A stationary front on a map is represented by a line containing alternating blue triangles and red semi circles. The ocean is the largest source of water vapor. Dew Points in Calif are usually in the 5O's as compared to the Gulf Coast, for instance, which is usually around 70 degrees. It turns out that the dewpoint temperature in coastal areas is generally the same as the temperature of the ocean from which the air passes. Thus, dewpoint temeperatures along the California coast are generally in the 50s and along the Gulf Coast in the 70s.
Relative humidity relates to condensation.
In the example below, city B has a higher relative humidity than city A because there is a smaller difference between the temperature and dewpoint at MIami than there is at Las Vegas. Perspiration is the body's attempt to cool itself. The body secretes water which evaporates and then cools the skin surface. If the relative humidity is too high, the sweat does not evaporate or evaporates slowly. Weather Map Symbols Check the handouts for the weather symbols we will be using in this class.