SCP: Supercell Composite Parameter, derived using GEFS forecasts of 6-hourly
lower-level convective available potential energy, storm-relative helicity, and
bulk wind difference between 500 hPa and 10 m.
GEFS: 35-day forecasts with 31 ensemble members
>>> Days 8-10 forecasts
>>> Weeks 2 and 3 forecasts

Reference: Carbin, G. W., M. K. Tippett, S. P. Lillo, and H. E. Brooks, 2016:
Visualizing long-range severe thunderstorm environment guidance from CFSv2.
Bull. Amer. Meteor. Soc., 97, 1021–1031,
https://doi.org/10.1175/BAMS-D-14-00136.1.

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Contact: hui.wang@noaa.gov