88 DAVENPORT ACADEMY OF NATURAL SCIENCES. 



thunder was heard at Ft. Dodge at 2 130 a. m., the last at 3 : 30 a. m. ; 

 rain began at 3 : 00 a. m. Amana — "First thunder at 7 : 50 a. m., last 

 at 9:50." Davenport — "First thunder at 10:00 a. m. \ rain at 

 10:30 a. m." The heaviest rainfall was at Ft. Dodge — 0.50 inch. 

 Hail fell at five and one-half miles southeast of Des Moines. Mar- 

 shalltown reports "a storm from the south at 4 = 40 p. m., with 0.48 inch 

 rainfall and high wind." 



The 20th is well reported by thirty-six observers — two storms, ap- 

 parently, one in the forenoon, the other in the afternoon. The rain- 

 fall times of storm "A" are : Rock Branch, 12 : 30 a. m. ; Seney, 1 : 30 

 a. m. ; Orange City, 1:45 A - M - > Wesley Township, 2:00 a. m. ; 

 Auburn, 2:00 A. m. ; Ft. Dodge, 2:15 a. m. ; Concord, 2:45 a. m. ; 

 Smithland, 4:00 a. m. ; Cresco, 6:00 a. m. ; Monona, 6 : 00 a. m. ; 

 Brush Creek, 6:00 a.m.; Dysart, 6 :oo; (Glenwood, 6:05 a. m.; Ta- 

 bor, 6 :4o A. m.) ; McGregor, 7 :oo a. m. ; Monticello, 7 : 00 a. m. ; Mt. 

 Vernon, 7 : 10 a. m. ; Garnavillo, 7 : 15 a. m. ; Marshalltown, 7 : 30 a. 

 m. ; Homestead, 9:23 a. m. ; Amana, 9 : 25 a. m. ; Oskaloosa, 10 : 30 

 a. m. ; Albia, 1 1 : 20 a. m. ; Moravia, 12:10 p. m. These indicate a 

 well-defined storm moving east or southeast. The distance from Seney 

 to Moravia is about two hundred miles; the time taken, nearly twelve 

 hours; rate of travel, sixteen miles an hour. The wind was generally 

 reported at "2" or "3" in force. Hail fell at Seney from 3 :oo A. m. 

 to 3 :o5 a. m., where this was the "fiercest storm of the season; wind 

 very strong; lightning almost a continual Hash all through the storm." 

 At Moravia there was no wind. Storm "B" is reported that evening 

 by several observers coming from the southwest or west and passing 

 east. Rainfall began at Cresco at 3 : 40 p. m. ; at Muscatine at 8:00 

 p. m. The average duration of rainfall was one hour. The greatest 

 was at Monona : 0.50 inch; Muscatine, 0.47. Notes: Davenport — 

 "Sharp thunder and lightning in north during the evening, but rain did 

 not fall till in night." Cresco felt both the above, and had a third 

 storm at 5 : 30 p. m. ; "Distant thunder continuous throughout the day; 

 cleared oft" at night after 8 : 00 p. m. ; numerous small showers around 

 all afternoon and evening." Hinrichs reports "men plowing corn killed 

 by lightning, one in Madison County, one in Adams County." 



The 30th was stormy in much of the State. We were then in the 

 southeast quadrant of a well-marked "low," central over Dakota on 

 that morning. This area combined later with another area further 

 west. Low pressures to our northwest were fairly prevalent until July 

 5th, and storms are reported locally until that date. 



