metpy.calc.supercell_composite(mucape, effective_storm_helicity, effective_shear)[source]

Calculate the supercell composite parameter.

The supercell composite parameter is designed to identify environments favorable for the development of supercells, and is calculated using the formula developed by [Thompson2004]:

\[\text{SCP} = \frac{\text{MUCAPE}}{1000 \text{J/kg}} * \frac{\text{Effective SRH}}{50 \text{m}^2/\text{s}^2} * \frac{\text{Effective Shear}}{20 \text{m/s}}\]

The effective_shear term is set to zero below 10 m/s and capped at 1 when effective_shear exceeds 20 m/s.

  • mucape (pint.Quantity) – Most-unstable CAPE
  • effective_storm_helicity (pint.Quantity) – Effective-layer storm-relative helicity
  • effective_shear (pint.Quantity) – Effective bulk shear

array-like – supercell composite