A plastic molding component formed by the reaction of phenol and formaldehyde. It can be heavily reinforced or "filled" with glass fibers or other materials. Phenolics are known for their high impact strength, excellent wear characteristics, and dimension ...

Same as water year.

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

Same as photometer.

An instrument which measures the effective terrestrial radiation. See Angstrom pyrgeometer.

A photoelectric spectrophotometer which is used in the determination of the ozone content of the atmosphere.

A thin metal disc partially evacuated of air used to measure atmospheric pressure by measuring its expansion and contraction.

Very small precipitation drops (diameters less than 0.5 mm) that appear to float with air currents while falling in an irregular path. Unlike fog droplets, drizzle falls to the ground.

The audio-frequency signal transmitted by the Diamond-Hinman radiosonde when the baroswitch pen passes each fifteenth contact of the commutator, up to a number determined by the design of the commutator, and each fifth contact thereafter. This signal is t ...

The degree of conformity of an indicated value to an accepted standard value, or ideal value. See accuracy rating, measured accuracy.

Winds which, over a small area, differ from those which would be appropriate to the general pressure distribution.

An instrument which records the duration of sunshine and gives a quantitative measure of the amount of sunshine by the action of the sun's rays upon blueprint paper. A type of sunshine recorder.

A common type of terrestrial scintillation; shimmering over a hot surface (such as a roadway) on a quiet, cloudless. summer day.

Line drawn through geographical points recording equal amounts of precipitation during a given time period or for a particular storm.

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

A definite portion of a stream channel, commonly taken between two gauging stations, but may be taken between any two specified points.

The stage, on a fixed river gauge, corresponding to the top of the lowest banks within the reach for which the gauge is used as an index. Compare to flood stage.

American Standard Code for Information Interchange. A standard code used to represent data using 8 bits (7 data bits and I parity bit) per character.

A polarimeter utilizing a Wollaston prism as a polarizer and a Nicol prism as an analyzer.

Wind with a speed between 28 and 55 knots (32 and 63 mph); Beaufort scale numbers 7 through 10.