The transmission of data collected at a remote location over communications channels to a central station.

A flower-like diagram indicating the relative frequencies of different wind directions for a given station and period of time.

Contraction for radiosonde observation.

Based upon damage patterns, classifies twisters into six categories of wind speed (F0 thru F5), ranging from 40 to 318 mph estimated wind speed.

The ratio of the actual amount of water evaporated into the atmosphere to the evaporative power. Also called relative evaporation.

An apparatus, used in studying soil temperatures, for measuring the total supply of heat during a given period.

A recording weight barometer.

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 form of data transmission in which the bits of each character are sent one at a time along a single communication path. Compare to parallel data transmission.

See photometer.

The difference between the solar radiation directed downward and upward; net flux of solar radiation.

Conditions to which a device is subjected, not including the variable measured by the device. See normal operating conditions, reference operating conditions.

A precipitation amount of less than 0.005 inches. Also, the record made by any self-registering instrument.

Wind with a speed between 41 and 47 knots (47 and 54 mph); Beaufort scale number 9.

Same as dew-point hygrometer.

A colorless and odorless gaseous element. The lightest and apparently the most abundant chemical element in the universe. However, it is found only in trace quantities in the observable portion of our atmosphere, only about 0.00005 percent by volume of dr ...

Quantitative Precipitation Forecast.

Precipitation of very small, white opaque particles of ice, fairly flat or elongated, with diameters less than 1 mm. The solid equivalent of drizzle.

Anemometer which measures wind speed by the speed of rotation of 3 or 4 hemispherical or conical cups, each fixed to the end of a horizontal arm projecting from a vertical axis. See condenser-discharge anemometer, contact anemometer. Compare to bridled-cu ...

A protective coating applied to circuits.