دسته‌بندی هواشناسی

Cap Cloud یا ابر کلاهی شکل

بسمه تعالی

ابرشناسی نواحی کوهستانی

Cap Clouds

7.1.4. Clouds that Form over Mountains

1. Foehn (Chinook) Wall Clouds

2. Chinook Arch Clouds

3. Rotor Clouds

4. Lenticular Clouds

5. Cap Clouds

6. Banner Clouds

7. Billow Clouds

8. Fractocumulus and Fractostratus Clouds

9. Jet Stream Cirrus

Cap Clouds. A cap cloud (figure 7.9) is a lenticular cloud that forms over a mountain peak with the cloud base below the peak's summit

A cap cloud is sometimes surmounted by a stack of lenticular clouds. Like lenticular clouds, cap clouds are stationary, forming as humid air is lifted over the peak. Also like lenticular clouds, they form when there is stable stratification, a smooth, nonturbulent flow, moderate to strong winds, and high humidity. Cap clouds are quite common in maritime mountain ranges where there is a good supply of low-level moisture, and they are often the precursors of moist air masses that approach the mountains. Changes in cloud coverage or thickness indicate the rate at which moisture is increasing and can aid in timing the approach of a storm.