Global Snow and Ice - April 2016
Beginning in November 2017, NCEI will use version 3 of the National Snow and Ice Data Center's (NSIDC) monthly sea ice extent index. All historical monthly sea ice extent values will be updated to version 3, but historical reports will not be updated. For additional information on the methodology changes and comparisons to version 2, please visit the National Snow and Ice Data Center.
NH Snow Cover Extent
|April 2016||Snow Cover Extent||1981-2010 Anomaly||Trend
(out of 50 years)
|million km2||million mi2||million km2||million mi2||million km2||million mi2||Year(s)||million km2||million mi2|
Data Source: Global Snow Laboratory, Rutgers University. Period of record: 1967–2016 (50 years)
During April, the Northern Hemisphere snow cover extent (SCE) was 27.91 million square km (10.78 million square miles), 2.31 million square km (890,000 square miles) below the 1981-2010 average. This was the smallest April SCE for the Northern Hemisphere in the 50-year period of record and 90,000 square km (30,000 square miles) smaller than the previous record set in 1968. April Northern Hemisphere SCE is decreasing at an average rate of 1.7 percent per decade. During April both the North American and Eurasian SCE were below average.
The April North American SCE was 12.43 million square km (4.80 million square miles), 610,000 square km (230,000 square miles) below the 1981-2010 average, the 11th smallest on record. This was the smallest April SCE for North America since 2012. The April North American SCE is decreasing at an average rate of 1.0 percent per decade. During the month, above-average snow cover was observed for parts of the Great Lakes and the Central U.S. Rockies and Great Plains. Below-average snow cover was observed across much of Alaska, the U.S. Northwest, as well as the Canadian Rockies and Prairies. The contiguous U.S. April SCE was the 19th smallest on record, Canada the 13th smallest, and the Alaska April SCE was record small.
The Eurasian SCE during April was 15.48 million square km (5.98 million square miles), 1.69 million square km (650,000 square miles) below average, and ranked as the fifth smallest on record. The Eurasian SCE during April is decreasing at an average rate of 2.2 percent per decade. Above-average snow cover was observed across parts of the Tibetan Plateau, southeastern Russia, Mongolia, and parts of the European Alps. Below-average snow cover was observed for much of Eastern Europe, including all of western Russia, northern Kazakhstan, Kyrgyzstan, and most of Japan.
Sea Ice Extent
The Northern and Southern Hemisphere sea ice extent product has been suspended due to a satellite sensor failure. More information is available from the National Snow and Ice Data Center (NSIDC).