Wind with a speed between 22 and 27 knots (25 and 31 mph); Beaufort scale number 6.

Thermometer used for measuring the lowest temperature attained during a given interval of time, for example, a day.

The process by which one object becomes adhered to another by the binding action of ice.

The height ascribed to the lowest layer of clouds or obscuring phenomena when it is reported as broken, overcast, or obscuration and not classified as "thin" or "partial." The ceiling is termed unlimited when these conditions are not satisfied. ...

A strong wind characterized by a sudden onset, a duration on the order of minutes, and a rather sudden decrease in speed.

A sunshine recorder of the type in which the time scale is supplied by the motion of the sun. It consists of two opaque metal semi-cylinders mounted with their curved surfaces facing each other. Each of the semi-cylinders has a short narrow slit in its fl ...

Binary Coded Decimal. A coding system in which each decimal digit from 0 to 9 is represented by a 4-digit binary number.

See evaporation pan.

Same as contact anemometer.

A mercury barometer which measures atmospheric pressure by weighing the mercury in the column or cistern.

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

Same as river gauge.

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,

The process in which incident radiation is retained by a substance. A further process always results from absorption.

See photometer.

Nested Grid Model generated every 12 hours by NCEP.

Name sometimes given to a transmissometer.

An instrument of the aspiration condenser type which measures the concentration and mobility of small ions.

A water-temperature thermometer provided with an insulated container around the bulb. It is lowered into the sea on a line until it has had time to reach the temperature of the surface water, then withdrawn and read. The insulated water surrounding the bu ...

Radio Direction Finder.