Get ready: The most comfy temperatures in months are on the doorstep of much of northern and central California.
Between Monday and Tuesday, a trough of lower pressure air through the upper atmosphere will unlock an early taste of fall across the Central Valley, Bay Area and western U.S.
A trough refers to this area of lower pressure dipping down from Canada, creating a valley shape on atmospheric height maps where the low pressure resides. These features are a normal part of U.S. weather, and typically come with stretches of cooler, cloudier, and sometimes rainy weather…