Instrument for measuring the depth to which the soil is frozen.

A subtle, diumal component of the wind velocity leading to a diumal shift of the wind or turning of the wind with the sun, produced bv the east-to-west progression of daytime surface heating.

See bimetallic thermometer.

A class of instruments employed to determine the electric potential at a point in the atmosphere, and ultimately the atmospheric electric field.

A clock-driven device for recording the time of occurrence of an event or the time interval between the occurrence of events.

A wind blowing in a direction opposite to the heading of a moving object, thus opposing the object's intended progress; the opposite of a tailwind.

In the direction from which the wind is blowing.

An ice coating with a consistency intermediate between glaze and rime.

Complementary Metal-Oxide Semiconductor. A method of making silicon chips that results in low power consumption by the circuits.

A wind vane used to obtain the horizontal and vertical components of the wind.

General name for a type of instrument which measures the inclination of the wind to the horizontal plane. See bivane.

The indicating part of an instrument. For example, the hand of a watch or the meniscus of a mercury column.

The pressure exerted by the atmosphere as a consequence of gravitational attraction exerted upon the "column" of air lying directly above the point in question.

A unit measure of electrical conduction. The facility with which a substance conducts electricity, as represented by the current density per unit electrical-potential gradient in the direction of flow. Electrical conductivity is the reciprocal of electric ...

Clouds which cover between 6/10 and 9/10 of the sky. See Sky Terminology.

A general term to designate apparatus designed to observe the details of weather during thunderstorms.

A small balloon used to determine the height of the cloud base. The height can be computed from the ascent velocity of the balloon and the time required for its disappearance into the cloud.

The general term for anemometers operating on the principle that the heat transfer to air from an object at an elevated temperature is a function of the air speed. Examples are the hot-wire anemometer and the katathermometer.

Strong winds concentrated within a narrow band in the atmosphere. The jet stream often "steers" surface features such as front and low pressure systems.

American Standard Code for Information Interchange. A standard code used to represent data using 8 bits (7 data bits and I parity bit) per character.