The major features of the winter tornado during landfall are as follows. 1) The core radius (*) was constant with height (i.e., upright cylinder). On the other hand, it does decrease the low-level on land (i.e., funnel shape). 2) The low-level vorticity increased dramatically on land; it is associated with the low-level contraction of the core radius. On the other hand, the low-level maximum tangential velocity was nearly constant in the vicinity of landfall. 3) There was no tilt of the vortex with height on the sea, while on land, there was a rearward-tilt with height. 4) The radar reflectivity images indicate that a well-defined hook echo on the sea. It was transformed to a more complicated shape on land. The tornado circulation had a spiral structure spiraling outward from the eye.
(*) the radius of the tornado's maximum tangential velocity from Doppler velocity