Temperatures are expected to reach the low 90s today in Long Beach, according to the National Weather Service.

The Flex Alert will take effect at 2 p.m. Wednesday and continue until 9 p.m., according to the California Independent System Operator, which manages the state’s power grid. The alert was originally scheduled for 3 to 10 p.m.   

Health screenings, temperature checks, physical distancing and face coverings are required for visitors.

Long Beach won’t be as miserable: It is expected to hit 83 degrees today, with temperatures in the low- to mid-80s for the next few days.

The expected high heat will result from very strong high pressure, along with warm offshore winds from the north, which are rare for this time of the year, said National Weather Service meteorologist Curt Kaplan.

With the National Weather Service forecasting highs in the 90s and low 100s in parts of Long Beach, as well as high humidity, today and tomorrow, city officials are advising residents to take precautions against the heat.

A heat wave is expected to take over Southern California for most of the week, with the National Weather Service forecasting temperatures peaking in the low 90s in Long Beach and reaching triple digits in other areas while increasing health risks and the risk of wildfires.

The National Weather Service forecasting temperatures ranging from the high 80s to high 90s in parts of Long Beach today through next Thursday.

An “extended period of hot and dry weather conditions” will affect areas away from the coast “through at least early next week,” with temperatures rising daily because of a weak offshore flow, bringing a “moderate heat risk to those sensitive to heat.