Downslope Windstorms - RAL - UCAR

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25 October 1997 Blowdown Event 25 October 1997 Blowdown Event West of the Park Range 13,000 acres of old growth trees blown down in Mount Zirkel Wilderness Area/Routt National Forest, trees stacked 30 feet high, hunters trapped for 2 days; strongest winds lasted ~30 min Wind gusts exceeded 100 mph for 7 hrs at Arapahoe Basin Ski Area (el. 12,500 ft; peak gust 114 mph out of the east, windchill to -60°F) Factors: strong synoptically-driven flow from east to west (blizzard of ’97), an unusually cold and stable layer on the windward side of the mountains Picture courtesy U.S. Forest Service For more, see Meyers et al (2003)
RAMS Model Simulation Figures from FSL Forum, Feb. 1999 (Wind speed in knots, height in meters)
Page 1 and 2: Downslope Windstorms Downslope Wind
Page 3 and 4: Naming conventions and Naming conve
Page 5 and 6: A few notes on the Chinook A few no
Page 7 and 8: Windstorm Damage Windstorm Damage
Page 9 and 10: Figure from Kuettner and Lilly (196
Page 11 and 12: Composite soundings at onset of Com
Page 13 and 14: Observations from the 11 January Ob
Page 15 and 16: Figures from Lilly (1978)
Page 17 and 18: Downslope Windstorm Downslope Winds
Page 19 and 20: Supercritical case Supercritical ca
Page 21 and 22: Hydraulic jump case Hydraulic jump
Page 23 and 24: General development General develop
Page 25: Other forecast factors Other foreca
Page 29 and 30: Fort Collins Windstorm Climatology
Page 31 and 32: FC Windstorm Climatology, cont’d
Page 33 and 34: Wind trace of windstorm at Fort Col
Page 35 and 36: Rotors Rotor: a region of reversed
Page 37 and 38: Rotor observations from Sierra Roto
Page 39 and 40: Figure from Grubiši and Lewis (200
Page 41 and 42: Rotor formation, cont’d Rotor for
Page 43 and 44: Figure from Doyle and Durran (2004)
Page 45 and 46: References, Cont’d Hamann, R. R.,
Page 47: References, Cont’d Raphael, M. N.

Downslope Windstorms - RAL - UCAR

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