A hygrometer in which the sensitive element is a strand or strands of human hair, the length of which is a function of the relative humidity of the air.

A measure of the amount of "spin" (or rotation) in the atmosphere.

The number of cycles per second between the limits of a frequency band.

A recording magnetometer.

Wind with a speed between 48 and 55 knots (55 and 63 mph), Beaufort scale number 10.

In physics, any process in which the flux density (or power, amplitude, intensity, illuminance, etc.) of a "parallel beam" of energy decreases with increasing distance from the source. Attenuation is always due to the action of the transmitting medium its ...

An instrument for determining the dust content of a sample of air. Also spelled conimeter.

The depth below which the ground is saturated with water. No water table exists if the ground water is confined by an overlying impermeable stratum, as in the case of artesian ground water.

A temperature scale based on absolute zero. Same as Kelvin temperature scale.

A graphical representation of a frequency distribution. The range of the variable is divided into class intervals for which the frequency of occurrence is represented by a rectangular column. The height of the column is proportional to the frequency of ob ...

Same as marine rainbow.

A component of the wind (often using Cartesian coordinates. i.e. X and Y wind vectors). Also, an arrow representing wind velocity, drawn to point in the direction of the wind and with a length proportional to wind speed.

The average temperature of the air as indicated by a properly exposed thermometer for a given time period, usually a day, a month, or a year.

The processing of the form or mode of a signal so as to make it intelligible to, or compatible with, a given device.

An instrument for measuring the extinction coefficient in water.

The programs and instructions which direct a computer.

A type of wind vane having a split or V-shaped tail. The apex orients itself to the direction of the wind.

A very sensitive electrostatic electrometer for measuring small potential differences.

Integrated Flood Observing and Warning System. National Weather Service flood warning program.

Reduction of visibility by strong winds blowing across dry ground with little or no vegetation. Visibilities of 1/8 mile or less over a widespread area are criteria for a Blowing Dust Advisory.