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Lars Wiegand, Arwen Twitchett, Cornelia Schwierz, and Peter Knippertz

stress or friction velocity by its first-order control low-level wind speed U , we can define the PDU in the following way: where U t denotes the constant threshold velocity that is typically on the order of 8 m s −1 at 10 m above the ground ( Chomette et al. 1999 ). As 10-m winds are not a prognostic variable in TIGGE models, it has to be computed through extrapolation from the lowest model level using parameters from the boundary layer scheme. The details of this procedure can lead to dramatic

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