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In the weather, we can see positive feedback when a series of hot, sunny days create a static high pressure system which keeps storms from moving in to cool things off.
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Northern states including Minnesota, Wisconsin and North Dakota are closer to normal rainfall levels as a high pressure system over the middle of the country pushed wet weather northward during the last month.
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But forecasters also said the path of the storm will depend on a high-pressure system over the southern United States.
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For example, a car could gently increase the gas-pedal spring pressure when the speed is too high -- the navigation system knows how tight that upcoming curve is, remember -- or apply a light twist to the steering wheel if the car is drifting off course.
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By juggling heat, pressure, expansion and compression, the system can generate both high heat and high temperatures.
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