84 DAVENPORT ACADEMY OF NATURAL SCIENCES. 



instant reaches a narrow, long, extended belt of land like a tornado 

 track, but this belt of destruction is carried forward with great velocity 

 so as to gradually sweep over a large part of the State. Again, the 

 squall of summer is radically different from the blizzard of winter. 

 The squall comes, reaches us, and after a few minutes leaves us, mov- 

 ing onward in its general course toward the southeast; the blizzard 

 blows for hours, and even days. In the squall, but a limited amount of 

 air comes down from the northwest, a great roll of cold and dense air 

 falls upon us; in the blizzard, the entire atmosphere covering several 

 States is moving as one body toward the southeast." 



In June, we had a considerable number of local thunder-storms, but 

 few were marked by great rainfall or electrical disturbance. Local 

 storms are reported for every day except the 1st, 15th, 17th, 22d, 23d, 

 25th, 27th. Some of these were reported from only one station. In 

 but a few cases can the storms be shown to bear relation to a well- 

 defined "low" area to the northwest. From the 4th to the 9th, the 

 number of reports made show a disturbance the most marked on the 

 7th. A cluster of storms began on the nth, culminating on the 13th. 

 On the 1 8th we have a "squall," followed by storms on the 19th and 

 20th. The storms of the 20th are the most fully reported of the 

 month. On the 30th, a number of storms are reported. 



June 3d, 9:45 A. m., a storm struck Middle River P. O. It was 

 of brief duration, and passed from south to northeast. The light- 

 ning was very sharp, and two barns west of Winterset were struck; 

 one of them burned. In the afternoon, thunder-storms occurred 

 through the whole southern border of the State. The rainfall was very 

 small. The storm came from the southwest at all stations. 



June 4th and 5th. The isobares on the morning map of the 4th are 

 peculiarly bent, and suggest a feeble depression not represented. This 

 is more marked on the 5th, and it is possible that the storms of those 

 dates are connected with it. The reports of the 5th are the more 

 numerous. 



June 7th. The storm of the 7th lies in the southeast quadrant of a 

 well-marked "low." On the 5th we see it forming central over Idaho, 

 Wyoming, and Utah. On the 6th, it has moved to central, over Western 

 Dakota, Nebraska, Northern Colorado, and Wyoming. On the 7th 

 it went east, separating into two small areas, one of which stood 

 over Eastern Dakota and Northern Minnesota, with Iowa to the south- 

 east. 



On the 10th there are scattering reports of a morning storm in the 



