A weather map is shown below: A map of USA is shown with cities San Francisco, Los Angeles, Chicago, Dallas, Miami, and New York marked. A curved line with triangles pointing down is shown between San Francisco and Los Angeles. A curved line with semicircles pointing up is shown on the right between Chicago and Dallas. Slanting z shaped lines are made near Los Angeles. Teardrop shapes are made near Chicago. A key is shown.

Based on the weather map, state the direction of the warm front. Using complete sentences predict the effect of the warm front on any one city shown on the map. Will this prediction always come true? Why or why not?