Peter Sinks
Peter Sinks is located 8,100 feet (2,500 m) above sea level, in the Bear River Mountains about 20 mi (32 km) 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.
Geology
Peter Sinks lies within the Bear River Mountains of Northern Utah. Composed primarily of limestone and dolomite, water flowing through the groundwater system of the mountain range erodes portions of the material to create caverns by dissolving material within the carbonate rocks. Once these voids reach a large enough size the ground above will collapse into them to create sinkholes and other karst topography.
Peter Sinks is composed of two depressions formed this way. Three other sinkholes, South, Middle, and North, are located just east of Peter Sinks with U.S. Route 89 running through the North Sink. Erosion of these sinks was enhanced by the presence of faulting. Holocene seismicity and faulting in the Bear River Range is associated with the migration of the Yellowstone hotspot located under Yellowstone National Park which lies to the north of the region mainly in Wyoming.
Climate
Peter Sinks, sitting at an elevation of 8,164 feet or 2,488 metres, is a natural limestone sinkhole approximately one-half mile wide in diameter and has no valley outlet (referred to as dolines geologically) to drain water or air. It is one of the coldest spots in the contiguous United States.
During calm cloudless nights, this high elevation basin dissipates daytime heat rapidly into the atmosphere. Cool dense air can then slide downwards towards the basin floor in a process known as cold air pooling. Consequently, extremely low temperatures can occur, particularly in the wake of arctic fronts in winter. According to the Köppen climate classification, it has a continental subalpine climate, abbreviated Dsc, though the exceptional attributes of this climate preclude one of the hallmark features of the climate type, the boreal forest, which as Köppen based the system around vegetation distribution indicates that Peter Sinks stretches the limits of the system.
| Climate data for Peter Sinks, Utah, 2010–February 2015 average highs and lows, 2010–October 2019 average records, extremes 1985-present | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Record high °F (°C) | 49 (9) |
46 (8) |
54 (12) |
66 (19) |
70 (21) |
83 (28) |
83 (28) |
82 (28) |
77 (25) |
75 (24) |
62 (17) |
45 (7) |
83 (28) |
| Mean maximum °F (°C) | 41 (5) |
41 (5) |
49 (9) |
58 (14) |
65 (18) |
78 (26) |
82 (28) |
81 (27) |
76 (24) |
65 (18) |
51 (11) |
43 (6) |
83 (28) |
| Mean daily maximum °F (°C) | 28.7 (−1.8) |
29.1 (−1.6) |
37.5 (3.1) |
41.9 (5.5) |
50.5 (10.3) |
62.6 (17.0) |
73.8 (23.2) |
71.7 (22.1) |
63.9 (17.7) |
49.6 (9.8) |
34.4 (1.3) |
27.0 (−2.8) |
47.6 (8.7) |
| Daily mean °F (°C) | 12.3 (−10.9) |
11.4 (−11.4) |
20.4 (−6.4) |
25.9 (−3.4) |
36.1 (2.3) |
45.5 (7.5) |
54.8 (12.7) |
53.2 (11.8) |
45.4 (7.4) |
34.6 (1.4) |
20.1 (−6.6) |
11.5 (−11.4) |
30.9 (−0.6) |
| Mean daily minimum °F (°C) | −4.1 (−20.1) |
−6.2 (−21.2) |
3.3 (−15.9) |
9.9 (−12.3) |
21.7 (−5.7) |
28.4 (−2.0) |
35.9 (2.2) |
34.8 (1.6) |
26.9 (−2.8) |
19.7 (−6.8) |
5.8 (−14.6) |
−3.9 (−19.9) |
14.4 (−9.8) |
| Mean minimum °F (°C) | −40 (−40) |
−35 (−37) |
−31 (−35) |
−16 (−27) |
−1 (−18) |
18 (−8) |
23 (−5) |
20 (−7) |
12 (−11) |
−6 (−21) |
−26 (−32) |
−43 (−42) |
−47 (−44) |
| Record low °F (°C) | −66 (−54) |
−69.3 (−56.3) |
−52 (−47) |
−41 (−41) |
−19 (−28) |
3 (−16) |
13 (−11) |
7 (−14) |
−10 (−23) |
−45 (−43) |
−47 (−44) |
−57 (−49) |
−69.3 (−56.3) |
| Average precipitation inches (mm) | 5.53 (140) |
4.97 (126) |
4.57 (116) |
3.98 (101) |
3.56 (90) |
1.74 (44) |
0.91 (23) |
1.11 (28) |
1.85 (47) |
2.94 (75) |
4.21 (107) |
5.21 (132) |
40.58 (1,031) |
| Source: Oregon State University, The Weather Forums, The Washington Post (October record low) | |||||||||||||
Extreme cold
On February 1, 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. The lowest recorded temperature was −69.7 °F or −56.5 °C at Rogers Pass, Montana in 1954.
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 (−53.3 °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, and again on January 30, 2023, the temperature dropped to −62 °F (−52.2 °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 differ by as much as 70 °F (39 °C).
See also
References
- ^ "Peter Sinks". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. December 31, 1979. Retrieved January 4, 2024.
- ^ Painter, Karen (October 17, 2022). "Peter Sinks: One of The Coldest Temperatures Ever in The United States Recorded Near Logan, Utah". Utah Stories. Retrieved January 4, 2024.
- ^ Greene, Jack (July 8, 2019). "The Bear River Range and River". Wild About Utah. Retrieved January 4, 2024.
- ^ "Glad You Asked: Where is the Coolest Spot in Utah?". Utah Geological Survey. Retrieved January 4, 2024.
- ^ "Yellowstone and Snake River Plain". www.isu.edu. Retrieved January 4, 2024.
- ^ Beck, Hylke E.; Zimmermann, Niklaus E.; McVicar, Tim R.; Vergopolan, Noemi; Berg, Alexis; Wood, Eric Franklin (2018). "Present and future Köppen-Geiger climate classification maps at 1-km resolution". Scientific Data. 5: 180214. Bibcode:2018NatSD...580214B. doi:10.1038/sdata.2018.214. PMC 6207062. PMID 30375988.
- ^ "Time Series Values for Individual Locations". Oregon State University. Retrieved January 4, 2024.
- ^ "Peter Sinks, UT Climate". The Weather Forums. March 2, 2015. Retrieved August 14, 2020.
- ^ Cappucchi, Matthew; Samenow, John (October 30, 2019). "Exceptional October cold sets records in Intermountain West, while oozing eastward". The Washington Post. Retrieved August 28, 2020.
- ^ "Peter Sinks".
- ^ NCDC: January 2002 City/State Extremes (Wayback Archive)
- ^ Bauman, Joe (February 18, 2006), "Think it's cold here? Check out Sinks area", Deseret News, archived from the original on September 28, 2018
- Kirby, Robert (February 7, 2011), "Trail goes cold at Peter Sinks", Salt Lake Tribune
- Fahys, Judy (April 26, 2010), "Utah's extreme weather star had a workout this winter", Salt Lake Tribune
- Burgess, Kim (April 13, 2010), "Logan Canyon sets icy record", The Herald Journal
- Edwards, Alan (April 10, 2003), "USU student seeks out bone-chilling cold", Deseret News, archived from the original on October 23, 2012
- Palmer, Douglas (January 25, 1993), "U.S. 89 takes mighty cold turn at Peter Sinks", Deseret News, archived from the original on October 23, 2012
- Arave, Lynn (August 8, 1990), "Peter Sinks: Utah's coldest spot", Deseret News, archived from the original on October 23, 2012
- Arave, Lynn (August 8, 1990), "A summer visit to the kingpin of sinks", Deseret News, archived from the original on October 23, 2012
- Clements, Craig B.; Whiteman, C. David; Horel, John D. (June 2003), "Cold-Air-Pool Structure and Evolution in a Mountain Basin: Peter Sinks, Utah" (PDF), Journal of Applied Meteorology, 42 (6): 752–768, doi:10.1175/1520-0450(2003)042<0752:CSAEIA>2.0.CO;2
- Massey, Peter; Wilson, Jeanne (2007), "Northern Region Trail #7: Peter Sinks Trail", Utah Trails Northern Region, Adler Publishing, pp. 50–54, ISBN 978-1-930193-30-7
External links
- Peter Sinks - Utah Climate Center - real-time temperature monitoring of Peter Sinks and rim temperatures. Maintained by the Utah Climate Center
- Peter Sinks Temperature Monitoring Project - current project by Utah State University for onsite remote automated monitoring at Peter Sinks
- Peter Sinks Field Experiment by John Horel in 1999 - includes map and photos
- "The Coldest Places on Earth". Wunderground.com. January 19, 2011.