What major factors affect if, and when, a storm will form?  What pushes it in a specific direction?  

After watching the video, give a brief explanation (1-2 paragraphs) of what conditions are required for a tropical storm (and eventually, a tropical cyclone) to form in the Atlantic Ocean. What major factors affect if, and when, a storm will form?  What pushes it in a specific direction?  What factor(s) influence its strength, and its path?

Essay should be 150-300 words.