. The aviation pocket-book for 1918; a compendium of modern practice and a collection of useful notes, formulae, rules, tables and data relating to aeronautics . strong winds, rough, unsettled w^eather,and a temperature low^ in summer and high in winter. The windsblow spirally towards the low-pressure area in an anti-clockwisedirection. Tlie motion, as a rule, is from west to east. An anticyclone is a definite area of high pressure : characterisedby liglit airs and calms, dry, hazy, or foggy weather, and a tempera-ture higli in summer and low in winter. Tlie Avinds blow outwardsfrom the high-p
. The aviation pocket-book for 1918; a compendium of modern practice and a collection of useful notes, formulae, rules, tables and data relating to aeronautics . strong winds, rough, unsettled w^eather,and a temperature low^ in summer and high in winter. The windsblow spirally towards the low-pressure area in an anti-clockwisedirection. Tlie motion, as a rule, is from west to east. An anticyclone is a definite area of high pressure : characterisedby liglit airs and calms, dry, hazy, or foggy weather, and a tempera-ture higli in summer and low in winter. Tlie Avinds blow outwardsfrom the high-pressure area in a clockwise direction. It lias nogeneral direction of motion. The centre of a cyclone is a general area of ascending air currents,and that of an anticvclone of descending air currents. 246 METEOROLOGICAL DATA DIV. IX. CXCLOM\CCOND\TI0r>t5. ISOBARS Are driwn (or !iit<-rv»is nt ftve milli- WEATHER. !i i»;)■? (oliowirgsjmbnis — «;^„ I, »t,o«„ b. arralc 0-12, is indi /n>l overcast »1(T A ram fiillinii catcd bj the number of feather,. IIU • *Caira / \ in dfgrco3 Jahr.;iihcit. f. r>verc.,t .1., # . SDOMT. A hail. = fog tuist, T thunder. T? thunderstorm DIV. ix] WEATHER FORECASTS 247 The intervals between the isobars usually correspond to diflFer-ences in pressure of one-tenth of an inch. A cj^clone with crowdedisobars always has strong winds ; when the isobars are widelyspaced the winds are gentle. Cyclones are usually preceded by rising temperature, and accom-panied by cloudiness, and rain or snow. Anticyclones are usually preceded by falling temperature, andattended by fair weather. Forty-eight hours is about the present limit of the
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectaeronautics, bookyear
