Science for beginners . Fig. 149.—Weather map of 7 a. m. (Central Time) December 5, 1906. 192 THE WEATHER cross the country. A study of the following charts will showhow. 201. The Weather Map; Pressure and Winds.—Figure147 shows the barometer readings and the wind directions ata large number of Weather Bureau stations over the UnitedStates, at 7 a. m. Central Time, Dec. 4, 1906. The figures ateach place give the barometer readings. Each solid line runs. Fig. 150.—Weather map of December 6, 1906. The heavy brokenline shows path of the Low; the small circles, its position on suc-cessive days. th
Science for beginners . Fig. 149.—Weather map of 7 a. m. (Central Time) December 5, 1906. 192 THE WEATHER cross the country. A study of the following charts will showhow. 201. The Weather Map; Pressure and Winds.—Figure147 shows the barometer readings and the wind directions ata large number of Weather Bureau stations over the UnitedStates, at 7 a. m. Central Time, Dec. 4, 1906. The figures ateach place give the barometer readings. Each solid line runs. Fig. 150.—Weather map of December 6, 1906. The heavy brokenline shows path of the Low; the small circles, its position on suc-cessive days. through places having the same pressure. That pressure ismarked at end of the line. The barometer is lowest overColorado, and highest over Ohio, Pennsylvania and Virginiaand northern Manitoba. In paragraph 152 we learned thatthe barometer measures the weight, or pressure, of the chart shows that on the morning of December 4th, 1906,the pressure was greater over Ohio than it was over the sur-rounding region. That greater pressure, or weight, crowdedthe winds outward away from Ohio, on all sides (the arrows THE GENERAL STGRM; A LOW PRESSURE AREA 193 point or fly with the winds). The same was true over north-ern Manitoba. (1) The winds, at the ground, always blowaway from high pressure. Over Colorado the pressure was low. It was higher on allsides of Colorado. That higher pressure surrounding Colo-rado crowded the winds towards Colorado fro
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