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Sleet starts falling as small pieces of ice
TRUE
FALSE
TRUE
Sleet is a type of winter precipitation that consists of small, translucent balls of ice. It forms when snowflakes melt into rain as they fall through a layer of warm air and then refreeze into ice pellets before reaching the ground.
Sleet is a type of winter precipitation that consists of small, translucent balls of ice. It forms when snowflakes melt into rain as they fall through a layer of warm air and then refreeze into ice pellets before reaching the ground.
TmeltтАЛ>0┬░C тАФ Temperature condition for phase change from solid to liquid
TfreezeтАЛ<0┬░C тАФ Temperature condition for phase change from liquid to solid
The process begins with snow high in the atmosphere. As the snow falls, it encounters a warm air layer (above freezing) where it melts into rain. Subsequently, the rain droplets pass through a deep, sub-freezing layer near the surface, causing them to freeze into small ice pellets, typically less than 5 mm in diameter.
Sleet is also known as 'ice pellets'.
It differs from freezing rain, which remains liquid until it hits the ground and freezes on contact.
The depth of the sub-freezing layer must be sufficient to allow complete freezing of the raindrops.
Useful indicator of specific atmospheric thermal vertical profiles.
Less disruptive to road infrastructure compared to glaze ice (freezing rain).
Reduces traction on roads and surfaces.
Can cause minor damage to vegetation and sensitive outdoor equipment.
Meteorological forecasting models.
Hydrological water balance studies in cold climates.
Sleet is categorized by the World Meteorological Organization as a distinct form of frozen precipitation.
Option B is FALSE because sleet represents a completed freezing process before impact, distinct from freezing rain.
A is correct тАФ Sleet is formed when raindrops freeze into ice pellets while passing through a sub-freezing layer near the ground.
In hydrology exams, differentiate between 'Freezing Rain' (liquid at impact) and 'Sleet' (solid at impact) as they have vastly different impacts on surface runoff and structural icing.