hot
The word "thunderstorm" is one word.
thunderstorm is a noun, and nouns do not have antonyms
"Thunderstorm" is a compound word because it is formed by combining two smaller words, "thunder" and "storm," to create a single word that represents a specific weather event.
The warm air mass is generally warmest, and thus most unstable, just ahead of the cold front.
Most of them are very small i guess, but the small severe thunderstorm can be very serious and deadly.
Hot
The opportunity for warm, sticky air is also more likely, but warm air alone cannot trigger thunderstorms.Thunderstorms need an unstable environment and enough moisture to make tall, large clouds and the cumulonimbus cloud that defines a thunderstorm.
a hurricane
Cold dense air often converges with warm, moist air to form a thunderstorm. The warm air rises and cools, creating instability and leading to the development of thunderstorm clouds.
A sea breeze may lead to a thunderstorm if the cool sea breeze forces warm air to rise which creates a convection cell that creates strong updrafts that lead to a thunderstorm. This is how a sea breeze may lead to the formation of a thunderstorm.
The climate was very warm.
tropical