1. Ronald Reagan Washington National Airport under a heavy snow

    Blocking the way

    Every so often, a dome of upper-level high pressure sits in place for a few days, sometimes as long as several weeks. A major block can produce seemingly endless stretches of blazing heat or bitter cold. By the time it dissipates, it may leave behind a whole stack of broken weather records and an array of disastrous consequences.

    • Weather

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  2. 2,755 . . .

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  3. Aedes aegypti mosquito biting a human

    Special delivery

    A small but active group of discipline-crossing specialists are analyzing the response of disease transmission to temperature, moisture, and other atmospheric variables.

    • Climate

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  4. Ice sheets and climate change during the late Pleistocene

    New research that involves NCAR's Bette Otto-Bliesner questions conventional wisdom with regard to massive iceberg discharges in the North Atlantic Ocean during the last glacial period, pointing toward climate rather than ice sheet instability as a cause.

    • Climate

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