n.— «The third form appears rather as horizontal than as vertical whirls. They appear to be what Dr. Hinrichs has called derechoes (from derecho, straight) and advance in the form of a horizontal roll of dust. The front extends in length as they advance, so that the territory they pass over is fan-shaped, instead of the strap-shaped area of the tornado proper.» —“Tornadoes: What They Are; Where and When They Occur” by Mark W. Harrington Los Angeles Times Apr. 16, 1893. (source: Double-Tongued Dictionary)