cold front

The weather will start to cool down on Saturday as a cold front pushes southwards, with the air turning progressively colder into next week as an Arctic air mass becomes established.

The high pressure system that locked Southern California in a heat dome last week has been displaced by the passage of a weak and dying cold front.

The three blazes are still largely uncontrolled, but an incoming cold front and cloudy weather this weekend are expected to offer some reprieve, officials said Saturday.

An unusually strong, early-season cold front was moving across Northern California on Friday, bringing with it the possibility for rare August snow along the peaks of the Sierra Nevada.

For New York City, Sunday might be the hottest day in this heat wave, until a cold front breaks it on Monday, Mr. Engle said.