Claremont Weather: Air Quality Across San Gabriel Valley

CLAREMONT, CA— With offshore winds dying down, red flag warnings denoting a high risk of wildfire expired across the Southland Tuesday, but forecasters warned that brush fires were still a danger thanks to low humidity.

The NWS forecast sunny skies in L.A. County Tuesday and highs of 74 degrees on Mount Wilson; 77 in Avalon; 79 at LAX; 80 in Palmdale and Lancaster; 83 in Long Beach; 84 in Saugus; 85 in Downtown L.A. and Burbank; 86 in San Gabriel; 87 in Claremont and Pasadena; 88 in Glendora; and 89 in Arcadia, Diamond Bar and Woodland Hills; and 91 in Baldwin Park. Temperatures will decline by 1 to 8 degrees Wednesday and fall again by just a few degrees on Thursday before ramping up again on Friday, generally netting out at slightly higher levels than Tuesday.

Air quality in the Southland is just a few tics below unhealthy, according to Air Quality Index reports, due to particles in the air from the Canyon Fire 2 burning off the 91 Freeway in Orange County.

The red flag warnings went into effect Monday amid powerful winds, relatively high temperatures, low humidity and the presence of very dry vegetation. Those warnings expired at 10 a.m. in the San Gabriel Mountains in Los Angeles and Ventura counties, the forests stretching over the range -- the Angeles National Forest in L.A. County and Ventura County's Los Padres National Forest -- the Santa Monica Mountains, the Santa Clarita and San Fernando valleys, the foothills of the San Gabriel Valley and L.A.'s coastal zone, which includes beach cities, metropolitan L.A., the downtown area and the Hollywood Hills.

"Offshore winds have weakened and are not expected to return in the near term," according to the National Weather Service. "However, elevated fire weather conditions will continue due to low humidities and breezy conditions."

A wind advisory indicating winds or gusts of 35 mph will be in effect until noon in the San Gabriel Mountains and Santa Clarita Valley. Winds of 20 to 30 mph gusting at 45 mph will blow through the San Gabriels, while in the Santa Clarita Valley, the forecast calls for winds of 15 to 25 mph with 35 mph gusts.

"Winds this strong can cause power outages," the NWS warned. "Cross winds can make driving difficult, especially for drivers of high profile vehicles and vehicles towing trailers."

Sunny skies were forecast in Orange County, along with highs of 71 in Laguna Beach and San Clemente; 73 in Newport Beach; 74 in Aliso Viejo; 78 in Laguna Niguel; 79 in Los Alamitos; 80 in San Juan Capistrano; 82 in Lake Forest; 83 in Anaheim, Irvine and Mission Viejo; 84 in Rancho Santa Margaita; and 85 in Yorba Linda, Trabuco Canyon and Fullerton.

The cooler temperatures will change little over the next six days, but the higher temperatures will decline by up to 7 degrees Wednesday, then begin climbing again and revert to roughly Tuesday's levels by Saturday.

4-day Forecast for Claremont-La Verne

Today, partly cloudy starting tonight, continuing until tomorrow morning.

Wednesday October 11

Partly cloudy in the morning. High 77, low 55.
Chance of precipitation: 0%. Wind 3 mph from the SW

Thursday October 12

Clear throughout the day. High 76, low 54.
Chance of precipitation: 7%. Wind 2 mph from the W

Friday October 13

Clear throughout the day. High 79, low 53.
Chance of precipitation: 4%. Wind 5 mph from the NNW

Saturday October 14

Dry throughout the day and partly cloudy overnight. High 82, low 51.
Chance of precipitation: 0%. Wind 3 mph from the NNE
Data provided by darksky.net.

Orange County Fire Authority Photo