How to resolve AdBlock issue? LAKE COUNTY, Calif. — Century mark-topping temperatures are expected late this week and into the weekend, with forecasters warning of the first heatwave of the year, ahead of the official beginning of summer.
The National Weather Service has issued a heat advisory for a large swath of Northern and Central California — including Lake County — due to the forecast.
For Lake County, the heat advisory will be in effect from 11 a.m. Friday to 10 p.m. Saturday.
Daytime temperatures in Lake County during those two days are expected to range as high as 105 degrees, with nighttime temperatures in the high 50s.
Meteorologists with AccuWeather said the high temperatures will be the result of a strong dome of high pressure.
“This will be the first heat wave of the season in the West, outside of Southern California. A strong area of high pressure in the upper levels of the atmosphere will bring plenty of warmth,” AccuWeather Senior Meteorologist Heather Zehr said. “A general offshore flow, where the wind travels from the land to the water, will enhance the heat. This prevents any cooling by the lower ocean water temperatures along the coast. This offshore flow is caused by the strong high-pressure area to the north and a broad upper-level low setting up over the Pacific west of northwestern Mexico.”
AccuWeather said the most intense heat will be centered across interior California, Nevada and western Utah.
The National Weather Service said that after the high temperatures on Friday and Saturday, they expect “a likely quick cooldown in temperatures into early next week.”
From Sunday into early next week, more comfortable temperatures are expected, ranging from the 70s into the high 80s.
Forecasters said an “anomalously cold upper trough” — a trough is defined as an elongated area of low atmospheric pressure — is expected to move in from the north early next week.
“This could mean an even more dramatic cooldown of temperatures, late season precipitation or even thunderstorm activity depending on how the low evolves,” the National Weather Service said in its long-range forecast.
Offering additional explanation, AccuWeather said two main storm systems will help break the heat wave and may bring some rainfall to the West.
The first will be a storm that drops southeastward from the northern Pacific and then pushes inland over the Northwest. That alone should be enough to trigger at least spotty showers and thunderstorms. Where there are lightning strikes and little or no rain, wildfires may erupt.
Both storms will work in conjunction to break the heat wave and send temperatures trending downward while humidity levels rise.
The National Weather Service said the Climate Prediction Center is leaning towards above normal precipitation for the region next week.
This week’s hot temperatures are likely to be a taste of things to come.
AccuWeather’s 2025 U.S. Summer Forecast says overall summer temperatures are expected to be roughly 2 to 3 degrees or higher than the historical average this year across much of interior California and the western U.S.
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