The difference between El Niño and La Niña can be a huge one for U.S. weather and for global climate. A strong El Niño can nudge global temperatures upward for up to a year.

A study led by NCAR visiting scientist Erich Fischer analyzes regional climate simulations to project where heat-wave-related health risks will increase in Europe as Earth’s climate warms.

An evening baseball game brings a lesson on how temperature affects insects, and thus the behavior of insect-catching birds—in this case, a pair of western kingbirds.

The year 2010 brought a difficult and sometimes tragic few months of weather events—first the snowstorms and record cold that battered much of the Northern Hemisphere, then tornadoes and floods in the United States.

Their letter to the president of the University of Virginia supports a statement by the university's faculty and questions the Virginia attorney general's use of governmental authority.