gusts 40 to 60 mph.

SAN DIEGO WEATHER OFFICE
A series of weak low pressure systems will bring showers this evening, Saturday night and again Sunday afternoon through Sunday night. The coldest and strongest of these systems will be on Sunday with widespread showers and snow levels as low as 3000 feet. Wave number one arrives this afternoon and evening. Precipitation amounts a tenth to a quarter inch in the lowlands, and up to about a half inch in the mountains. Snow level drops to 5,000 feet. On late Saturday wave number two arrives but less than a quarter inch is expected and snow level down to 4,000 feet or so. On Sunday wave number three is actually the final lobe of the massive trough, a cold front that has more energy and an even lower snow level down to 3,000 feet. Sunday precipitation amounts will be a quarter to a half inch for most areas, and maybe up to one inch in the mountains of San Diego County. All three waves will come in northwest flow, which favors San Diego County for harvesting the most precipitation. Total snowfall through the weekend will accumulate above 4,000 feet with about a foot at bases of ski resorts and up to about 20 inches above 8,000 feet. Strong winds will be mostly on ridgetops and adjacent desert slopes where top gusts at the windiest spots will exceed 60 mph. Monday and Tuesday promise fair and dry weather, but rather chilly behind Sunday`s cold front in cold northerly flow. The big western trough never goes away and it develops the next trough to come down the West Coast during the middle of the week.

PHOENIX WEATHER OFFICE
An active weather pattern will continue into the foreseeable future ushering in seasonably cold temperatures and periods of wetness. Another broad trough will begin to drop into the Intermountain West this weekend with a cold air mass sinking behind along with several embedded shortwaves rotating through the Southwest enhancing the trough and rain chances. For lower desert locations, the outlook for seeing daytime temperatures reaching 60 degrees beyond Saturday looks murky at best. The first weather system will slowly move through the region Sunday and Monday bringing decent chances of rain over the deserts and snow over the high terrain. Drier conditions will briefly settle in for next Tuesday and Wednesday, but overnight lows are forecast to dip down to around the freezing mark for colder desert locations. There is also potential for a second and even wetter low pressure system late next week.
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