Effective Bulk Wind Difference (kts)

The magnitude of the vector wind difference from the effective inflow base upward to 50% of the equilibrium level height for the most unstable parcel in the lowest 300 mb. This parameter is similar to the 0-6 km bulk wind difference, though it accounts for storm depth (effective inflow base to EL) and is designed to identify both surface-based and "elevated" supercell environments. Supercells become more probable as the effective bulk wind difference increases in magnitude through the range of 25-40 kt and greater.

Additional information can be found here. (Please open this link in another browser window.)