An elevated risk of fire will prevail Tuesday in the Antelope Valley and its San Gabriel Mountains foothills because of high temperatures, dry conditions and high winds, and foul air will bedevil the Santa Clarita Valley, forecasters said.

Highs in the Antelope Valley could reach 104 degrees Tuesday, according to the National Weather Service.

To minimize the risk of sparking a fire, the weather service urged residents to refrain from burning brush or trash outdoors, parking vehicles on grass, or leave a hot grill unattended. The NWS also urged residents to wet the ground before conducting work and warn kids not to play with fire.

NWS meteorologist Todd Hall said humidity levels in the Antelope Valley would be 8-15 percent Tuesday amid winds of 15-25 miles per hour and gusts of up to 45 mph. The Valley will be 7-9 degrees above normal but closer to normal in the rest of the county, especially in coastal areas.

While the Antelope Valley will be the hottest residential community in L.A. County Tuesday, other valley areas won’t exactly be cool, with highs of 90 expected in the Santa Clarita Valley.

The Santa Clarita Valley will experience not only relatively high heat Tuesday but also foul air.

The South Coast Air Quality Management District predicted that air quality will be unhealthy Tuesday for sensitive individuals in the Santa Clarita Valley.

Los Angeles County Health Officer Muntu Davis advised people living or working in that area to minimize outdoor activities if they suffer from heart disease, asthma or other respiratory illnesses. Children who have sensitive conditions also should not participate in outdoor physical activity and should stay indoors as much as possible, he said.

The NWS forecast partly skies in the county Tuesday and highs of 72 degrees in Avalon and at LAX; 77 in Long Beach; 79 in Downtown L.A.; 80 on Mt. Wilson; 82 in San Gabriel; 84 in Burbank; 85 in Pasadena; 89 in Woodland Hills; 90 in Saugus; and 102 in Palmdale and Lancaster. Temperatures will remain at that level until Sunday, when they’ll dip by up to seven degrees in some communities but minimally in others. The sharpest fall will be in the Antelope Valley, where Monday’s high of 85 will be 17 degrees lower than Tuesday.

Partly cloudy skies were also forecast in Orange County, along with highs of 71 degrees in San Clemente and Laguna Beach; 72 in Newport Beach; 75 on Santiago Peak; 78 at Fremont Canyon; 79 on Ortega Highway at 2,600 feet; 80 in Irvine; 81 in Fullerton and Mission Viejo; 82 in Anaheim; and 83 at Trabuco Canyon and in Yorba Linda. Orange County temperatures will remain roughly at that level until Sunday, when they’ll dip by a few degrees, followed by slightly more dipping Monday.

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