The fluctuation shown by the barographic record occurred immediately after 6 P.M., at the time of the passage of the tornado of Thursday, March 27, 1890, near Owensboro, Davies County, Kentucky. The distance of the barograph from the nearest point of the tornado can be approximated by the evidences of damage the tornado left, and did not exceed a mile and a quarter or a mile and a half. At this distance to the south-east of Owensboro there is a ridge 150 or 200 feet high, and a large brick house on top was unroofed and partially demolished. This is the first evidence of destruction in the vicinity of Owensboro, but previous to this the noise of the approaching tornado was plainly audible to persons on the streets of the town. Until reaching the ridge above mentioned, the tornado appears to have passed in the air, accompanied by a roaring sound, without doing any damage in its passage. From a point about twelve miles to the south-west a tornado passed over the latter city two hours later. The rate of progress of the cyclonic area of low pressure, as shown by the signal service map, was forty miles an hour. On the same day a parallel tornado passed about thirty miles to the south of Owensboro, near south Carrolton. There was none to the northwards.