EF Scale
EF3
Max Wind136 mph
ΔPressure−80 hPa
Vortex Radius120 m
Controls
Physics
Angular momentum M = v·r = const
Pressure deficit: ΔP = −ρv²/2
Swirl ratio S controls multi-vortex structure. High S → multiple suction vortices orbit the main funnel, creating the most damage.
Formation
1. Horizontal wind shear → horizontal vorticity
2. Updraft tilts vortex vertical
3. Mesocyclone forms (2–10 km wide)
4. Dynamic pipe effect concentrates rotation
5. Funnel extends to surface