In meteorology, an undular bore is a wave disturbance in the Earth's atmosphere and can be seen through unique cloud formations. They normally occur within an area of the atmosphere which is stable in the low levels after an outflow boundary or a cold front moves through.
In hydraulics, an undular bore is a (weak) bore with a standing wave pattern at the downstream (subcritical) side.
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Famous quotes containing the word bore:
“A bore is a man who, when you ask him how he is, tells you.”
—Bert Leston Taylor (1866–1921)