waterspout

Waterspout is a transparent English compound: water + spout. The word appeared in the fourteenth century, initially referring to a drainage spout or gutter that directed water. By the sixteenth century, it had been applied to the meteorological phenomenon: a rotating column of air that forms over water, producing a visible funnel that appears to be a spout of water connecting sea to sky.

The waterspout's visible funnel is condensation, not water lifted from the surface. Only the strongest waterspouts actually pick up significant amounts of seawater. Most are fair-weather waterspouts — relatively weak vortices that form beneath growing cumulus clouds. They are far less dangerous than their land-based cousins, tornadoes, though the visual impression is nearly identical. The word's descriptive error — implying that water is being spouted — has persisted because the visual is compelling.

Ancient and medieval sailors feared waterspouts as sea monsters or divine punishment. Pliny the Elder described them as columns connecting sea and sky. Mediterranean sailors fired cannons at them, believing the noise would break the vortex. (It did not.) The King James Bible uses 'waterspout' in Psalm 42:7: 'Deep calleth unto deep at the noise of thy waterspouts.' The translators in 1611 used a weather word for a spiritual metaphor.

Fair-weather waterspouts are common in the Florida Keys, the Adriatic Sea, and the Great Lakes. They typically last five to ten minutes and dissipate when they move over land. The more dangerous tornadic waterspout — a tornado that moves from land to water or forms from a severe thunderstorm over water — can sustain winds exceeding 100 mph. The same word covers both, though they are meteorologically distinct.