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A map shows areas in California where temperatures are expected to surpass 100 this week.
Why It Matters
There has been an early-season heat wave in Southern and Central California. On Monday, people in four states including California were warned of dangerous fire weather conditions.
In California, a red flag warning had also been issued. The National Weather Service (NWS) agency said the highest threat lay in the Central and Southern Sacramento Valley along and west of the I-5 corridor and the Northern San Joaquin valley.
Unusual weather conditions including dry weather contribute to issues such as wildfires.

What To Know
The NWS predicted highs of 90-100 and that these temperatures would increase the risk of grass fires.
It said a heat advisory would remain in place form 11 a.m. Wednesday to 9 p.m. Thursday PDT in various areas and that temperatures could reach 100 in the following areas:
Calabasas and Agoura Hills, Eastern San Fernando Valley, Eastern Santa Monica Mountains Recreational Area, Western San Fernando Valley, and Western Santa Monica Mountains Recreational Area.
The agency also warned about an elevated risk of heat-related illnesses, especially among very young or very old people or people who spend a lot of time outside or people without air conditioning.
It advised hydrating, wearing light clothing, shifting outdoor activities away from 10 a.m. to 6 p.m. and taking frequent breaks in air conditioning or in the shade.
Below is a map showing the areas particularly impacted by the high temperatures.

What People Are Saying
The NWS said: "There is a high risk for heat illness for sensitive populations including the very young, the very old, those without air conditioning, and those active outdoors. Do not leave people or pets in closed vehicles."
It added: "Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors."
AccuWeather meteorologist Adam Douty previously told Newsweek in California, conditions "will remain breezy each afternoon this week, so the fire risk will remain elevated, though may not rise quite to red flag levels."
What Happens Next
The NWS issues regular forecast updates on its website.
Meanwhile, in other weather news, severe thunderstorms are forecast to strike numerous states through Tuesday evening.
The states facing the highest tornado threats include Kentucky, Tennessee, Alabama and Mississippi. Some counties in Indiana and Illinois are also currently covered by a Tornado Watch warning.

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About the writer
Kate Plummer is a Newsweek reporter based in London, U.K. Her focus is on U.S. politics and national affairs, and ... Read more