For those like myself on limited budgets and so totally reliant on the free version, CAPE isn't included in the Predict Wind
software bundle. Sorry doesn't help you OP, I realise.
But perhaps I can offer a thought. For me the more forecasting models available the more difficult the task of making a decision to sail, to go or to wait. And I'm not the only one. I struggle with cognitive bias, that I think is put down to my desire or reluctance to do the trip. If I'm really keen and fizzing at the cork to go then I'll find a forecast that affirms that desire and so my take on the weather data presented will be favourableto going or if I'm not especially keen on the trip, then I conclude the opposite.
And I see others doing the same. Particularly when the the trip is a group thing. There's a cognitive dissonance going on. Because at the end of the day it's only a forecast, and, I'm also backing the
boat and crew to handle a bit of rough stuff, or I'm thinking nah, that's looking too tough, let's plan for a couple of weeks whilst this forecasted system passes over (and that will better suit my
work commitments e or whatever that I have concerns about being away on the trip)
So I guess what I am suggesting is that there is so much weather information we're sort of overloaded. So OP perhaps you're over thinking?
Predict Wind itself states "
CAPE is used by weather officials to understand what the potential might be for thunderstorms and how powerful those storms might become if they do materialize." So is CAPE a model that the amateur can use to advantage without relevant
training? For myself nope.
But at the end of the day the weather itself doesn't read any forecast, it does what it does. And for the sailor, really, all you can do is scratch your
head, ponder the forecast, and in reality take a chance. And if you experience a bit of bad weather use it as a
learning experience. At the end of the day your odds of getting killed are far higher travelling by car to the
boat than on the boat trip itself.