An excessive, prolonged heat wave will further parch large swaths of California in the longest and hottest heat wave of the year, according to forecasters at the National Weather Service.
Beginning Wednesday, the weather service predicts triple-digit temperatures will create hot, dry conditions that will spread north later in the week. Excessive heat will dominate the forecast through at least Sunday.
The heat may be record-breaking and will likely produce a very high heat-illness risk, said David Sweet, meteorologist for the National Weather Service in Oxnard.
"A large dome of hot air will be sitting over Southern and Central California," Sweet said. "The immediate coast will be the coolest with temperatures in the upper 70s to mid-80s. There will be an elevated fire danger, but no winds."
Temperatures in some inland areas of Ventura County, including Ojai, Somis and Fillmore, are predicted to be between 100 degrees and 110 degrees, creating torrid conditions that may extend through Tuesday of next week.
Camarillo and Thousand Oaks will see temperatures in the mid-90s.
Ventura County Fire Department spokesman Andy VanSciver said the agency currently has no operational plan for the heat wave.
"The excessive heat does not currently meet the criteria to go into a staffing plan," he said.
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VanSciver pointed out that increased staffing plans are not dependent on a single data point, such as excessive heat.
"We evaluate everything on a daily basis that is subject to change," he said.
Sustained high pressure will keep temperatures in coastal areas above normal. Ventura and Oxnard, along the coast, will have temperatures in the mid-80s, according to Sweet. The high pressure is pushing into the state and making it difficult for the onshore flow of marine air.
The heat wave will expand into Northern California later in the week. In the Sacramento Valley, temperatures could reach as high as 112 degrees on Monday and Sunday.
Sweet recommends that residents stay inside with air conditioning and make plans over the holiday weekend to avoid the excessive heat.
Associated Press reports contributed to this story.
Victoria Talbot is a courts and breaking news reporter with The Star. Reach her at firstname.lastname@example.org or 805-437-0258.
This article originally appeared on Ventura County Star: California forecasted for prolonged, excessive heat wave