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A hard freeze may occur with or without frost. Temperature criteria may vary slightly in some county warning areas. This product and its definitional criteria was consolidated into the Freeze Warning product in October 2024; hard freeze messaging can be incorporated into the body of the Freeze Warning product when appropriate. [32] [42]
Frost weathering is a collective term for several mechanical weathering processes induced by stresses created by the freezing of water into ice. The term serves as an umbrella term for a variety of processes, such as frost shattering, frost wedging, and cryofracturing.
Black frost (or "killing frost") is not strictly speaking frost at all, because it is the condition seen in crops when the humidity is too low for frost to form, but the temperature falls so low that plant tissues freeze and die, becoming blackened, hence the term "black frost".
A hard freeze is when temperatures are 28 degrees or lower for an extended period of time. Here's what you need to know.
The three main types of ground frost are radiation frost (), advection frost (advection hoar frost) and evaporation frost.The latter is a rare type which occurs when surface moisture evaporates into drier air causing its temperature at the surface to fall at or under the freezing point of water. [1]
Example of a periglacial landscape with both pingos and polygon wedge ice near Tuktoyaktuk, Northwest Territories, Canada. Periglaciation (adjective: "periglacial", referring to places at the edges of glacial areas) describes geomorphic processes that result from seasonal thawing and freezing, very often in areas of permafrost.
Frost heaving (or a frost heave) is an upwards swelling of soil during freezing conditions caused by an increasing presence of ice as it grows towards the surface, upwards from the depth in the soil where freezing temperatures have penetrated into the soil (the freezing front or freezing boundary).
Frost and cold weather can be particularly harsh on materials like wicker, upholstery, unsealed wood, plastic, and coated metal. Although many products are marketed as weatherproof, it's important ...