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 Jet stream Strong winds concentrated within a narrow band in the atmosphere. The jet stream often "steers" surface features such as front and low pressure systems. 
Jevons effect The effect upon the measurement of rainfall caused by the presence of the rain gauge.
Joe in folklore, a name for fire.
Jordan sunshine recorder A sunshine recorder of the type in which the time scale is supplied by the motion of the sun. It consists of two opaque metal semi-cylinders mounted with their curved surfaces facing each other. Each of the semi-cylinders has a short narrow slit in its flat side. Sunlight entering the slits falls on light sensitive paper which lines the curved side of the semi-cylinder. One semi-cylinder covers morning hours, the other afternoon hours.
Joule A unit of energy equal to 101 ergs or to 0.2389 calories.
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