Satellite observations also detected the unusual heat. The map above
shows land surface temperature from April 26 to May 3, 2016, compared to
the 2000–2010 average for the same one-week period.
Red areas were hotter than the long-term average; blue areas were below average. White pixels had normal temperatures, and gray pixels did not have enough data, most likely due to cloud cover.
This temperature anomaly map is based on data from the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Terra satellite. Observed by satellites uniformly around the world, land surface temperatures (LSTs) are not the same as air temperatures. Instead, they reflect the heating of the land surface by sunlight, and they can sometimes be significantly hotter or cooler than air temperatures.
The intense heat coincided with a weather pattern called an omega block. A large area of high pressure stalled the usual progression of storms from west to east. In Alberta, that left sinking, hot air parked over the region while the block was in place. But even before the omega block emerged, seasonal data show that winter in Alberta was warmer than usual.
According to Robert Field, a Columbia University scientist based at NASA’s Goddard Institute for Space Studies, El Niño likely played a role in the warmth. The Virginia Hills fire in central Alberta (May 1998) burned under a similar El Niño phase. “That fire occurred under comparable fire danger conditions, part of which you can trace to El Niño,” Field said.
Fewer people were affected by the Virginia Hills fire, however, because it was located away from a large population center. In contrast, authorities ordered the evacuation more than 80,000 people from Fort McMurray.
http://go.nasa.gov/1SUoqaH
Red areas were hotter than the long-term average; blue areas were below average. White pixels had normal temperatures, and gray pixels did not have enough data, most likely due to cloud cover.
This temperature anomaly map is based on data from the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Terra satellite. Observed by satellites uniformly around the world, land surface temperatures (LSTs) are not the same as air temperatures. Instead, they reflect the heating of the land surface by sunlight, and they can sometimes be significantly hotter or cooler than air temperatures.
The intense heat coincided with a weather pattern called an omega block. A large area of high pressure stalled the usual progression of storms from west to east. In Alberta, that left sinking, hot air parked over the region while the block was in place. But even before the omega block emerged, seasonal data show that winter in Alberta was warmer than usual.
According to Robert Field, a Columbia University scientist based at NASA’s Goddard Institute for Space Studies, El Niño likely played a role in the warmth. The Virginia Hills fire in central Alberta (May 1998) burned under a similar El Niño phase. “That fire occurred under comparable fire danger conditions, part of which you can trace to El Niño,” Field said.
Fewer people were affected by the Virginia Hills fire, however, because it was located away from a large population center. In contrast, authorities ordered the evacuation more than 80,000 people from Fort McMurray.
http://go.nasa.gov/1SUoqaH
Heat Fuels Fire at Fort McMurray
Reviewed by Infohut24
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12:21:00 PM
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Reviewed by Infohut24
on
12:21:00 PM
Rating:
