Assignment 3 



Cloud, Visibility, Radar, and Satellite Equipment 



Text: Pages 70 - 122 



3-5. 



3-6. 



Learning Objective: Relative to 

 cloud and visibility observations, 

 recognize reportable values and 

 methods of determining clouds and 

 visibility, and entering these 

 observations on the MF1-10 form. 



3-1. Which of the following publications should 

 be used as the basic reference for cloud 

 classification and identification? 



1. International Cloud Atlas, 

 NA 50-1D-509 



2. Smithsonian Meteorological Tables, 

 NA 50-1B-521 



3. NAVWEASERVCOM INST 13952.1 ( ) 



4. Federal Meteorological Handbook No. 1 



3-2. Meteorologically speaking, obscuration of 3-7. 

 the sky would be caused by 



1. surface-based smoke 



2. a single layer of clouds hiding the 

 entire sky 



3. several layers of clouds hiding the 

 entire sky 



4. an aurora 



3-3. If a cloud layer at 3,000 feet covers 

 6/10 of the sky, and 3/10 of this sky 

 cover is transparent, what is this sky 3-8. 

 cover termed? 



1. Thin 



2. Opaque 



3. Transparent 



4. Partial obscuration 



3-4. Which of the following would be termed a 

 ceiling? 



1. A completely opaque "broken" cloud 



layer 3-9. 



2. A surface-based smoke obscuration of 

 9/10 of the sky 



3. An "overcast" cloud layer with 6/10 

 classified as transparent 



4. A layer of 5/10 cloud cover with bases 

 at 1,500 feet 



The ceiling measurement that is used when 

 the sky is totally obscured by smoke and 

 haze is the vertical distance from the 

 ground to the 



1. top of the obscuration 



2. bottom of the obscuration 



3. highest point that can be seen verti- 

 cally into the obscuration 



4. base of the layer of clouds immediately 

 above the obscuration 



An altocumulus cloud layer, even though 

 attached to a cumulonimbus cloud layer, 

 may be classified as a separate layer if 

 the layer base levels are 



1. different 



2 . the same 



3. surface based 



4 . thin 



Refer to table 5-1 of your text. In 

 estimating the amount of an advancing 

 cloud layer, it is determined that the 

 angular elevation of the forward edge is 

 63° and that of the rear edge is 27°. 

 What is the total sky cover? 



1. 0.1 



2. 0.2 



3. 0.3 



4. 0.4 



Refer to table 5-2 of your text. Which 

 of the following sky cover contractions is 

 used when surface-based obscuring phenomena 

 do NOT completely restrict vertical visi- 

 bility? 



1. X 



2. -X 



3. SCT 



4. -SCT 



If the observed ceiling value is 4,000 

 feet, it must be reported as 



1. 4,000 scattered, AGL 



2. 4,000 broken, AGL 



3. 4,000 broken, MSL 



4. 4,000 overcast, MSL 



15 



