A seasonal wind of persistent direction, characterized by a pronounced change in direction between seasons.

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.

An instrument used to measure and record earthquake vibrations and other earth tremors.

A graphical aid used in fire weather forecasting to calculate the degree of forest-fire danger (or burning index). Commonly in the form of a circular slide rule, the firedanger meter relates numerical indices of (a) the seasonal stage of foliage, (b) the ...

Sustained winds greater than or equal to 40 mph or gust greater than or equal to 58 mph.

A remote indicator for wind speed and direction used in conjunction with a contact anemometer and a wind vane. The indicator consists of a center light, connected to the contact anemometer, surrounded by eight equally spaced lights which are individually ...

Solar radiation of selected wavelengths.

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.

Movernent of water through the soil surface into the soil, or the quantity of water entering the soil. Infiltration is equal to the total precipitation less the losses due to interception by vegetation. retention in depressions on the land surface, evapor ...

A sudden brief increase in the speed of the wind, followed by a lull or slackening. Compare to peak gust.

The amount of precipitation captured by a rain gauge.

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 element directly responsive to the value of the measured variable.

The interval between the lower and upper measuring limits of an instrument, i.e. a thermometer with a range of -35 to 50

The difference between the solar radiation directed downward and upward; net flux of solar radiation.

Based upon damage patterns, classifies twisters into six categories of wind speed (F0 thru F5), ranging from 40 to 318 mph estimated wind speed.

A general term for atmospheric water in any of its forms, i.e. clouds, fog, hail, ice crystals, rain.

An instrument used for measuring the specific gravity of a liquid.

A unit of energy equal to 1.356joules.

Same as geostrophic wind level.