A barometer is a scientific instrument that measures the pressure of the atmosphere. Sailors use this device to predict upcoming changes in the local weather patterns. A dropping needle usually indicates that a storm or rain is approaching the area. A navigator checks the barometer every hour to track the movement of weather fronts. This data helps the captain decide if it is safe to leave the harbor. Stable pressure usually means the current clear weather will continue for several more hours. Modern digital barometers can show a graph of pressure changes over a whole day. Accurate readings allow the crew to prepare the boat for high winds or rain.
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