An instrument for collecting liquid water from the atmosphere.

An instrument which measures the rate of evapotranspiration. It consists of a vegetation soil tank so designed that all water added to the tank and all water left after evapotranspiration can be measured.

An instrument designed to measure the effect of sunlight on evaporation from plant foliage. It consists of a porous clay atmometer whose surface has been blackened so that it absorbs radiant energy.

The meteorological visual range, which can be estimated from the average extinction coefficient using the Koschmieder equation.

Abbreviation for precipitation-evaporation quotient.

The greatest distance at which it is just possible to see and recognize with the unaided eye (1) in the daytime, a prominent dark object against the sky at the horizon, and (2) at night, a known, preferably unfocused, moderately intense light source.

The change in barometric pressure within a specified period of time (typically 3 hours for meteorological observations).

A recording anemoclinometer.

An evaluation of upper air temperature, pressure, and humidity from radio signals received from a balloon- borne radiosonde.

Wind with a speed between 4 and 27 knots (4 and 31 mph); Beaufort scale numbers 2 through 6.

Operation mode of a communication circuit in which one end can only transmit and the other end can only receive.

Liquid water at temperatures colder than freezing.

Same as geostrophic wind level.

Same as constant-level balloon.

An instrument for recording ocean waves. Most recorders are designed for recording wind waves, that is waves of periods up to about 25 seconds, but some are designed to record waves of longer periods such as tsunamis or tides.

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 ...

Instrument used to measure the amount of water evaporated from the soil surface during a given time interval.

Any quantity, such as force velocity, or acceleration, which has both magnitude and direction at each point in space, as opposed to scalar which has magnitude only. Such a quantity may be represented geometrically by an arrow of length proportional to its ...

Same as aneroid barometer. Holostelic means wholly made of solids, while aneroid means devoid of liquid.

Quantitative Precipitation Forecast.