About: Peter Sinks

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dbo:abstract	Peter Sinks is a natural sinkhole in northern Utah that is one of the coldest places in the contiguous United States. Peter Sinks is located 8,100 feet (2,500 m) above sea level, in the Bear River Mountains east of Logan, within the Wasatch-Cache National Forest. Due to temperature inversions that trap cold nighttime air, it routinely produces the lowest temperatures in the contiguous United States. Even in the summer, the bottom of the sinkhole rarely goes four consecutive days without freezing. It is so cold near the bottom of the hole that trees are unable to grow. On 1 February 1985, a temperature of −69.3 °F (−56.3 °C) was recorded there, the lowest recorded temperature in Utah, and the second-lowest temperature ever recorded in the contiguous United States. Peter Sinks' meteorological significance was discovered by Utah State University student Zane Stephens in 1983. Stephens, along with the Utah Climate Center, placed measuring instruments in the valley in the winter of 1984. On February 1, 1985, Peter Sinks dropped to −69.3 °F (−56.3 °C), while another nearby valley, Middle Sink, located 3 miles (4.8 km) to the north-east, dropped to −64 °F (−53 °C). Stephens hiked into Middle Sink along with Burns Israelsen to record the temperature personally. He then flew into Peter Sinks in a KUTV television station helicopter with broadcasting meteorologist Mark Eubank. State climatologist Gayle Bingham also traveled to the area and confirmed the temperature. The alcohol thermometer being used was retrieved and sent to the Bureau of Standards in Washington, D.C. to confirm the temperature. Since 1985, Peter Sinks and Middle Sink have been studied extensively by Stephens and Tim Wright with the use of Campbell Scientific weather equipment. On January 29, 2002, the temperature dropped to −62 °F (−52 °C) at Middle Sink. Stephens and Wright's main study is the change in temperature through the inversion at these sites. These valleys act like a dam trapping cold air, with the coldest of the air settling to the bottom of the valley. Stephens and Wright have found that temperatures between the cold air "lake" and the warmer air above the valley can be different by as much as 70 °F (39 °C). (en)
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dbp:location	Peter Sinks, Utah, 2010–February 2015 average highs and lows, 2010–October 2019 average records, extremes 1985-present (en)
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dbp:source	The Weather Forums, The Washington Post (en)
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rdfs:comment	Peter Sinks is a natural sinkhole in northern Utah that is one of the coldest places in the contiguous United States. Peter Sinks is located 8,100 feet (2,500 m) above sea level, in the Bear River Mountains east of Logan, within the Wasatch-Cache National Forest. Due to temperature inversions that trap cold nighttime air, it routinely produces the lowest temperatures in the contiguous United States. Even in the summer, the bottom of the sinkhole rarely goes four consecutive days without freezing. It is so cold near the bottom of the hole that trees are unable to grow. (en)
rdfs:label	Peter Sinks (en)
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