Grandma’s aching joints might indicate the arrival of a low-pressure system. She might also observe the geese flying lower than usual, confirming the low-pressure system. Finally, she might feel dampness on her skin, a sign of high humidity (湿度). Based on these three observations, grandma might warn that a storm is brewing.
Joints and nerves can indicate dropping air pressure, Dissolved gases in the blood form bubbles under low air pressure. This causes pain in joints and nerve endings. Geese and other birds respond to changes in air pressure by adjusting how high they fly. In the fair, calm weather of a high-pressure system, the birds fly higher than in the stormy weather associated with a low-pressure system.
Nature provides other clues to changing weather. A decrease in air pressure causes deer and elk to come down from the mountains to look for shelter. Some animals feed more than usual. The higher humidity before a storm causes some insects to leave the trees and gather near the ground. Some flowers close so rain doesn’t get inside them. In winter, rhododendron plants curl up to protect themselves as the temperature drops.
Several of the sayings apply in particular areas of the world. Here are some of them.
■Early thunder, early spring.
■Rainbow in the morning 8ives you fair warning.
■When teeth and bones and bunions ache, expect the clouds to fill the lake.
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