| 11. | "' Stratocumulus Castellanus "'have stronger convective activity due to the presence of increasingly unstable air.
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| 12. | A few rumbles of thunder are possible in the unstable air mass near the Southeast Coast.
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| 13. | Such large aircraft can create unstable air in their wake because their wingtips throw off minitornadoes.
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| 14. | Thunderstorms are possible in eastern Washington and Oregon as the front pushes into more unstable air.
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| 15. | Rain cooled air plunging earthward, called downdrafts, accelerate in the unstable air mass that supports strong thunderstorms.
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| 16. | Additionally, " a strong low-level easterly flow which forced the moist unstable air up-slope on the hills.
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| 17. | Behind the storm, chilly, unstable air will be forced south over the Great Lakes and the Ohio Valley.
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| 18. | Soukhanov says, " but you'll find it on television, referring to boxes of very unstable air or hurricanes ."
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| 19. | Cool, unstable air will cover the Northeast as an unseasonably strong low-pressure area becomes nearly stationary over southeastern Canada.
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| 20. | They occur in highly unstable air and often have complex structures that include cirriform tops and multiple accessory clouds.
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