Updraft - A region of rising air within a thunderstorm.

Bomb - A mid-latitude extratropical cyclone that undergoes a surface pressure drop of 24mb or more during a 24-hr period. Nor'easters are the most common type of rapidly strengthening low pressure systems that can fit the criteria for a bomb low.

Nacreous Clouds - Nacreous clouds are rare and are rarely found too far south of the poles. They form at an impressive elevation between 68,000 to 100,000 ft where temperatures are at or below -108F. They appear as large thin discs which tend to reflect vivid colors. Due to their high elevations, they can only be seen when the sun is just below the horizon.

Absolute Zero - A temperature of 0 on the Kelvin scale equates to -273 degrees C or -460 degrees F. This is theoretically the lowest possible temperature as there is no molecular motion at this temperature. Researchers at NASA have cooled sodium gas to just above absolute zero in a vacuum chamber.

Trough - An sharpened zone of cyclonic wind change usually associated with a zone of lower pressure, and can occur many places without actually becoming a front (lee-side a mountain chain, behind frontal zones, etc)

Super-Typhoon - A tropical cyclone in the western pacific basin that is the equivalent of a category 3 or higher hurricane in the atlantic and eastern pacific basin

Storm Surge - A rise of the sea level alone the shore that builds up as a storm (usually a hurricane) moves over water. It is a result of the winds of the storm and low atmospheric pressures.