| definition | |
|---|
| warning issued when the conditions are right for a tornado to develope. | |
| by international agreement, a tropical cyclone with maxium wind speeds between 38 and 74 miles per hour. | |
| by international agreement, a tropical cyclone with maximum wind speeds that do not exceed 38 miles per hour. | |
| a cold air mass that forms a high-latitude source region | |
| a front formed when a cold front overtakes a warm front. | |
| a zone of scattered clouds and calm averaging 20 kilometers in diameter at the center of a hurricane. | |
| the overtaking of one front by another | |
| snow showers associated with an air mass to which moisture and heat are added from below as the air mass traverses a large and relatively warm lake. | |
| a front along which a warm air mass overrides a retreating mass of cooler air | |
| a new generation of weather radar that can detect motion directly and hence greatly improve tornado and severe storm warnings. | |
| a large body of air that is characterized by a sameness of temperature and humidity. | |
| an air mass that orginates over the ocean. | |
| warm air gliding up a retreating cold air mass. | |
The Nine Planets 
Digits of Pi 
Multiplication Table
