STARR — IOWA THUNDER-STORMS. 89 



The storms of the 30th are very local, and apparently without con- 

 nection. The storms came, generally, from south, southeast, or south- 

 west. The observer at Adair reports "very curious bursting and 

 branching out lightning. The storm came from west and south, and 

 was very threatening until nearly at point of observation, then the wind 

 rose and blew as a south wind till the storm was over ; it then 'changed 

 to the northwest and blew for fifteen minutes with force of '4;' at 

 7 :o5 p. m. it changed in five minutes to southwest, with force of '4;' 

 after ten or fifteen minutes it changed to east, with force of '2.'" 



Hinrichs says of July: "Thunder-storms and rains frequent, but 

 generally very local. The temperature rose gradually from the nth to 

 the 17th, and from the 26th to the 29th. On these hottest days, heat- 

 storms, with rain, thunder and lightning, and locally high wind and 

 hail, set in, greatly lowering the temperature. Storm of the 17th was 

 most intense in southeastern Iowa; that of the 29th, in northeastern 

 portions of the State." 



Storms are reported in July for every date except the 6th, 7th, 15th, 

 18th, 23d, and 24th. 



July 1 st. Several local storms, in both forenoon and afternoon. 

 None show well-defined form or progressive movement. Rainfall was 

 heaviest at Monticello — 1.50 inches. 



July 2d. Storms local — heat-storms. Out of seventeen reports, only 

 one gives a wind as hard as force "3;" some report "no wind at all." 

 Greatest rainfall at Clinton — 0.59 inch. Moravia — "Revolving clouds, 

 rolling in every direction; upper strata white; lower strata dense." 



July 3d. A fairly defined storm seems to have passed across the 

 State from the southwest. Times of beginning of rainfall are : Tabor, 

 3:00 a. m. ; Bancroft, 6:30 a. m. ; Oskaloosa, 10:00 a. m. ; Cedar 

 Rapids, 11:45 A.M.; Amana, 11:50 a. m. ; Homestead, 11:55 A - M - '■> 

 Mt. Vernon, 12:50 p. m. ; Hopkinton, 1:00 p. m. ; Monticello, 1:20 

 p. m. ; Cresco, 1:30 p. m. ; Brush Creek, 1:40 p. m. ; Monona, 2:30 

 p. m. ; McGregor, 2 :45 p. m. From Tabor to McGregor is about two 

 hundred and seventy miles; time of passage by storm, eleven hours and 

 twenty minutes; rate of travel, thirty-five miles per hour. There was 

 no wind at Tabor; wind seems to have blown more and more as the 

 storm passed to the northeast. At Brush Creek, Monona, and 

 McGregor it is reported "high;" at Cedar Rapids, force "4." The rain- 

 fall varied. Tabor and Monona report over one inch; Amana, only 

 0.20 inch. Brush Creek reports "clouds very black; gale of wind, with 

 slight hail, at 1:40 p. m. ; storm went around to north and northeast 

 very heavy; rain at 1 =40 p. M. — 0.60 inch in ten minutes." 



[Proc. D. A. N. S., Vol. V.] 12 I April 5, 1888.] 



