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Split Thumb

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Mountain in Alaska, U.S.
Split Thumb
Split Thumb, south aspect
Highest point
Elevation5,523 ft (1,683 m)
Prominence923 ft (281 m)
Parent peakMount Wrather
Isolation2.15 mi (3.46 km)
Coordinates58°24′23″N 134°18′44″W / 58.40639°N 134.31222°W / 58.40639; -134.31222
Geography
Split Thumb is located in AlaskaSplit ThumbSplit ThumbLocation in Alaska
Interactive map of Split Thumb
CountryUnited States
StateAlaska
BoroughJuneau
Protected areaTongass National Forest
Parent rangeCoast Mountains
Boundary Ranges
Juneau Icefield
Topo mapUSGS Juneau B-1
Geology
Rock ageLate Cretaceous
Rock typeGranitic
Volcanic arc/beltCoast Range Arc
Climbing
First ascentJuly 2, 1954
Easiest routeclass 5.4 Southeast arête

Split Thumb is a 5,523 ft (1,680 m) glaciated mountain summit located in the Boundary Ranges of the Coast Mountains, in the U.S. state of Alaska. The peak is situated near the southern periphery of the Juneau Icefield, 9 mi (14 km) northeast of Juneau, 2.15 mi (3 km) southeast of Nugget Mountain, and 4 mi (6 km) east of Heintzleman Ridge, on land managed by Tongass National Forest. Split Thumb is surrounded by the Lemon Creek Glacier to the west, and Norris Glacier to east. The Split Thumb Icefall is set on the east aspect of the peak. This peak's descriptive name was published in 1951 by the U.S. Geological Survey. The first ascent of Split Thumb was made July 2, 1954, by a Juneau Icefield Research Project party comprising Edward LaChapelle, Dick Hubley, Carlton Ray, Dr. Conrad Buettner, and Bob Goodwin.

Climate

Based on the Köppen climate classification, Split Thumb is located in a subarctic climate zone, with long, cold, snowy winters, and cool summers. Weather systems coming off the Gulf of Alaska are forced upwards by the Coast Mountains (orographic lift), causing heavy precipitation in the form of rainfall and snowfall. Winter temperatures can drop below 0 °F with wind chill factors below −10 °F. The month of July offers the most favorable weather to view or climb Split Thumb.

Gallery

See also

References

  1. ^ "Split Thumb, Alaska". Peakbagger.com. Retrieved 2020-03-27.
  2. "Split Thumb". Bivouac.com. Retrieved 2020-03-27.
  3. "Split Thumb - 5,523' Alaska". listsofjohn.com. Retrieved 2020-03-27.
  4. ^ "Split Thumb". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. Retrieved 2020-03-27.
  5. "Split Thumb Icefall". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. Retrieved 2020-03-27.
  6. "AAC Publications - North America, U.S., Alaska, Split Thumb, Juneau Ice Field".
  7. Peel, M. C.; Finlayson, B. L.; McMahon, T. A. (2007). "Updated world map of the Köppen−Geiger climate classification". Hydrol. Earth Syst. Sci. 11 (5): 1633. Bibcode:2007HESS...11.1633P. doi:10.5194/hess-11-1633-2007. ISSN 1027-5606.

External links

Boundary Ranges
Ranges
Mountains
Passes
Icefields
Parks
Coast Mountains of North America
Ranges
Mountains
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