Thunder, and the storm that comes with it, is nearby if it crashes and bangs. It is far off if it rumbles like timpani, and very far away if you see only the lightning but hear nothing.
When barometric pressure starts falling, foul weather is approaching. The barometer falling 0.1 inch or more per hour says that a major storm is close.
When atmospheric pressure increases, the sea level is slightly lowered in the highpressure cell. When pressure is lower, the sea level is slightly higher. The changes are only in inches and fractions of inches.
Approximate number of statute miles a cold front moves in a day (more in winter, less in summer). Warm fronts move approximately 200 statute miles a day.
Avoid a storm’s center by tracking its movements in relation to your course by putting your back to the wind and pointing to the left; that’s where the center of the storm lies.
Rule of 1/12
Tides do not rise or fall at an even rate. Divide the tide’s range by 12. A change of 1/12 occurs in the first hour, 2/12 in the second hour, 3/12 in the third hour, 3/12 in the fourth hour, 2/12 in the fifth hour and 1/12 in the sixth.
The Weather Clock
If you’re in the Northern Hemisphere as you face the wind, and it changes in a clockwise direction, it is generally an indicator that fair weather is on the way. Counterclockwise movement means just the opposite.