Weather Maps--The Surface Station Model and Surface Weather Maps

Ø  The Surface Station Model and Surface Weather Maps

̶        Temperature, pressure, moisture, and wind measurements are reported hourly at the surface (most are usually made 2 meters above the ground)

̶        Station Model:

·         Isobars: Lines of constant pressure

·         Pressure Gradient: Where pressure changes over distance

·         Temperature Gradient: rapid change in temperature with distance

·         Isotherms: Lines of constant temperature

The World of Seven Billion

National Geographic - The World of 7 Billion

The map shows population density; the brightest points are the highest densities. Each country is colored according to its average annual gross national income per capita, using categories established by the World Bank (see key below). Some nations— like economic powerhouses China and India—have an especially wide range of incomes. But as the two most populous countries, both are lower middle class when income is averaged per capita.