Generally, a measure of the departure of the mean daily temperature from a given standard, one degree day for each degree (

A device that allows a terminal or computer at one location to communicate with a terminal or computer at a distant location via wire or phone lines.

In general. the severe wind of an intense tropical cyclone (hurricane or typhoon). The term has no further technical connotation, but, unfortunately, is easily conftlsed with the strictly defined hurricane-force wind,

An accumulation of granular ice tufts on the windward sides of exposed objects that is formed from supercooled fog or cloud and built out directly against the wind.

An instrument used to measure the water vapor content of the air.

A vent used with pressure sensors to reduce the effect of wind on the pressure inlet. It is normally mounted remotely and connected to the sensor using airtight tubing.

Difference between the instantaneous wind velocity at a point and the mean wind velocity taken over a given time interval. Also called fluctuation velocity.

A rainbow of angular radius of about 50

Amount of solar radiation incident, per unit area and time, on a surface which is perpendicular to the radiation and is situated at the outer limit of the atmosphere, the earth being at its mean distance from the sun. It equals approximately 2.00 ly/ min ...

Liquid water at temperatures colder than freezing.

A method of winds aloft observation accomplished by tracking a balloon-borne radar target or radiosonde with either radar or a radio theodolite.

A magnetometer of the electromagnetic type which is used to measure the horizontal intensity of the earth's magnetic field.

A mercury barometer designed for use aboard ship. The instrument is of the fixed-cistern type (see Kew barometer). The mercury tube is constructed with a wide bore for its upper portion and with a capillary bore for its lower portion. This is done to incr ...

A definite portion of a stream channel, commonly taken between two gauging stations, but may be taken between any two specified points.

A radiosonde which is dropped by parachute from an aircraft for the purpose of obtaining soundings of the atmosphere below.

Temperature to which absolutely dry air would have to be brought in order for it to have the same density as moist air, considered at the same pressure.

See evaporation pan.

An instrument for the measurement of both solar and terrestrial radiation.

Radio Direction Finder.

A wave disturbance in airflow due to some barrier in the flow. i.e. a hill or mountain.