Answer Key to HW6

Short Answer (6 points per question)
1) extreme winds
2) air mass thunderstorms
3) seven; three
4) zero degrees in latitude
5) mesoscale convective system
6) increases
7) sheet lightening
8) in a well-constructed building away from windows, preferably in 
   the basament
9) air mass thunderstorms
10) Doppler radar

Essay (20 points per question)
11) 
Nonsupercell tornadoes can form when the two outflow boundaries 
between two or more thunderstorms develop convergence and generate
strong rotation. Another development mechanism may be related to
strong convection along a convergence zone. The strong downward 
rotation from the cloud base can lead to tornadoes.  


12)
Named after the tornado specialist Theodore Fujita, the Fujita scale
is used to rank the intensity of tornadoes based on damage. The scale
has seven levels of intensity, from F0 to F6. The F6 tornadoes have 
not been documented in nature. The documented tornadoes are classified
as 3 categories, the "weak" category (FO and F1 tornadoes), the "strong" 
category (F2 and F3 tornadoes), and the "voilent category (F4 and F5). 

In the United States, most tornadoes fall into the "weak" category 
with about 69 percent.