What it takes to get a hard freeze warning

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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. 

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The latest research showsthey are not created by engine combustion, which was previously thought. The first requirementisthe clouds have tobe vertically thin. Researchersthen discovered thatthe cloudsusually formbeneath C-130 planes (shown below).Beneath the wings of these planestemperatures are around 14 degrees warmer than the rest of the plane and surrounding environment. Thistemperature difference creates adry punch of air falling from the sky evaporating the clouds beneath.