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More information about CAPE and CSP can be found in the ECMWF Newsletter No.144 at http://www.ecmwf.int/sites/default/files/NL-144.pdf here (starts on page 27).
Further details and practical information about the EFI for CAPE and CAPESHEAR are also available in the help section below the EFI web charts, at sub-section entitled "EFI for CAPE and CAPESHEAR" here: test real-time EFI-related products.
Figure 1. EFI forecasts for A) CSP; B) CAPE; C) CSP where probability of precipitation above 1mm/24h is greater than 5%; D) CAPE where probability of precipitation above 1mm/24h is greater than 5%. The EFI signal disappears over a large part of Germany except the northern areas after filtering out EFI values where probability of precipitation above 1 mm/24h is less than 5%. Severe convection developed only over the northern parts of Germany, whilst oevr the rest of the country it stayed dry and sunny.