In this Landsat 8 false-color image, Alaska's Funny River fire appears in neon orange. The image was captured on May 21, 2014.
Credit: NASA Earth Observatory image by Jesse Allen, using Landsat data from the U.S. Geological Survey.
Alaska's Funny River fire cuts across the landscape like a neon wound in a new satellite image of the state's Kenai Peninsula.
The fire began on May 19, likely as a result of an improperly extinguished campfire, state officials have said. As of yesterday (May 22), the fire had spread over 44,423 acres (180 square kilometers) and was 5 percent contained, according to the state's interagency incident management team.
The fire is within about 3 miles (4.8 km) of several subdivisions, and is being battled both by firefighters on the ground, by smokejumpers and by water-scooping aircraft. Air quality advisories have been issued for southcentral Alaska because of the smoke from the fire. So far, no homes have been consumed by the fire, and there are currently no evacuation orders in place.
Satellite imagery, however, makes the extent of the burn clear. The Landsat 8 satellite captured the Funny River fire in natural color on May 21, as well as in infrared light. The latter view reveals the layers of the fire in false color: Orange for flames, reddish-brown for burnt Earth, and light blue for smoke. Tustumena Lake is at the bottom of the image in royal blue, and Cook Inlet is to the left.
The mushroom-like structures within the smoke are pyrocumulonimbus clouds, according to NASA's Earth Observatory. These clouds are the fire's own weather: They form from superheated air rising over the fire. Pyrocumulonimbus clouds sometimes produce light precipitation, and sometimes are associated with lightning or hail.
According to a 2010 paper in the Bulletin of the American Meteorological Society, pyrocumulonimbus clouds are capable of pushing particles from smoke into the stratosphere, a phenomenon once blamed on volcanic eruptions.
In the natural-color image, the pyrocumulonimbus clouds rise above a carpet of smoke. Hot, dry weather has stoked forest fires in Alaska as well as Siberia this spring.
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