74 LABORATORY MANUAL 



Select a map with a well developed low region. This 

 low region is called a cyclone or cyclonic area. Using 

 the scale of miles indicated on the map, find the approx- 

 imate width of this low region. How many states does 

 it cover? Can you tell in what direction it is moving? 

 What is the air pressure (barometric reading) at the 

 center of the low area ? ' How much would the barom- 

 eter rise in being carried from the center of the low to 

 the outer isobar of the area? What is the weather 

 condition over the low region? Study the direction of 

 the wind over the whole low area. To what conclusion 

 do you come as regards the direction of the wind in 

 the low region? About what is the average wind 

 velocity of this area? 



Select another map with a well developed high area, 

 having a number of isobars curving around the word 

 high. This region is called an anticyclone or anti- 

 cyclonic area. What is the air pressure at the center 

 of this high area? How much would a barometer fall 

 in being taken from the center of this high to the 

 center of an adjacent low area ? What is the weather 

 condition over the high area? Study the direction of 

 the wind over the high region. What is the difference 

 between the general direction of the wind over the 

 high and low regions? 



What is the general direction of the movement of the 

 high and low areas? Find out from some source how 

 rapidly they move. Study the isothermal lines. What 

 is their general direction? What is the lowest and 



