The New Zealand Southerly Change Experiment

Steiner, Julia; Revell, Clifford G.; Ridley, R. N.; Smith, Roger K.; Page, Michael A.; McInnes, Kathleen L.; Sturman, Andrew

doi:10.1175/1520-0477(1987)068<1226:tnzsce>2.0.co;2

Cited by 7 publications

References 4 publications

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The Papal Front of 3 May 1987: A remarkable example of frontogenesis near the Alps

Volkert¹,

Weickmann²,

Tafferner³

1991

Quart J Royal Meteoro Soc

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All available, routinely collected surface data are used to document the development of the 'Papal Front', which crossed southern Germany on 3 May 1987 causing casualities and damage. Objective analyses on isentropic surfaces, initialized with the European aerological data, indicate that the development of the violent mesoscale front, which exhibited squall-line characteristics, began when a distinct mid-troposopheric anomaly of potential vorticity reached the north-western rim of the Alpine arc. The forced uplift ahead of the associated shortwave trough combined with ageostrophic motions due to a jet streak at higher levels apparently provided a trigger for deep convection as was observed over the Alpine foreland. Numerical simulations with a dry hydrostatic model indicate the relative importance of the synoptic-scale forcing and the Alpine orography for the generation of the 'Papal Front'. A westerly 'orographic jet' over the foreland below crest height only develops in the simulation with full Alps and is corroborated by the few mountain wind observations that are available.A comparison with studies of frontal propagation along other mountain ranges reveals that the routine network in the Alpine region and its surroundings is at least of similar density, but so far hardly used for frontal case-studies. It is concluded that a series of 'routine-data case-studies' could help to determine the variability of frontal progression along the Alps and, thus, provide guidance when assessing the significance of single events, particularly those sampled during special observation programmes. * Retired, formerly with Deutscher Wetterdienst, Offenbach, F.R.G. t This term is used with the meaning of 'land in front' as in the German word Vorland 125 * The semantic problem arising from geographic names with English and German versions is dealt with in the following way. In the text the English version is used (e.g. Munich, Constance), whereas the German form of the names appear in the tables and figure captions (e.g. Munchen, Konstanz).

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