Numerical Study of an Intense Episode of Vardaris Wind
This paper presents a case study of an episode of Vardaris that occurred on 10 November 2007 and caused widespread problems in Central Macedonia. It uses surface data including four stations along Axios valley (Evzonoi, Aksioupoli, Akropotamos, and Kymina), analyses and the nonhydrostatic Weather Research and Forecasting model. The episode was associated with the combination of a transient depression over Greece and an anticyclone in Western Europe. Maximum sustained wind speeds of 20.5 m/s with gusts up to 28.2 m/s appeared along Axios and at Thessaloniki airport (24 m/s with gusts up to 31.9 m/s). The model simulations with a horizontal resolution of 1 km were in good agreement with observations. The strongest winds, in excess of 30–35 m/s, were simulated between 750 and 900 hPa in the form of a jet streak. A numerical experiment showed that the occurrence of the episode was determined by the synoptic scale flow, but its maximum intensity was specified by the local conditions due to channeling.
KeywordsWind Speed Maximum Wind Speed Sustained Wind Speed Maximum Sustain Wind Speed Transient Depression
The authors would like to thank NOA (and especially Dr. Lagouvardos and Dr. Koletsis), HNMS, the School of Agriculture of AUTH, ELGA, the Region of Central Macedonia, ECMWF, UKMO and NCEP for the availability of the necessary data as well as NCAR for providing the WRF-ARW model.
- Angouridakis V, Balafoutis Ch, Maheras P (1981) Les Vents de NW, et “Vardaris” a Thessalonique. Essai statistique. Eaux et Climats. Melanges offerts en homage a ChPEGUE. GrenobleGoogle Scholar
- Maheras P, Flocas A, Karacostas Th (1984) La structure de la basse troposphere pendant le vent Vardaris a Thessalonique. Zbornik 10:241–243Google Scholar
- Psarri L (2005) The local wind of Thesaloniki, Vardaris – an approach to the problem with classical methods and the use of artificial neural networks. MSc thesis, AUTHGoogle Scholar
- Wang W, Bruyère C, Duda M, Dudhia J, Gill D, Lin H-C, Michalakes J, Rizvi S, Zhang X (2010) ARW Version 3 modeling system user’s guide. NCAR-MMM, p 312Google Scholar