El Nino, La Nina, ENSO

Beneath the surface of the tropical Pacific, a deep pool of cool water has been sliding slowly eastward. This massive, slow-motion wave is a favorable sign that La Niña might develop.

Compared to March, parts of the tropical Pacific showed signs of cooling off in April 2016.

Currently, the risk of regional-scale tornado outbreaks is predictable only about 7 days in advance. But NOAA scientists report that sea surface temperatures in the tropical Pacific may provide a month or more of advance warning of an elevated risk for tornado outbreaks.

Temperatures across the tropical Pacific Ocean were warmer than average in March 2016.

Due to an unusually warm winter, Washington DC's famous cherry trees might reach peak bloom before the Cherry Blossom Festival begins on March 20.

Waters along the equator in the Pacific Ocean were warmer than average during February 2016, but cooler than they were in January, according to satellite observations.