Theoretical and Applied Climatology

, Volume 50, Issue 3–4, pp 185–203

A climatological study of thunderstorm activity in the Po Valley

  • C. Cacciamani
  • F. Battaglia
  • P. Patruno
  • L. Pomi
  • A. Selvini
  • St. Tibaldi


After a description of the monthly distribution of thunderstorm occurrence in the Po Valley and in the Northern Adriatic region and an identification of the homogeneous areas in terms of the contemporary occurrence of the phenomenon, this study examines the dynamic and thermodynamic characteristics of the atmosphere that are conducive to the development of thunderstorms. The study was carried out using ground-level and radiosonde observed data, as well as objective analyses of mean sea level pressure, geopotential height and vertical velocity at different upper-air levels. The period considered, not always homogeneous for the different types of data, refers to the years 1985–1988.

The main result that emerges from this study is that thunderstorms are, in the majority of cases, associated with synoptic-scale dynamical forcing, as for example the passage of fronts (generally cold) in the Po Valley, which are also almost invariably connected with depressions affecting the entire Northern Italy. Only a small number of thunderstorms can be attributed to pure local thermodynamic causes, such as for example moist-static instability due intense heating. An analysis of the thermodynamic indices indicates that a suitable vertical distribution of humidity, temperature and static stability can certainly favour thunderstorm activity, but only when the larger scale dynamical forcing is favourable (from the subsynoptic scale to the mesoscale) will the organized convection develop in a sustained manner.


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  1. Alberoni, P. P., Buzzi, A., Cacciamani, C., 1993: The episode of thunderstorm outbreak of 10 June 1990 over Northern Italy,Il Nuovo Cimento 16C/4, 375–391.Google Scholar
  2. Anderberg, M. R., 1973:Cluster Analysis for Applications. New York: Academic Press.Google Scholar
  3. Bossolasco, M., 1949: La distribuzione dei temporali in Italia. Energia.Elettro. XXVI(11–12, 3–15.Google Scholar
  4. Buzzi, A., Tibaldi, S., 1978: Cyclogenesis in the lee off the Alps: a case study.Quart. J. Roy. Meteor. Soc. 104, 271–287.Google Scholar
  5. Buzzi, A., 1984: Alpine cyclogenesis events during ALPEX.Rivista di Meteorologia Aeronautica XLIV, 61–67.Google Scholar
  6. Buzzi, A., Alberoni, P.P., 1992: Analysis and numerical modelling of a frontal passage associated with thunderstorm development over the Po Valley and the Adriatic Sea.Meteorol. Atmos. Phys. 48, 205–224.Google Scholar
  7. Cacciamani, C., Nanni, S. C., Paccagnella, T., Tampieri, F., Trombetti, F., 1984: Mesoscale interaction of stratified flow and topography in the Po Valley: a diagnostic study.Beitr. Phys. Atoms. 57/3, 431–439.Google Scholar
  8. Cacciamani, C., Simonini, G., 1988: The monitoring of thunderstorm activity in the Italian Region Emilia Romagna: climatological aspects and operative forcasting system. IV International Conference on weather and road safety. Firenze, 8–10 novembre 1998.Google Scholar
  9. Cacciamani, C., Tibaldi, S., Nanni, S., 1994: Mesoclimatology of winter temperature and precipitation in the Po Valley of Northern Italy.Int. J. Clim. 14, 777–814.Google Scholar
  10. Cantù, V., 1977: The climate of Italy. In: Wallen, C. C. (ed.)World Survey of Climatology. Climates of Central and Southern Europe. WMO, Geneva.Google Scholar
  11. Charba, J. P., 1979: Two to six hour severe local storm probabilities: An operational forcasting system.Mon. Wea. Rev. 107, 268–282.Google Scholar
  12. George, J. J., 1960:Weather Forecasting for Aeronautics. New York: Academic Press, 673 pp.Google Scholar
  13. Gill, A. E., 1982:Atmosphere-Ocean Dynamics. New York: Academic Press, 662 pp.Google Scholar
  14. Giuliacci, M., 1988:Climatologia Fisica e Dinamica della Valpadana. Bologna: ERSA/SMR.Google Scholar
  15. Holton, J. R., 1992:An Introduction to Dynamic Meteorology 3rd edn. San Diego: Academic Press.Google Scholar
  16. Ludlam, F. H., 1980:Clouds and Storms. Univ. Par., London: Pennsylvania State University Press.Google Scholar
  17. Miller, R. C., 1972: Notes on analysis and severe-storm forecasting procedures of the Air Force Global Weather Central. Air Weather Service Tech. Rep. 200 (Rev.). U.S. Air Force, 102 pp. [NTIS AD 744042].Google Scholar
  18. Modd, M. A., Graybill, F., Boes, D., 1988:Introduzione alla statistica Milsus: McGraw-Hill. Libi ItalieGoogle Scholar
  19. Morgan, G. M., 1973: A general discription of the hail problem in the Po Valley of northern Italy.J. Appl. Meteor. 12, 338–353.Google Scholar
  20. Orlanski, I., 1975: A rational subdivision of scales for atmospheric processes.Bull. Amer. Meteor. Soc. 56, 527–530.Google Scholar
  21. Paccagnella, T., Tibaldi, S., Buizza, R., Scoccianti, S., 1992: High-resolution numerical modelling of convective precipitation over Northern Italy.Meteorol. Atmos. Phys. 50, 143–163.Google Scholar
  22. Perona, G. E., Canavero, F., Ghigo, O., Ordano, L., 1980: Characterization of thunderstorm clouds from digital radar data recorded in the north-west of Italy in the 1979 summer. VIII Conference Internationale sur la Physique des nuages, Clermont-Ferrand, Juillet 1980.Google Scholar
  23. Prodi, F., 1974a: Combined photo and radar observations of storms in the Po Valley.Riv. It. di Geofisica XXIII(1/2, 82–88.Google Scholar
  24. Prodi, F., 1974b: Climatologia della grandine nella Valle Padana (1968–1972).Riv. It. di Geofisica XXIII(5/6, 283–290.Google Scholar
  25. Prodi, F., Wirth, E., 1973: Mesoscale and microphysical investigation of an isolated hailstorm.Riv. It. di Geofisica XXII(3/4, 165–185.Google Scholar
  26. Ray, P., 1986: Mesoscale Meteorology and Forecasting. Baston.Amer. Meteor. Soc., 793 pp.Google Scholar
  27. Showalter, A. K., 1953: A stability index for thunderstorm forcecasting.Bull. Amer. Meteor. Soc. 34, 250–252.Google Scholar
  28. Stone, H. M., 1985: A comparison among various thermodynamic parameters for the prediction of convective activity: Part II. NOAA Tech. Memo. NWS ER-69. National Oceanic and Atmospheric Administration, U.S. Department of Commerce, 14 pp.Google Scholar
  29. Tampieri, F., Trombetti, F., Scarani, C., 1981: Summer daily circulation in the Po Valley, Italy.Geoph. Astroph. Fluid Dynamics 17, 97–112.Google Scholar
  30. Tampieri, F., Nanni, S. C., Paccagnella, T. Trombetti, F., Cacciamani, C., 1984: A preliminary analysis of mesoscale flow in the Po Valley during ALPEX.Rivista di meteorologia aeronautica XLIV, 103–112.Google Scholar
  31. Tibaldi, S., Buzzi, A., Speranza, A., 1990: Orographic cyclogenesis. In: Newton, C., Holopainen, E. O. (eds.)Extratropical Cyclones. Boston:Amer. Meteor. Soc. Google Scholar
  32. WMO, 1974: Manual on codes, vol. 1–2. Secretariat of the World Met. Organiz., Geneve, Switzerland, WMO n.306.Google Scholar

Copyright information

© Springer-Verlag 1995

Authors and Affiliations

  • C. Cacciamani
    • 1
  • F. Battaglia
    • 1
  • P. Patruno
    • 1
  • L. Pomi
    • 1
  • A. Selvini
    • 1
  • St. Tibaldi
    • 2
  1. 1.Regional Meteorological Service of Emilia RomagnaBolognaItaly
  2. 2.Dipartimento di Fisica, Gruppo Dinamica AtmosfericaUniversità degli Studi di BolognaBolognaItaly

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