When it comes to word choices and writing, having various synonyms at your disposal can enhance the quality of your work. The commonly used phrase, "storm cloud," is no exception to this rule. There are a plethora of synonyms to describe the big, dark, menacing clouds that suggest a thunderstorm is on the way. Some of these synonyms include tempest cloud, thunderhead, cumulonimbus, anvil cloud, and cumulus congestus. Additionally, the phrase "gathering storm clouds" or "rolling storm clouds" can also be used to describe that foreboding feeling before a storm hits. Regardless of which synonym you choose, each of these words and phrases can paint a vivid picture of the impending weather and add depth to your writing.