NOAA Image of the Day
Typhoon Megi Engulfs Taiwan
The Visible Infrared Imaging Radiometer Suite (VIIRS) instrument aboard the NOAA/NASA Suomi NPP satellite captured this image of Typhoon Megi around 0550 UTC on September 27, 2016.
Located about 82 nautical miles west-southwest of Taipei, Taiwan, Megi has tracked west-northwest at 11 miles per hour over the past 6 hours. The storm has maximum sustained winds of approximately 100 mph with gusts of 126 mph. Recent satellite images show the center of the storm emerging off the coast of Taiwan, into the Taiwan Strait. Megi is forecast to make landfall in eastern China within the next 12 hours. Following landfall, the storm is expected to weaken rapidly.
Although true-color images like this may look like photographs, they aren't. True-color imagery is created by combining VIIRS's color channels that are sensitive to the red, green and blue (or RGB) wavelengths of light. In addition, several other channels are often also included to cancel out atmospheric interference, such as clouds and aerosols, which can cause a blurry picture. RGB composites are used in a wide variety of applications, including the monitoring of severe weather, differentiating snow/ice and ash/smoke from cloud, or even the boundaries between warm and cold air masses.
Courtesy of NOAA Environmental Visualization Laboratory