Split Thumb

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.[4] 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.[5] This peak's descriptive name was published in 1951 by the U.S. Geological Survey.[4] 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.[6]

Split Thumb
Split Thumb, south aspect
Highest point
Elevation5,523 ft (1,683 m) [1]
Prominence923 ft (281 m) [1]
Parent peakMount Wrather[2]
Isolation2.15 mi (3.46 km) [1]
Coordinates58°24′23″N 134°18′44″W [1]
Geography
Split Thumb
Location of Split Thumb in Alaska
LocationTongass National Forest
Juneau Borough
Alaska, United States
Parent rangeCoast Mountains
Boundary Ranges
Juneau Icefield[1]
Topo mapUSGS Juneau B-1
Geology
Type of rockgranite
Climbing
First ascentJuly 2, 1954
Easiest routeclass 5.4 Southeast arête[3]

Climate

Based on the Köppen climate classification, Split Thumb is located in a subarctic climate zone, with long, cold, snowy winters, and cool summers.[7] 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. Temperatures can drop below −20 °C with wind chill factors below −30 °C. The month of July offers the most favorable weather to view or climb Split Thumb.

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. Retrieved 2020-03-27.
  5. "Split Thumb Icefall". Geographic Names Information System. United States Geological Survey. Retrieved 2020-03-27.
  6. http://publications.americanalpineclub.org/articles/12195516200/North-America-US-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. ISSN 1027-5606.
Looking north at Split Thumb
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