Southern California is baking under a powerful heat wave this week, prompting urgent warnings for more than 8 million people to limit time outdoors and stay cool. The National Weather Service (NWS) extended its heat advisory through 9 p.

Much of Southern California has been placed under a heat advisory Tuesday as the first of a dayslong heatwave arrives. Henry DiCarlo has KTLA's forecast on Tuesday, May 20, 2025.

Heat cramps, painful muscle cramps and spasms, usually in the legs and abdomen, may also be a symptom of heat exhaustion. Apply firm pressure on cramping muscles or gently massage to relieve spasms. Give sips of water unless the person complains of nausea, then stop giving water.

Some relief from the heat is expected Thursday, but not much, with temperatures reaching the mid 90s in the valleys and triple digits in the Coachella Valley. The high in the valleys and Inland Empire will be 96 Thursday,

Temperatures around the world continue to rise—and the North Sea is no exception. Yet, in addition to this gradual warming, increasingly frequent and intense heat events also have consequences for marine organisms.

The adaptation appears to help the fish cope with high temperatures, since individuals and breeding pairs that shrank improved their survival odds

The National Hurricane Center (NHC) has flagged the first area to watch in the Eastern Pacific less than a week after the official start to that hurricane season. FOX Weather Meteorologists Marissa Torres and Stephen Morgan break down the forecast on Tuesday, May 20.

Heat waves destroy crops, drive wildfires, and kill humans and wildlife, but these extreme weather events aren't just limited to land. Large bodies of water can also be hit by heat waves that linger for weeks,