Severe Storms
Wind Shear Explained: Why Changing Wind With Height Shapes Severe Storms
How wind shear helps organize thunderstorms, supercells, squall lines, and tornado potential, plus why speed and direction changes both matter.
Quick answer: Wind shear is the change in wind speed or direction with height. It helps storms organize and can support rotating updrafts when other ingredients are present.
Speed and direction
Speed shear means wind gets stronger with height. Directional shear means wind turns with height.
Together they can help thunderstorms tilt and organize instead of collapsing quickly.
Storm organization
Shear can support supercells, bowing lines, and long-lived storm clusters.
Without enough shear, storms may be brief pulse storms even with strong instability.
Tornado context
Low-level shear can matter for tornado risk, but it must overlap with moisture, instability, lift, and storm structure.
Warnings depend on actual storms and observations, not shear alone.