NOAA IMAGE OF THE DAY
Tropical Cyclone 02A in the Arabian Sea
This "true color" image, captured using the NOAA/NASA Suomi NPP satellite's VIIRS instrument, shows Tropical Cyclone 02A moving westward across the Arabian Sea toward the coast of Oman.
According to the Joint Typhoon Warning Center, Tropical Cyclone 02A is located approximately 249 nautical miles southwest of Karachi, Pakistan, and, over the past six hours, has moved westward at 7 knots (or roughly 8 miles per hour). The storm is forecast to slowly intensify over the next 36 hours, followed by a turn toward the south and a period of significant weakening.
True color images are created using three of the VIIRS instrument's 22 channels -- RGB color channels 5, 4, and 3, which are sensitive to the red, green, and blue wavelengths of light respectively -- that measure different bands of the electromagnetic spectrum. Several other channels are also included to cancel out atmospheric interference, such as clouds and aerosols, which can cause a blurry picture.