October 10, 1951 — St. Croix Falls, Wisconsin
10:10 a.m. Engineer and pilot Joseph J. Kaliszewski, flying with copilot Jack Donaghue on a Skyhook balloon tracking mission for General Mills 10 miles east of St. Croix Falls, Wisconsin, notices a strange object crossing the sky from west to east, much higher and behind the balloon, which is at 20,000 feet. The UFO has a peculiar glow. It comes into sight at a slight dive, then levels off and slows down, makes a sharp left turn, climbs at an angle of 50–60° into the southeast with terrific acceleration, and disappears. It is seen for about 2 minutes. [Eberhart]
Record Card:
Statement:
Sources:
Richard Hall, The UFO Evidence, p. 56;
Brad Sparks, Blue Books Unknowns Catalogue, Case 481, p. 114;
Project Grudge Status Report No. 3;
NICAP, “The Kaliszewski Sightings”;