. Elementary physical geography . ranges, as well as some of an irregular na-ture. During the summer, cyclonic storms are less common,and they come at irregular intervals, and there may be longperiods of drought. These droughts occur when the cyclonicdisturbances are of moderate intensity, and the storm centersfar to the north, in the Canadian territory. During theseconditions, warm air is drawn in from the south towardthe storm center, and this raises the temperature but doesnot produce rain. Under favorable conditions, thunder-storms and tornadoes may arise during the passage of low-pressure
. Elementary physical geography . ranges, as well as some of an irregular na-ture. During the summer, cyclonic storms are less common,and they come at irregular intervals, and there may be longperiods of drought. These droughts occur when the cyclonicdisturbances are of moderate intensity, and the storm centersfar to the north, in the Canadian territory. During theseconditions, warm air is drawn in from the south towardthe storm center, and this raises the temperature but doesnot produce rain. Under favorable conditions, thunder-storms and tornadoes may arise during the passage of low-pressure areas. WEATHER AND CLIMATE. 127 In southern Canada, New York, and New England, theweather is very variable and irregular. In the winter, snow-storms occur, and these are sometimes very heavy, particu-larly in the northern part of the area. Over a large part ofthe region, storms are of sufficient frequency, and the coldsufficiently intense and uniform, to allow the snows to ac-cumulate during the winter and remain upon the ground. Fig. 63. Conditions of wind, pressure and temperature accompanying a cold wave,March 14, 1895. until spring. In the southern part of the district the snow-storms may change to rain, or they may be followed by warmweather, causing the winter thaws, as a result of theinblowing wind from the south, which is drawn toward thestorm center. Along the coast, cold east winds are oftendrawn from the ocean, particularly during storms. Thecold waves which often follow the storms, cover the landwith a blanket of very cold air (Figs. 63 and 64), through 128 PHYSICAL GEOGRAPHY. which ladiabion proceeds with ease, giving us our coldestwinter weather; but the cold is not so intense as in the dryinterior area of the northwest. In the summer, storms are less frequent and less violent;but still they produce an effect upon the weather. Whenthey are not intense, the warm air drawn in from the south,produces days of excessive heat and sultriness, during whichthunderstorms m
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