Category: Define

Heat Lightning Lightning that appears as a glowing flash on the horizon. It is actually lightning occurring in distant thunderstorms, just over the horizon and

Heat Wave A period of abnormally and uncomfortably hot weather. It could last from several days to several weeks. The Weather Channel uses the following

High Clouds A term used to signify cirriform clouds that are composed of ice crystals and generally have bases above 20,000 feet. The main types

High Latitudes The latitude belt roughly between 60° and 90° North and South. Latitude The location north or south in reference to the equator, which

High Pressure System An area of relative pressure maximum that has diverging winds and a rotation opposite to the earth’s rotation. This is clockwise the

Horizon One of several lines or planes used as reference for observation and measurement relative to a given location on the surface of the earth.

Humidity The amount of water vapor in the air. It is often confused with relative humidity or dew point. Water Vapor (H2O) Water in gaseous

Hurricane The name for a tropical cyclone with sustained winds of 74 miles per hour (65 knots) or greater in the North Atlantic Ocean, Caribbean

Hurricane Warning A formal advisory issued by forecasters at the National Hurricane Center when they have determined that hurricane conditions are expected in a coastal

Hurricane Watch A formal advisory issued by forecasters at the National Hurricane Center when they have determined that hurricane conditions are a potential threat to