SFC-1 km Vertical Shear Vector (kts)
Surface-1-km Vertical Shear is the difference between the
surface wind and the wind at 1-km above ground level. These data
are plotted as vectors with shear magnitudes contoured. 0-1-km
shear magnitudes greater than 15-20 knots tend to favor supercell
tornadoes.
Additional information can be found here. (Please open this
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