Because stable air masses are, by nature, calm and free of violent disturbances, they are often marked by the appearance of stratiform clouds or fog. Stratiform clouds can be identified by their smooth, sheetlike nature and do not build vertically like clouds found in unstable air masses with convective activity.Click to see full answer. Furthermore, what are the characteristics of an unstable atmosphere?A) Turbulence and good surface visibility. B) Nimbostratus clouds and good surface visibility.Subsequently, question is, what conditions cause a stable air mass? To be “unstable”, the lowest layers of an air mass must be so warm and/or humid that, if some of the air rises, then that air parcel is warmer than its environment, and so it continues to rise. This is called moist convection. Simply so, what kind of weather is associated with stable air? Stable air means that the weather is likely to be calm. It may rain or snow slowly and steadily, it may be sunny, but the weather will not change quickly. Unstable air means that the weather might change quickly with very little warning. Unstable air leads to sudden thunderstorms.Which of the following are characteristics of a moist unstable air mass?Smooth air, poor visibility, fog, haze, or low clouds. What are characteristics of a moist, unstable air mass? A. Stratiform clouds and showery precipitation.
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