A wind scale adapted by the U.S. Forest Service for use in the forested areas of the northern Rocky Mountains (NRM). It is an adaptation of the Beaufort wind scale. The difference between these two scales lies in the specification of the visual effects of ...

The measurement and computation of wind speeds and directions at various levels above the surface of the earth. Methods include pilot balloon observations, rabals, rawin or rawinsonde observations, radar tracking, or acoustic sounding.

Same as pitot tube.

An elongated area of relatively low atmospheric pressure. Usually associated with and most clearly identified as an area of maximum cyclonic curvature of the wind flow. The opposite of a ridge.

See bimetallic thermometer.

A line drawn through geographical points having the same pluvial index.

An instrument for measuring the frost point of the atmosphere.

The value of the quantity measured, as indicated or otherwise provided by a measuring instrument.

Part of a computer word that has meaning in itself, often, a byte.

A line drawn through geographical points where a given seasonal biological event occurs on the same date.

A generic term for any machine that enables a human being to communicate with a computer.

Growth of a cloud or precipitation particle by the collision and union of a frozen particle with a super-cooled water drop.

A rotation anemometer in which the axis of rotation is horizontal. The instrument has either flat vanes (as in the air meter) or helicoidal vanes (as in the propeller anemometer). The relation between wind speed and angular rotation is almost linear.

A wind blowing in the same direction as the heading of a moving object. thus assisting the object's intended progress. The opposite of a head wind.

A reflecting type telescope with a 45

That stage, on a fixed river gauge, at which overflow of the natural banks of the stream begins to cause damage in any portion of the reach for which the gauge is used as an index.

The visibility along an identified runway, determined from a specified point on the runway with the observer facing in the same direction as a pilot using the runway. Compare to runway visible range.

The maximum rate at which precipitation can pass through the surface into the soil, for a given soil in a given condition.

Apparatus using the combined simultaneous action of a bimetallic thermometer and a hair hygrometer to move a needle in front of a divided scale. fts construction permits dew point variations to be indicated approximately.

Of or pertaining to rain.