The polar jet stream will take a deep dive across the eastern U.S. spilling widespread cooler-than-normal temperatures for ...

In short, zonal flow brings quick hits. Expect brief rain, quick clearing, and limited cold. Meridional flow, on the other hand, bends the atmosphere into slow-motion mode, allowing polar air and ...

Monday will offer the kind of weather that makes the Bay Area feel amazing, with light offshore breezes, blue skies and warm temperatures. But that serenity masks a brewing change over the Pacific.