They usually rotate counterclockwise in the northern hemisphere, and clockwise in the southern hemisphere. The average tornado will last less than an hour. A Hurricane is a powerful whirling storm that measures up to several hundred miles in diameter. The eye of the hurricane is located in the center of the storm. The eye is very calm, which is completely opposite of the raging storm around it.
Hurricanes have very powerful winds.
In order for a storm to be considered a hurricane it must have sustained wind speeds of at least 74 mph. Weather Tools Rain Gauge - a tool used to measures the amount of precipitation that falls. The precipitation is collected in a container with a ruler to show the amount. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Thermometer - an instrument used to measure temperatures. Mercury inside the thermometer rises or falls as it expands or contracts from changes in temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . .