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Whales native to Mexico and Central America are spotted dozens of times from Long Beach to the Palos Verdes Peninsula to Laguna Beach over the last three weeks.

Public health officials say two people in Southern California people have come down with dengue fever without traveling outside the United States, where the mosquito-borne illness is rare.

The first tropical storm to hit Los Angeles in 84 years dumped record rainfall and turned streets into muddy, debris-swollen rivers.

A roughly 25-foot gray whale washed ashore and died Wednesday on Dockweiler State Beach south of Marina Del Rey.

Heat Wave May Be One For The Record Books - Sherman Oaks, CA - With temperatures soaring into the 90s in Los Angeles, residents are advised to avoid outdoor activity.

A spring heat wave drove an uptick of people to California beaches, golf courses and trails on Saturday, leading to the closure of one coastal park as authorities warned people not to swarm recreational areas for fear of igniting a deadly coronavirus surge.

Stay-at-home requirements have upended the fieldwork of ecological researchers, including that of scientists and volunteers who track migrating gray whales.

Southern California went 87 days without a clean air day, the longest stretch of consecutive ozone pollution violations in at least 20 years. Regulators blame the persistence in pollution on hot, stagnant weather and are studying whether climate change is driving it.

California State Parks scientists are running tests this week to determine what caused about 1,500 fish to die in Malibu Lagoon last week, but officials suspect higher-than-normal water temperatures may have played a role.

Wildfires have burned more than 100,000 acres in Los Angeles and Ventura Counties. Fighting them were professionals and homeowners with garden hoses.

Los Angeles County's La Tuna Fire is one of 29 burning across the state, and "is the largest fire in the history of L.A. city," Mayor Eric Garcetti said.

Authorities have warned residents to watch out for mosquito bites and clean out pet bowls as the Aedes aegypti species breeds in stagnant water.

The number of gray whales migrating along the Pacific Coast of North America has steadily declined by nearly 40 percent from a 2016 peak, and the population produced its fewest calves on record this year, according to U.S. research released on Friday.