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Southern California weather: Strong winds and low humidity increase threat of wildfires and power shutoffs over Thanksgiving holiday | The Blog 101


A red flag warning affecting 17 million people goes into effect Wednesday morning for Ventura, Los Angeles, portions of San Bernardino, Riverside, Orange and San Diego counties, according to the National Weather Service (NWS).
A red flag warning means critical fire weather conditions are expected, including strong winds, low relative humidity and warm temperatures, the NWS said.

The warning will be in effect through Friday afternoon.

Winds will be strongest Wednesday afternoon, according to the NWS. Some areas could experience isolated gusts of 60-70 mph across the foothills and mountains.

Humidity in the Los Angeles area will be dangerously low at 10%-15% Wednesday, then drop potentially as low as 2%-8% Thursday, the NWS said.

“Any fires that develop will likely spread rapidly,” the NWS said. Residents are being encouraged to be prepared in the event a wildfire ignites.

“Now is the time to activate your emergency plan in case of evacuations during a fast-moving #wildfire, even at night,” a tweet from the NWS in Los Angeles said.

In the San Diego area, conditions will be slightly better with wind gusts up to 60 mph and relative humidity between 7% and 15%, CNN Meteorologist Robert Shackelford said.

The gusty conditions could lead to delays at airports in the region.
California's wildfires show how climate change is making forced evacuations and power shut-offs the norm

“Conditions will begin to improve Friday with likely only an elevated threat for fire weather to be issued that day,” Shackelford said.

Utility companies in the region are preparing for the wind event and warning residents power could be disrupted in an effort to prevent fires.

San Diego Gas & Electric said more than 43,000 customers could be affected by a public safety power shutoff and Southern California Edison says more than 132,000 customers could be impacted.
California has suffered through a devastating wildfire season, with 8,367 fires reported in the state this year, scorching more than three million acres, according to Cal Fire. The fires have been exacerbated by climate change creating hotter and drier conditions.

CNN’s Robert Shackelford contributed to this report.

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