Firefighters working vegetation fire in Talbert Regional Park in Costa Mesa

An Orange County Fire Authority helicopter makes water drops on a brush fire in Talbert Regional Park in Costa Mesa on Sunday, April 15, 2018. (Photo by Richard Koehler, contributing photographer)
A brush fire burns in Talbert Regional Park in Costa Mesa on Sunday, April 15,2018. (Photo by Richard Koehler, contributing photographer)
Onlookers watch as an Orange County Fire Authority helicopter departs after making a water drop on a brush fire in Talbert Regional Park in Costa Mesa on Sunday, Apr