Montana State Map, United States

County boundaries and names, county seats, rivers. Original Scale 1:2,500,000 U.S. Geological Survey, 1972 limited update 1990
Source: U.S. Geological Survey

Por Carlos Solís
Montana Fires Animation

Wildfires in the western United States have consumed about 6 million acres of forestland, as of Aug. 25. In Montana alone, fires have consumed more than 600,000 acres and show no signs of letting up. Fire officials, calling this the worst fire season in 50 years, have asked for help in battling the blazes. President Clinton ordered U.S. Army troops from North Carolina and Kentucky to help combat the flames. This image animation is based on a time series of NOAA GOES-10 satellite data, extending from sunrise August 22 to the morning of August 23. That day began with haze stretching across Montana, with smoke and/or fog in the lower areas of the mountains where the fires have been burning. Much of the smoke is blown away to the east by prevailing winds, but by early afternoon the fires are producing more smoke. These images were produced using GOES-10 visible channels.
Source: Images and animation courtesy Marit Jentoft-Nilsen, NASA GSFC VisAnalysis Lab

Por Carlos Solís
Phytoplankton bloom in Spencer Gulf, South Australia

Summer in southern Australia is the dry season, and in this true-color MODIS image of South Australia and the Spencer Gulf from October 20,2001, the areas vegetation is losing much of the lushness it possessed in the winter rainy season (See image from September 19, 2001). In southern hemisphere summer, the high pressure systems that dominate the continents weather move south, and block the rain-bearing westerly winds. The resulting changes in seasonal rainfall are extreme. Many of the rivers are impermanent, and flow into dry or impermanent salt lakes, such as Lake Torrens (long, thin lake bed, roughly in the center of the image), and Lake Eyre (pink and white lake bed to the northwest of Torrens). Between the Eyre Peninsula (lower left) and the Yorke Peninsula further east lies the Spencer Gulf, showing the blue-green swirls that indicate a phytoplankton bloom. Australia gets less rainfall than any continent except Antarctica, and the low and seasonal flows contribute to problems with salinity and algal blooms in the continents surface waters.
Source: Jacques Descloitres, MODIS Land Rapid Response Team, NASA/GSFC

Por Carlos Solís