Tunderstorms usually have similar physical features but their intensity degree of development and associated weather to differ . thay are generally classified as Airmass and Frontal .
Air mass Thunderstorms
Air mass thunderstorms generally form in a warm , moist air and isolated or scattered over large area . they are usually caused by solar heating of the land which results in convection currents that lift unstable air and are most common during summer afternoons or in coastal areas at night . Air mass thunderstorms can also be caused by orographic lifting . although they are usually scattered along individual mountain peaks . they may cover large areas . they may be embedded in other clouds making them difficult to identify when approached from the Windward (the opposite of Lee ward ) side of a mountain . Nocturnal thunderstorms can occure in late spring and summer during the late night or early morning hours when relatively moist air exists aloft . they are usually found from the mississippi valley westward . nocturnal storms cover many square miles and their effects may continue for hours at a given location .
Frontal thunderstorms can be associated with any type of front . those which occure with a warm front are usually obscured by stratiform clouds . you should expect thunderstorms when there is showery precipitation near warm front . in a cold front the cumulonimbus clouds are often visible in a continuous line parallel to the frontal surface .
Note : Squall line is a narrow band of active thunderstorms which normally contains very severe weather and is often forms 50 to 300 miles ahead of front .
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