定义 中文名称： 不稳定气团 英文名称： unstable air mass 定义： 在其底部具有温度直减率大于湿绝热直减率，甚至接近或超过干绝热直减率的静力不稳定气团。 应用学科： 大气科学（一级学科）；动力气象学（二级学科）
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National Weather Service meteorologist Scott Truett said the heavy "thundersnow" resulted from an unstable air mass, much like a thunderstorm.
BBC: 'Thundersnow' storm in US Midwest blamed for two deaths
"Thundersnow" accompanied the winter storm in parts of Kansas and Missouri, which National Weather Service meteorologist Scott Truett said is the result of an unstable air mass, much like a thunderstorm.
NPR: Winter Storm Blankets Great Plains With Snow
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