Improve thunderstorms possible pictogram

As mentioned by @francksteunou: "Hi Julian. There is another picto that is absolutely not convenient : « thunderstorm clouds possible ». Indeed it is very very very close to the « overcast picto » although they have very different meanings. Today where I live , I have this forecast with this picto for the whole morning, while the weather is absolutely 90% blue. Maybe there is a cumulonimbus somewhere around but it is very different from overcast. I think this situation should be represented with at least 50% of blue in the pictogram.With a more inflated than normal cloud possibly. The cloud cover of the meteogram was precisely at 54% during this period. Thanks."