Mid-Mountain (a.k.a Harvey’s) Clouds at Whistler, BC, Canada Ruping Mo Environment Canada.

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Presentation transcript:

Mid-Mountain (a.k.a Harvey’s) Clouds at Whistler, BC, Canada Ruping Mo Environment Canada

Whistler Mountain

Mid-Mountain (Harvey’s) Clouds Harvey Fellowes 1040 PST

Mid-Mt. Clouds (Mosaic)

Impact of Alpine clouds 11 February 2010, Whistler

Diurnal visibility Occurrence frequency 5 Feb – 21 Mar 2010

Mid-mountain cloud – 1340 PST

Mid-mountain cloud Thermal impact: Thermally forcing up-slope flow interacting with inversion in the morning (Mo et al. 2012) Late-morning tendency

Mid-mountain cloud – 1340 PST A Case Study

Mid-mountain cloud A Case Study: Morning (1000 PST, 16 Feb 2010 )

Mid-mountain cloud A Case Study: Afternoon (1600 PST, 16 Feb 2010)

Mid-mountain cloud Whistler (WAE) Sounding

Mid-mountain cloud

Dry layer (cloud top)

Model Prediction (1 km resolution) Meteograms at mid-mountain (VOL, ) Low visibility Cloudy No high cloud

Model Prediction (1 km resolution) Meteograms at mid-mountain (VOL, ) Cloudy No high cloud Gusty SW winds

Observation vs Prediction

Page 18 – March 4, 2016 Observed Predicted

Model Prediction 1 km resolution model Visibility forecast

Model Prediction 1 km resolution model Valid at PST (1900 UTC)

1 km resolution model Valid at PST (1900 UTC) (Vertical velocity) Model Prediction

Conceptual Model Valley inflow drives up-slope flow and gives rise to clouds Leeward subsidence of elevated flow traps the clouds Late-morning tendency is thermally driven

Page 23 – March 4, 2016 Another Case

Oscillation on mountain slope , 1100 – 1500 PST

Oscillation on mountain slope , 1100 – 1500 PST Possible mechanisms: Cloud-top evaporative instability

Oscillation on mountain slope , 1100 – 1500 PST Possible mechanisms: Cloud-top evaporative instability Slope-flow induced gravity waves

Page 27 – March 4, 2016

Page 28 – March 4, 2016

Summary Mid-mountain clouds at Whistler are common in Winter Mid-Mt clouds form most frequently late in the morning Mid-Mt clouds form under stably stratification, usually post-frontal, when moderate valley inflow prevails Mid-Mt clouds form on the leeward slope, when weak to moderate leeward subsidence is expected Mid-Mt clouds could experience oscillations with 1-3 hr periods Mid-Mt clouds have significant impact on downhill skiing competitions Demonstrate value of web cams, 1 km model

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