FOEHN WINDS

Fire danger anomalies associated with foehn-like winds in southeastern Australia

In southeastern Australia the synoptic archetypical severe fire weather day is that of the dry “cool change”, or coastally modified cold front. Less well known, however, are synoptic cases that occur in connection with the topography of the eastern Australian mainland and Tasmania, which can also lead to abrupt spatiotemporal changes in fire weather variables that ultimately result in locally e...

The Heat Source of the Foehn

Twelve years of upper air data and surface observations across Iceland are used to investigate the connection between the difference of surface air temperature upstream and downstream of the Icelandic highlands and several parameters of the airflow, such as precipitation, static stability and wind speed. The data does not support the well-known concept of the heat of the foehn being a result of...

Swiss and Austrian Foehn revisited: A Lagrangian-based analysis

Two different South Foehn types have been described in the literature: the Swiss Foehn is characterized by significant ascent on the southern side of the Alps, hence fulfilling a requirement of the thermodynamic Foehn theory associated with latent heating. On contrast, the Austrian Foehn is characterized by near-horizontal flow to the south of the Alps, followed by dry-adiabatic descent into th...

Parker Winds Revisited: An Extension to Disk Winds

Parker Winds Revisited: An Extension to Disk Winds by Timothy R. Waters Dr. Daniel Proga, Examination Committe Chair Associate Professor of Physics & Astronomy University of Nevada, Las Vegas A simple 1D dynamical model of thermally driven disk winds is proposed, based on the results of recent, 2.5D axi-symmetric simulations. Our formulation of the disk wind problem is in the spirit of the orig...

Improvement of vertical winds