I know that thundersnow, otherwise known as winter thunderstorm is rare because usually the lightning(which is as hot as 5 suns) melts all the snow produced into freezing rain or sleet. But sometimes the snow doesn't melt despite all the lightning. I have been outside looking at the weather for years. I have particularly looked for signs of a thunderstorm. Whenever I noticed strong gusts(sometimes strong enough to blow me a few inches if I wasn't prepared) and dark clouds I thought "This is going to become a thunderstorm." because I know how a thunderstorm forms. First water evaporates and transpires and forms cumulus clouds. These cumulus clouds then merge both horizontally and upwards to form cumulonimbus clouds. This is helped by wind and updrafts and is when you start feeling the wind picking up speed. As the clouds become more and more saturated with water droplets they darken. In fact the whole sky darkens. Once the cumulonimbus clouds reach the tropopause and form an anvil top lightning starts to strike at the ground. This is when you start hearing the thunder(basically a sonic boom from the lightning) and seeing the lightning. The water droplets are almost at the critical size of raindrops at this point. Several minutes later and it starts raining. There can be times of no rain in the middle of a thunderstorm, especially during the summer when it is hot. But often my predictions were wrong because there was no rain at all(I knew that from the ground being dry the next day). If I write a story where someone has to know when there is going to be a thunderstorm or any kind of storm for that matter because the person only has a wife and is just starting a civilization, how will that person be able to accurately predict when there is going to be a storm of some sort if I know the signs of a storm and yet when I predict that there is going to be a storm,often there isn't one?