At 2:40 p.m., near Laurel, a funnel cloud was reported and confirmed by the National Weather Service office in Wakefield, but it will take several hours before damage resorts fully come in to determine if that storm, or the second cell, fully extended to the ground to produce a tornado.
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Dust kicked up by the winds of the parent thunderstorm, heavy rain and hail, and the darkness of night are all factors that can reduce the visibility of tornadoes. Tornadoes occurring in these conditions are especially dangerous, since only weather radar observations, or possibly the sound of an approaching tornado, serve as any warning to those in the storm's path. Most significant tornadoes form under the storm's updraft base, which is rain-free,[33] making them visible.[34] Also, most tornadoes occur in the late afternoon, when the bright sun can penetrate even the thickest clouds.[23]
Storm spotters are trained to discern whether or not a storm seen from a distance is a supercell. They typically look to its rear, the main region of updraft and inflow. Under that updraft is a rain-free base, and the next step of tornadogenesis is the formation of a rotating wall cloud. The vast majority of intense tornadoes occur with a wall cloud on the backside of a supercell.[70] 2ff7e9595c
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