Weather happens every day, but only some days have storms. Storms vary immensely depending on whether they are composed of warm or cold air, coming off the ocean or off a continent, occurring in summe...Weather happens every day, but only some days have storms. Storms vary immensely depending on whether they are composed of warm or cold air, coming off the ocean or off a continent, occurring in summer or winter, and many other factors. The effects of storms also vary depending on whether they strike a populated area or a natural landscape. Thunderstorms are extremely common. They form when ground temperatures are high, ordinarily in the late afternoon or early evening in spring and summer.