Anemometer - An instrument that measures wind speed. The strongest wind speed ever recorded by an anemometer was 253 mph during the passage of a cyclone on Barrow Island, Australia back in April of 1996.

Hectopascal - The standard measurement for atmospheric pressure now adopted by the World Meteorological Organization for global weather charts. The millibar is still however a commonly used unit for measuring pressure. Conveniently, millibars are actually equal to hectopascals. The global average for sea level pressure is 1013 hectopascals or millibars.

Stratopause - The boundary or transition layer between the stratosphere and mesosphere. The stratopause is located around 30 miles above the surface of the earth.

Nephophobia - The irrational fear of clouds. This is derived from the Greek word for clouds, which is nephos.

Azores High - Also known as the Bermuda high, this is a large, persistent, atmospheric high-pressure center that develops over the subtropical region of the eastern North Atlantic Ocean. The position of this high will migrate between Bermuda and the Azores Islands throughout the course of a year.

Hail-Spike - A radar signature that can occur when severe hail is present in a thunderstorm. The signature is seen as a narrow line of weak reflectivity beyond the thunderstorm. Its occurrence is due to the way the radar pulse is scattered in many directions when it reaches large hailstones. This phenomenon is also referred to as the three-body scatter spike.

Hygrometer - An instrument designed to measure the water vapor content and relative humidity in the atmosphere. Leonardo da Vinci built the first version of a hygrometer back in the 15th century.