Explanation and limitations of study plot stability indices for forecasting dry snow slab avalanches in surrounding terrain

Abe, 2001, Creep experiments and numerical simulations of very light artificial snowpacks, Ann. Glaciol., 32, 39, 10.3189/172756401781819201 Atwater, 1954, Snow avalanches, Sci. Am., 190, 26, 10.1038/scientificamerican0154-26 Bartelt, 2002, A physical SNOWPACK model for the Swiss Avalanche Warning. Part I. Numerical model, Cold Reg. Sci. Technol., 35, 123, 10.1016/S0165-232X(02)00074-5 Birkeland, 2001, Spatial patterns of snow stability throughout a small mountain range, J. Glaciol., 47, 176, 10.3189/172756501781832250 Blattenberger, 1995, The road closure decision in Little Cottonwood Canyon, 537 Blöschl, 1999, Scaling issues in snow hydrology, Hydrol. Process., 13, 2149, 10.1002/(SICI)1099-1085(199910)13:14/15<2149::AID-HYP847>3.0.CO;2-8 Brown, 2006, Evolving shear strength, stability and snowpack properties in storm snow, 15 Brown, 2001, Modeling the changes in microstructure of snow during metamorphism, Cold Reg. Sci. Technol., 33, 91, 10.1016/S0165-232X(01)00032-5 Buser, 1987, Avalanche forecast by the nearest neighbour method, vol. 162, 557 Campbell, C., 2004. Spatial variability of slab stability and fracture properties in avalanche start zones. M.Sc. Thesis. Dept. of Civil Engineering, University of Calgary, Canada. Canadian Avalanche Association, 2002 Colbeck, 1990, The international classification of seasonal snow on the ground Conway, 1984, Snow stability index, J. Glaciol., 30, 321, 10.1017/S002214300000616X Conway, 1999, Evolution of snow slope stability during storms, Cold Reg. Sci. Technol., 30, 67, 10.1016/S0165-232X(99)00009-9 Dexter, L.R., 1986. Aspect and elevation effects on the structure of the seasonal snowcover in Colorado. Ph.D. Thesis, Dept. of Geography, University of Colorado, USA. Duncan, 1996, State of the art: limit equilibrium and finite-element analyses of slopes, J. Geotech. Eng., 122, 557, 10.1061/(ASCE)0733-9410(1996)122:7(577) Endo, 1991, Time variation of stability index in new snow on slopes, 85 Feick, S., Kronholm, K., Schweizer J., in press. Field observations on spatial variability of surface hoar at the basin scale. J. Geophys. Res., 112. doi:10.1029/2006JF000587. Föhn, 1987, The stability index and various triggering mechanisms, vol. 162, 195 Gauer, 2001, Numerical modeling of blowing and drifting snow in Alpine terrain, J. Glaciol., 47, 97, 10.3189/172756501781832476 Greene, 2004 Gubler, 1982, Strength of bonds between ice grains after short contact times, J. Glaciol., 28, 457, 10.1017/S0022143000005050 Haegeli, 2001, A new perspective on computer-aided avalanche forecasting: scale and scale issues, 66 Haegeli, 2003, Avalanche characteristics of a transitional snow climate — Columbia Mountains, British Columbia, Canada, Cold Reg. Sci. Technol., 37, 255, 10.1016/S0165-232X(03)00069-7 Haegeli, 2004, Hierarchy theory as a conceptual framework for scale issues in avalanche forecast modeling, Ann. Glaciol., 38, 209, 10.3189/172756404781815266 Hayes, 2005, A simple model of snow slope stability during storms, 165 Hachikubo, 1997, Effect of wind on surface hoar growth on snow, J. Geophys. Res., 1002, 4367, 10.1029/96JD03456 Holtz, 1981 Isaaks, 1989 Jamieson, J.B., 1995. Avalanche prediction for persistent snow slabs. Ph.D. Thesis, Dept. of Civil Engineering, University of Calgary, Canada. Jamieson, 1993, Shear frame stability parameters for large scale avalanche forecasting, Ann. Glaciol., 18, 268, 10.1017/S0260305500011630 Jamieson, 1999, Snowpack factors associated with strength changes of buried surface hoar layers, Cold Reg. Sci. Technol., 30, 19, 10.1016/S0165-232X(99)00026-9 Jamieson, 2001, Evaluation of the shear frame test for weak snowpack layers, Ann. Glaciol., 32, 59, 10.3189/172756401781819472 Landry, 2004, Variations in snow strength and stability on uniform slopes, Cold Reg. Sci. Technol., 39, 205, 10.1016/j.coldregions.2003.12.003 Lehning, 2002, A physical SNOWPACK model for the Swiss avalanche warning service. Part III: meteorological forcing, thin layer formation and evaluation, Cold Reg. Sci. Technol., 35, 169, 10.1016/S0165-232X(02)00072-1 Lehning, 2002, A physical SNOWPACK model for the Swiss avalanche warning. Part II: snow microstructure, Cold Reg. Sci. Technol., 35, 147, 10.1016/S0165-232X(02)00073-3 Lehning, 2004, Modelling instability in the Swiss snow cover model SNOWPACK, Ann. Glaciol., 38, 331, 10.3189/172756404781815220 Logan, 2007, Temporal changes in the slope-scale spatial variability of the shear strength of buried surface hoar layers, Cold Reg. Sci. Technol., 47, 148, 10.1016/j.coldregions.2006.08.002 Martinelli, 1971, Physical properties of alpine snow as related to weather and avalanche conditions McClung, 1981, Fracture mechanical models of dry slab avalanche release, J. Geophys. Res., 86, 10783, 10.1029/JB086iB11p10783 McClung, 2005, Dry slab avalanche shear fracture properties from field measurements, J. Geophys. Res., 110, F04005, 10.1029/2005JF000291 McClung, 2006, Fracture toughness of dry snow slab avalanches from field measurements, J. Geophys. Res., III, F04008, 10.1029/2005JF000403 Mellor, 1975, A review of basic snow mechanics, 251 Perla, 1982, The shear strength index of alpine snow, Cold Reg. Sci. Technol., 6, 11, 10.1016/0165-232X(82)90040-4 Roch, 1966, Les variations de la résistance de la neige, vol. 69, 86 Salway, A.A., 1976. Statistical estimation and prediction of avalanche activity from meteorological data for the Rogers Pass Area of British Columbia. Ph.D. Thesis, University of British Columbia, Canada. Schleiss, 1970, Avalanche hazard evaluation and forecast, Rogers Pass, Glacier National Park, vol. 98, 115 Schweizer, 1996, Avalanche forecasting — an expert system approach, J. Glaciol., 42, 318, 10.1017/S0022143000004172 Schweizer, 2003, Snow avalanche formation, Rev. Geophys., 41, 1016, 10.1029/2002RG000123 Schweizer, J., Kronholm, K., Jamieson, B., Birkeland, K.W., in press. Review of spatial variability of snowpack properties and its importance for avalanche formation. Cold Reg. Sci. Technol. Schweizer, 2004, On the fracture toughness of snow, Ann. Glaciol., 38, 1, 10.3189/172756404781814906 Schweizer, 2006, Evaluating and improving the stability predictions of the snow cover model SNOWPACK, Cold Reg. Sci. Technol., 46, 52, 10.1016/j.coldregions.2006.05.007 Seligman, 1936 Sigrist, C., 2006. Measurement of fracture mechanical properties of snow and application to dry snow slab avalanche release. D.Sc. Dissertation, Swiss Federal Institute of Technology, Zurich, Switzerland. Sommerfeld, 1980, Statistical models of snow strength, J. Glaciol., 26, 217, 10.1017/S0022143000010753 Sommerfeld, 1979, A recommendation for the application of the Roch index for slab avalanche release, J. Glaciol., 22, 402, 10.1017/S0022143000014398 Szabo, 2006, Sub-second sintering of ice, Geophys. Res. Abstr., 8, 06327 Vick, 2002 Zeidler, A., 2004. Forecasting skier-triggered avalanches in the Columbia Mountains of Canada. Ph.D. Thesis, Dept. of Civil Engineering, University of Calgary, Calgary, Alberta, Canada. Zeidler, 2004, A nearest-neighbour model for forecasting skier-triggered dry-slab avalanches on persistent weak layers in the Columbia Mountains, Canada, Ann. Glaciol., 38, 166, 10.3189/172756404781815194 Zeidler, 2006, Refinements of empirical models to forecast the shear strength of persistent weak layers. Part A: layers of faceted crystals, Cold Reg. Sci. Technol., 44, 194, 10.1016/j.coldregions.2005.11.005 Zeidler, 2006, Refinements of empirical models to forecast the shear strength of persistent weak layers. Part B: layers of surface hoar crystals, Cold Reg. Sci. Technol., 44, 184, 10.1016/j.coldregions.2005.11.004