Conditions for Snow
What is SNOW?
Water vapor in the air makes ice crystals around a tiny core and falls to the ground.
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Pre-requisite
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If there is a humid atmosphere at an altitude of 700 hPa, there is a high possibility of precipitation.
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800 m (925 hPa) temperature below zero.
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Thickness Map
2010. 1. 4. 9:00 (KST) 1000-700hPa thickness
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To distinguish the precipitation types (snow or rain), the 1000-500 hPa thickness map and the 1000-700 hPa thickness map are mainly used.
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At 1000-500hPa thickness map, 5,400m is the standard value for checking the form of precipitation. If the thickness is thinner than 5,400m, the precipitation type is snow, and if it is thicker than 5,400m, the precipitation type is rain.
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At 1000-700hPa thickness map, if the thickness is thinner than 2760m, the type of precipitation is snow, and if it is thicker than 2820m, the precipitation type is rain.
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The red part is a mixed area of rain and snow. Judging from the red part, the north is snow.
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Ground Temperature and Relative Humidity
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Due to the relationship between ground temperature and relative humidity, the lower the ground temperature and relative humidity, the higher the probability of snow.
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Relative humidity (%)
= ( present water vapor / saturated water vapor ) * 100
Data validated between January 2009 and March 2011