Hard Freeze warnings are issued to highlight situations where the freezing temperatures might cause damage to property.  When temperatures get to the mid 20s crops and tender plants die pretty easily.  Pipes burst at 20 degrees so when the forecast calls for temperatures in the mid twenties preparations should be made to protect exposed just in case it is a little colder than forecast. 

Anthony's Weather Quiz Answers 7

Published On: Dec 14 2012 05:57:39 PM CST   Updated On: Jan 07 2013 12:51:57 PM CST

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The latest research shows they are not created by engine combustion, which was previously thought.  The first requirement is the clouds have to be vertically thin.  Researchers then discovered that the clouds usually form beneath C-130 planes (shown below).  Beneath the wings of these planes temperatures are around 14 degrees warmer than the rest of the plane and surrounding environment.  This temperature difference creates a dry punch of air falling from the sky evaporating the clouds beneath.