Each number represents a range of several knots of wind. Cooperative Extensions are often run out of university Botany Departments. Latitude is comparable to the x-axis on a graph. As there are 360 degrees in a circle, longitude may range up to 180 degrees East or West. 180 degrees East and West, in fact, meet on the other side of the globe from Greenwich, at the International Date Line.
Longitude is comparable to the y-axis on a graph.
They make noises to warn other animals about where they are, and to find mates.