It takes a sharp eye to find something positive in the wreckage of the worst swarm of U.S. tornadoes on record: the 1974 Jumbo Outbreak. Millions of Americans are safer in the air because of Fujita's subsequent analysis of microbursts and tools developed by NCAR and collaborators.

Three scientists at the National Center for Atmospheric Research who served as authors of the assessment will be available for interviews after the report is released.

In recent years, spring snow has vanished even more quickly than computer models and climate scientists had expected, posing a research challenge and a potentially serious risk for water supplies.

The Climate Data Initiative announced by President Obama will enable new industries to use climate data to enhance long-range decisions and planning.

Why seasonal forecasting can’t tell us with certainty what to expect this summer—and why we might soon have a stronger sense of what late 2014 and early 2015 are likely to bring to large parts of the globe.