cold snap
The opposite of a heat wave. In the North when there is a cold snap it can fall far below zero degrees Fahrenheit and everything becomes very brittle and easy to snap or fracture, such as trees making cracking noises when they bend with the wind or your home's water pipes splitting.
Make sure you have some hats and blankets in your car in case you break down. We are going to have a huge cold snap this week.
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