A device used to switch electrical current at a selectable setpoint temperature.

Anemometer which generates an electrical contact output with a frequency proportional to wind speed.

A technique for making winds aloft observations in which two theodolites located at either end of a baseline follow the ascent of a pilot balloon. Synchronous measurements of the elevation and azimuth angles of the balloon. taken at periodic intervals, pe ...

For a given cloud or cloud laver. the lowest level in the atmosphere at which the air contains a perceptible quantity of cloud particles.

Anemometer whicb measures wind speed by measuring the degree of cooling of a metal wire heated by an electric current. A type of cooling power anemometer.

The stage on a fixed river gauge at which it is necessary to begin issuing warnings or river forecasts if adequate precautionary measures are to be taken before flood stage is reached.

A modification of the dew cell used in radiosonde equipment.

Board that holds graph paper on which is plotted information obtained from a pilot-balloon observation.

(1) The ratio of the speeds of a chemical reaction at two temperatures differing by 10

A graphical representation of stage or discharge at a point on a stream as a function of time.

A self-recording psychrometer.

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 ...

A colloquial term in western Australia for a squall, associated with thunder, on the northwest coast in summer.

A white disk 12" or more in diameter which is lowered into the sea to estimate transparency of the water. The depths are noted at which it first disappears when lowered and reappears when raised.

The process by which water in plants is transferred as water vapor to the atmosphere. Also, the amount of water so transferred.

Precipitation caused by the ascent of moist air over an orographic barrier such as a Mountain range.

February 2nd. In American folklore, a day that is popularly supposed to provide the key to the weather for the remainder of the winter. Specifically, if the ground-hog upon emerging from its hole casts a shadow, it will return underground, thereby forebod ...

Wind with a speed between 56 and 63 knots (64 and 72 mph); Beaufort scale number 11.

A recording anemoclinometer.

An instrument for measuring the frost point of the atmosphere.