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- A line on a chart connecting equal times of occurrence of an event. In a weather analysis, a sequence plotted on a map of the frontal positions at several different observation times would constitute a set of isochrones.
NOAA National Weather Service - Cite This Source - This Definition
- Air Transportable Mobile Unit, Barograph, Blowing, MAREP, MAROB, OBS, parameter, Reconnaissance Code, Voluntary Observing Ship Program, VOS