Downslope Windstorms - RAL - UCAR

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Max gusts in kt (y-axis) versus time of day occurs (x) 85 80 75 70 65 60 55 50 0 6 12 18 24 Note that there is no preferential time of year for maximum gusts Max gusts occur during all parts of the day, with a weak peak around midday 85 Max gust in kts versus Month of year 80 75 Average windstorm duration is 8 hrs (min of 1.25 h, max of 20 h) 70 65 60 Data courtesy of John Weaver (see Lee et al 1989; Weaver and Phillips 1990) 55 50 0 1 2 3 4 5 6 7 8 9 10 11 12
Wind trace of windstorm at Fort Collins Note that winds are much steadier than Boulder storms Trace courtesy of Richard Johnson
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 and 26: Other forecast factors Other foreca
Page 27 and 28: RAMS Model Simulation Figures from
Page 29 and 30: Fort Collins Windstorm Climatology
Page 31: FC Windstorm Climatology, cont’d
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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