Wind with a speed between 34 and 40 knots (39 and 46 mph); Beaufort scale number 8.

Any one of numerous devices for the measurement of either speed alone or of both direction and speed (set and drift) in flowing water.

The true freezing point of water. The temperature at which a mixture of air-saturated pure water and pure ice may exist in equilibrium at a pressure of one standard atmosphere.

The temperature registered by a thermometer with its bulb at the level of the tops of the grass blades in short turf.

Sustained winds greater than or equal to 40 mph or gust greater than or equal to 58 mph.

A combination cup anemometer and pressure-plate anemometer, consisting of an array of cups about a vertical axis of rotation, the free rotation of which is restricted by a suitable spring arrangement.

Air in motion relative to the surface of the earth. Almost exclusively used to denote the horizontal component.

A balloon designed to float at a constant pressure level. This may be accomplished by a pressure valve which controls the release of ballast so as to maintain flight above a selected pressure level until the supply of ballast is exhausted. See Moby Dick b ...

A unit of energy per unit area commonly employed in radiation theory. Equal to one gram-calorie per square centimeter.

A c.g.s. (centimeter-gram-second) unit of mass. Originally defined as the mass of 1 cubic centimeter of water at 4

Part of a computer word that has meaning in itself, often, a byte.

An instrument which measures the instantaneous rate at which rain is falling on a given surface. Also called a rate-of-rainfall gauge.

An addition to a rawinsonde system which allows determination of the slant range to the radiosonde.

An instrument for measuring snow hardness in terms of the resistance of snow to the pressure exerted by a disk attached to a spring-loaded rod, a gauge calibrated in pounds per square inch registers the amount of resistance. See Canadian hardness gauge.

The wind speed and direction at various levels in the atmosphere above the level reached by surface weather observations.

in folklore, a name for fire.

An instrument which measures evaporation by measuring the loss of water from a burette reservoir through a ceramic disc.

The height of the cloud base above the local terrain.

A halo consisting of a faint white circle passing through the Sun and running parallel to the horizon for as much as 360

An Instrument used to determine dew point.