Scientists find that an atmospheric pattern can foreshadow the emergence of summertime heat waves in the United States more than two weeks in advance.

Though Hurricane Sandy struck almost a year ago, the fearsome cyclone lives on within the circuits of supercomputers that are replicating its unusual evolution and track.

Four days of rainfall across Colorado’s Front Range produced massive flooding that’s marooned thousands, inundated key roads, and damaged countless homes and businesses. Just how rare was this event?

Just as forecasters now peg the odds of a busy Atlantic hurricane season months in advance, we might soon have outlooks that assess the risk of an active tornado season weeks or even months ahead of time.

To better predict where thunderstorms will rip across the central United States this spring, researchers are teaming a high-flying aircraft with fine-grained computer simulations.