Downslope windstorm in High Tatras, 19 November 2004

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Mesoscale diagnostics• Increase of stability on the lee side – indicatesa strong downslope windApproximate Froud numberMean Brunt Vaisala frequency
Conclusions: points of view• NWP Operation: High resolution models, evenhydrostatic, enable to forecast such unusual severeevent, dynamic adaptation seems to be sufficient• Forecasting: All HR runs forecast the maincharacteristics of downslope windstorms (e.g. hydraulicjump)• NWP Development: A case study necessary to test innew cycles, probably high dependence on physicalparameterisation (turbulence scheme ?)• Science: needs for better analytical model + higherresolution model to simulate microscale effects
Page 1 and 2: Downslope windstorm in High Tatras1
Page 3 and 4: Impact of the 19 November windstorm
Page 5 and 6: Local observations• Gusty charact
Page 7 and 8: Success of the operational forecast
Page 9 and 10: 2.5 km hydrostatic run with physics
Page 11 and 12: 2,5 km non- hydrostatic run• Time
Page 13 and 14: Sensitivity testsMax. gust 40 m/s33
Page 15: Mesoscale diagnostics• Increase o

Downslope windstorm in High Tatras, 19 November 2004

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