Nested Grid Model generated every 12 hours by NCEP.

An instrument used for measuring geometric angles. See radio direction-finder.

See evaporative opportunity.

An aneroid barometer arranged so that the deflection of the aneroid capsule actuates a pen which graphs a record on a rotating drum. Sometimes called aneroidograph.

Solar radiation scattered by particles in the atmosphere.

In folklore, a name for wind.

The unit of force in the centimeter-gram-second system of physical units, i.e. one gm cm per sec2, equal to 7.233 x 10-5 poundal.

That horizontal wind velocity at which the Coriolis acceleration exactly balances the horizontal pressure force. It is directed along contour lines or isobars.

An instrument for measuring temperature by utilizing the variation of the physical properties of substances according to their thermal states. Thermometers may be classified into types according to their construction; deformation thermometer, electrical t ...

A temperature telemeter.

A common type of liquid-inglass thermometer, used, in meteorology, in psychrometers and as a maximum thermometer.

An instrument for determining the direction of cloud motion. There are two basic designs of nephoscope, the directvision nephoscope and the mirror nephoscope.

A fabric cone attached to a metal ring and used to indicate wind direction. often at airfields.

An instrument for measuring differences of electric potential.

A conically shaped, copper rain gauge shield.

A contact anemometer connected to an electrical circuit which is so arranged that the average wind speed is indicated.

A motorlike device containing a rotor and a stator and capable of converting an angular position into an electrical signal, or an electrical signal into an angular position. When several synchros are correctly connected, all of the rotors will align thems ...

Same as fogbow.

A wind blowing in a direction perpendicular to the course of a moving object.

A pressure-plate anemometer consisting of a plate which is free to swing about a horizontal axis in its own plane above its center of gravity. The angular deflection of the plate is a function of the wind speed. This instrument is not used for station mea ...