Science for beginners . rom a to % c, d, in about 24 hours. And at St. Paul, whilethe storm center passed by on the south, St. Pauls wind shifted slowlyfrom A to £, O, D, in 24 hours. The winds always shift in asimilar manner on each side of the path of such a general storm. 206. Watching a Storm Go By; Review.—By looking overthe group of charts you will see that this storm caused cer-tain changes in weather at the places over which it changes were not alike at all places. They are worth THE GENERAL STORM: A LOW PRESSURE AREA 195 noticing, for all well developed storms cause somew
Science for beginners . rom a to % c, d, in about 24 hours. And at St. Paul, whilethe storm center passed by on the south, St. Pauls wind shifted slowlyfrom A to £, O, D, in 24 hours. The winds always shift in asimilar manner on each side of the path of such a general storm. 206. Watching a Storm Go By; Review.—By looking overthe group of charts you will see that this storm caused cer-tain changes in weather at the places over which it changes were not alike at all places. They are worth THE GENERAL STORM: A LOW PRESSURE AREA 195 noticing, for all well developed storms cause somewhat similarchanges in the regions over which they travel. If we studythese we will find many of our storms more interesting towatch. 207. A Passing Storm; How the Winds Changed.—Thecenter of the storm of December 4-6, 1906, passed directlyover Des Moines. To see how the winds changed during thosetwo days, both along the path of the storm center and in theregions on either side of the path, see Fig. 151. 1500 ^-^iie. Fig. 152.—Cross-section of a storm on December 5th along a linefrom Omaha to northern Xew York. The illustration shows a commonarrangement of clouds and air movements in the lower few miles ofair in such a storm. 208. A Passing Storm; How the Temperature Changed. —The temperature at all three places rose for a day or moreafter the morning of the 4th, reaching its highest point justbefore, or about the time, the storm center arrived (middayof 5th) ; then began to fall again shortly after the centerpassed, reaching its lowest a day or so later. 209. A Passing Storm; the Pressure Changes.—Thebarometer fell slowly at all three places while the storm wasapproaching; reached its lowest reading when the center wasnearest; and started to rise again after the center had passed. 196 THE WEATHER The barometer fell lower and faster at points along the stormtrack than it did at places side of the storm path. 210. A Passing Storm; How the Clouds Were Arranged
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