In the Pilbara region of Western Australia, between the Hamersley and Chichester Ranges, lies an impermanent river. It is part of the catchment of the Fortescue River, which flows toward the Indian Ocean. In January 2012, heavy rains from Tropical Cyclone Heidi filled the normally dry riverbed near the towns of Wittenoom and Marillana. The Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Terra satellite captured these images on January 15, 2012 (top). These images use a combination of visible and infrared light to better distinguish between water and land. Water ranges in color from electric blue to navy. Vegetation is green. Bare ground is earth-toned. Clouds are pale blue-green. Separated by just nine days, these images show significant changes. The same river valley that is nearly dry on January 6 is filled with water on January 15. Besides watering ephemeral rivers, the storm hampered iron-ore production in Pilbara, according to news reports. |
January 27, 2012
A severe winter storm pummeled the Pacific Northwest in late January 2012, icing roads, downing power lines, and prompting avalanche warnings. On January 20, more than 250,000 customers were without electricity, as utility crews struggled to restore power, news sources said. Rising temperatures and potential new rainfall raised the possibility of flooding in the days that followed. Snow still blanketed much of Washington State on January 23, 2012, when the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Terra satellite captured these images. The top image is a natural-color scene similar to what our eyes would see from the sky. The bottom image is a false-color scene that better distinguishes between snow and clouds. Ice and snow are red. Liquid-water clouds are white, and ice clouds are peach. Vegetation is bright green. Snow blankets the region east of Seattle and Portland, stretching all the way to the Idaho border. In the band of forest along the Pacific Coast, snow may be more prevalent than it appears, as it is sometimes hidden from satellite imagers by trees. |
