Assignment 2 



Temperature, Humidity, and Precipitation Equipment 



Text: Pages 33 - 69 



Learning Objective: Recognize char- 

 acteristics of wind, and methods and 

 procedures used for obtaining and 

 recording wind observations. 



2-1. A sudden increase in the wind speed of at 

 least 15 knots and substained at 20 knots 

 or more for at least 1 minute defines a 



1. gust 



2. peak gust 



3. squall 



4. downdraft 



2-2. Which of the following characteristics of 

 wind may be included in wind speed? 



1. Squalls only 



2. Gustiness only 



3. Wind shifts only 



4. Squalls, gustiness, and wind shifts 



2-3. Cold frontal passages may be indicated by 



1. wind shifts 



2. pressure falls 



3. humidity increases 



4. temperature rises 



2-4. Wind direction is considered to be vari- 

 able when it fluctuates by how many 

 degrees? 



1. 30° or more 



2. 45° or more 



3. 50° or more 



4. 60° or more 



2-5. For observational purposes, how long 

 should you observe wind direction and 

 speed? 



1. One-minute average 



2. Five-minute average 



3. Ten-minute average 



4. Instantaneously 



2-6. Refer to Appendix VI in your text. 



Assuming that wind-measuring instruments 

 are NOT availiable, a wide range of wind 

 speeds can best be estimated by careful 

 observation of the 



1. smoke drift from high stacks 



2. effects on trees and leaves 



3. structural damage to buildings 



4. whistling sounds emitted by telephone 

 wires 



2-7, 



A wind of 105 knots from 250° should be 

 encoded and entered in columns 9 and 10 

 of an MF1-10 form as 



1. 



25 05 



2. 



30 05 



3. 



50 05 



4. 



75 05 



2-8. What does the notation "Q45" in column 11 

 of an MF1-10 form mean? 



1. Gusts have been observed during the 

 preceding 45 minutes 



2. Squalls have been observed during the 

 preceding 45 minutes 



3. Squalls, with peak speeds of 45 knots, 

 have been observed during the pre- 

 ceding 10 minutes 



4. Gusts, with peak speeds of 45 knots, 

 have been observed during the pre- 

 ceding 10 minutes 



2-9. When will peak gust and squall data be 

 reported on MF1-10 surface observation 

 forms? 



1. When either an AN/UMQ-5 or Type B3 wind 

 equipment is available 



2. When data from a RD-108 wind recorder 

 is available 



3. When either an AN/GMQ-29 or AN/GMQ-14 

 weather station is available 



4. When any type of wind equipment is 

 utilized 



