The top schematics show horizontal maps of the surface temperature and wind fields associated with a tropical cyclone (left) and an extratropical cyclone (right). Colors indicate temperature (blue: 15°C=59°F, blue-green: 20°C=68°F, green: 25°C=77°F). Solid lines indicate surface wind speeds (34 kt=39 mph and 64 kt=74 mph). The bottom schematics show vertical maps of the pressure surfaces and circulation at the surface and tropopause.