Hurricane Nora. Satellite image of Hurricane Nora off the coast of Baja California, Mexico. The hurricane is the swirl of clouds surrounding the dark hole (the eye) at lower right. The eye is comprised of relatively calm, cloudfree air at a very low pressure. Around this eye are very strong winds which blow at over 100 kilometres per hour. Hurricanes form in tropical regions and are caused by largescale evaporation and convection due to warm sea temperatures. The eastward movement of warm water in the Pacific (known an El Nino event) may cause more hurricanes to form off the American continents coast. Image taken on 22 September 1997 by the American GOES9 satellite.
