Pineapple Express has drenched Northern California in the last few days—but what exactly is it? How common is it? Also, go ...

Two storm systems are expected to dump rain on Southern California beginning Tuesday evening, again raising fears of possible debris or mud flows in recent burn areas. The first “atmospheric river” ...

As Neotethys closed up, the oceanic crust went under the Eurasian continent. The continental portion of the Arabian plate, ...