Weather patterns

1. when a colder air mass moves towards a warmer air mass a ____ front forms 232
4. air masses that form over land are referred to as _____ air masses 230
7. large bodies of air that have uniform temperature, humidity, and pressure 230
8. a ____ front not only brings warmer temperatures, but it also causes the wind to shift directions 233
9. a weather ____ is a boundary between two air masses 232
12. more Tornadoes occur here than anywhere else in the world 235
13. a low-pressure system is a large body of circulating air with low pressure at its center and higher pressure ______ of the system 229
14. continental tropical air masses usually form during the _____ 231

2. ______ are air currents moving vertically toward the ground 234
3. Strong updrafts and downdrafts within a ________ cause millions of tiny ice crystals to rise and sink 234
5. a violent, whirling column of air in contact with the ground 235
6. hurricanes do not form over_______ 236
10. an intense tropical storm with winds exceeding 119 km per hour 236
11. a high-pressure system is a large body of circulating air with high pressure at its ____ and lower pressure outside of the system 228