Heat Wave Kicks Off Labor Day Weekend in San Diego

Extreme Heat, Fire Grips Calif. Ahead of Holiday Weekend

"Depending on how fast or slow the cold front moves, the hours may change", said Patricia Sanchez, meteorologist with the National Weather Service's Dallas office.

Smoke from nearby wildfires will also linger to start the day but south winds may help to improve conditions later in the day.

San Francisco itself saw one of the hottest days in its history Friday at 106 (41 C) but is now expected to recede into its usual cool-and-foggy summer pattern with dramatic temperature drops into the 80s and then the 70s.

While temperatures could hit 100 degrees in the Los Angeles fire area, they're projected to peak even higher in Northern California.

Temperatures in San Francisco are continuing to climb. The range for Napa will be between 98 and 102 degrees, he said.

The NWS said the temperatures will decrease slightly on Sunday, with more clouds and moisture stemming from the remnants of Tropical Storm Lidia.

The warmth extended up the West Coast and into mountain states, with excessive-heat warnings posted for southwest OR and lesser advisory-level conditions in northwest Oregon. The Watch runs from early Friday through Sunday evening. The high is expected to be 72 degrees. The last time temperatures were that high in San Francisco was on June 14, 2000 at 103 degrees.

In addition, the Oregon Department of Environmental Quality has extended the current Air Quality Alert until further notice, meaning wildfire smoke will continue to pour into the southwest part of the state. Forecasts predict this weekend will be the hottest Labor Day weekend on record at PDX. This could result in a cold front pushing through bringing cooler conditions, which would be the first such system in the region in nearly three months, according to the National Weather Service in Portland. Know the signs and symptoms of heat exhaustion and heat stroke.

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