Science / Weather / Thunder: The sound emitted by rapidly expanding gases along the channel of a lightning discharge. Over three-quarters of lightning's electrical discharge is used in heating the gases in the atmosphere in and immediately around the visible channel. Temperatures can rise to over 10,000 ?‚°C in microseconds, resulting in a violent pressure wave, composed of compression and rarefaction. The rumble of thunder is created as one's ear catches other parts of the discharge, the part of the lightning flash nearest registering first, then the parts further away.
Thunder Adjective Synonyms: roll, reverberate, boom, roar, rumble, resound, explode, crash, crack, blast
Thunder Verb Synonyms: roll, reverberation, boom, booming, roar, roaring, pealing, rumble, rumbling, crash, crashing, crack, cracking, explosion, blast
Science / Weather / Air Mass Thunderstorm: A thunderstorm that is produced by convection within an unstable air mass through an instability mechanism. Such thunderstorms normally occur within a tropical or warm, moist air mass during the summe MORE
Science / Weather / Severe Thunderstorm: A thunderstorm with winds measuring 50 knots (58 mph) or greater, 3/4 inch hail or larger, or tornadoes. Severe thunderstorms may also produce torrential rain and frequent lightning. MORE