Sounding-derived parameters associated with large hail and tornadoes in the Netherlands

Groenemeijer, Pieter; Delden, A.J. van

doi:10.1016/j.atmosres.2005.08.006

Cited by 126 publications

(92 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Thermodynamic instability represented by CAPE index (2880 J kg -1 ) and Lifted Index (-8,34°C) posed a high risk of severe thunderstorms with favorable conditions for the large hail. Measured deep layer wind shear (wind speed difference between surface and 6 km above the ground level, see Groenemeijer and van Delden 2007) was not significant (15 m s -1 ), but together with increased 0-3 km storm relative helicity (128 m 2 s…”

Section: Synoptic Conditionsmentioning

confidence: 99%

“…2009). The climatological approach to the subject of hail forecasting becomes less useful as the analyses of convective parameters and atmospheric soundings gained more popularity and became more effective in forecasting severe weather phenomena (Craven andBrooks 2004, Groenemeijer andvan Delden 2007). Although this study is limited only to one year, it is worth mentioning that not many studies in Poland have been devoted to analyze in particular large hail phenomena and case study of the most severe events.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Large Hail in Poland in 2012

Taszarek

Suwała

2015

Quaestiones Geographicae

View full text Add to dashboard Cite

This report analyses significant hailstorms that occurred in Poland during 2012. The number of reports, derived from the European Severe Weather Database with the hail diameter over or equal 2 cm, were analyzed with respect to their frequency in individual months, time of the day, intensity and spatial distribution. Analyzed cases were divided for hail with diameter less than 4 cm and greater or equal 4 cm. Accompanying conditions were examined by synoptic analysis charts derived from Deutscher Wetterdienst. The total number of 121 large hail cases gave 26 days with this phenomenon. The period of their occurrence extended from April to August reaching peak in July. Above 60% of all events were reported between 1500 and 1800 UTC. Most of them were associated with cold front and squall line features, usually with the south-western warm and moist air mass influx.

show abstract

Section: Synoptic Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Large Hail in Poland in 2012

Taszarek

Suwała

2015

Quaestiones Geographicae

View full text Add to dashboard Cite

show abstract

“…Miglietta and Regano (2008) confirm the importance of even a relatively shallow orography for the development of convective cells, using weather research and forecasting model (WRF) sensitivity experiments over a small area in Apulia (in southern Italy). Regarding CAPE, several researchers have noted that large values of CAPE are not mandatory for tornado development (Monteverdi et al, 2003;Hannesen et al, 1998;Groenemeijer and Van Delden, 2007). Besides CAPE, Rasmussen (2003) has shown that the storm relative helicity (SRH) in the lower atmosphere (Table 1) can be used to distinguish non-tornadic from weakly and significantly tornadic storms.…”

Section: T Matsangouras Et Al: Effect Of Topography On Tornadogementioning

confidence: 99%

Numerical modeling and analysis of the effect of complex Greek topography on tornadogenesis

Matsangouras

Pytharoulis

2014

Nat. Hazards Earth Syst. Sci.

View full text Add to dashboard Cite

Abstract. Tornadoes have been reported in Greece over recent decades in specific sub-geographical areas and have been associated with strong synoptic forcing. While it has been established that meteorological conditions over Greece are affected at various scales by the significant variability of topography, the Ionian Sea to the west and the Aegean Sea to the east, there is still uncertainty regarding topography's importance on tornadic generation and development.The aim of this study is to investigate the role of topography in significant tornadogenesis events that were triggered under strong synoptic scale forcing over Greece. Three tornado events that occurred over the last years in Thebes (Boeotia, 17 November 2007), Vrastema (Chalkidiki, 12 February 2010) and Vlychos (Lefkada, 20 September 2011) were selected for numerical experiments. These events were associated with synoptic scale forcing, while their intensities were T4-T5 (on the TORRO scale), causing significant damage. The simulations were performed using the non-hydrostatic weather research and forecasting model (WRF), initialized by European Centre for Medium-Range Weather Forecasts (ECMWF) gridded analyses, with telescoping nested grids that allow for the representation of atmospheric circulations ranging from the synoptic scale down to the mesoscale. In the experiments, the topography of the inner grid was modified by: (a) 0 % (actual topography) and (b) −100 % (without topography), making an effort to determine whether the occurrence of tornadoes -mainly identified by various severe weather instability indices -could be indicated by modifying topography. The principal instability variables employed consisted of the bulk Richardson number (BRN) shear, the energy helicity index (EHI), the storm-relative environmental helicity (SRH), and the maximum convective available potential energy (MCAPE, for parcels with maximum θ e ). Additionally, a model verification was conducted for every sensitivity experiment accompanied by analysis of the absolute vorticity budget.Numerical simulations revealed that the complex topography constituted an important factor during the

show abstract

“…Additionally, there were some erroneous measurements near the ground. Nevertheless, one can see the over-adiabatic ground layer with easterly winds and the southerly flow in higher levels and the latent instability (Galway 1956;Groenemeijer 2005). CAPE, calculated from a parcel from the lowest 500 m of the atmosphere, raised dry adiabatically to the LCL and moist adiabatically thereafter, is about 1,200 J kg -1 compared to a CAPE of approximately 1,500 J kg -1 calculated from the model data.…”

Section: Pre-storm Conditionsmentioning

confidence: 99%

Nowcasting of a supercell storm with VERA

Schneider

Chimani

Kaufmann

et al. 2008

Meteorol Atmos Phys

View full text Add to dashboard Cite

On 13th May 2003, a severe weather event took place in Vienna, located in the eastern part of Austria at the foothills of the Alps. A supercell storm was reported by storm chasers, including a tornado, large hail and flash floods due to heavy precipitation, causing damage to both people and to goods in parts of Vienna downtown, which is a rather rare event in this region. For this reason, the development of the thunderstorm has been analysed from the synoptic scale down to the storm scale using different data sources, including, e.g. ground measurements, radio soundings and remote sensing data, for a better understanding of the onset and evolution of such a severe weather event. Furthermore, VERA (Vienna Enhanced Resolution Analysis), a real-time analysis system for surface data, was tested on this case study. Measurements which were available during the event have been used to reanalyse the pre-storm situation, testing the possibility of nowcasting such a storm.

show abstract

Sounding-derived parameters associated with large hail and tornadoes in the Netherlands

Cited by 126 publications

References 22 publications

Large Hail in Poland in 2012

Large Hail in Poland in 2012

Numerical modeling and analysis of the effect of complex Greek topography on tornadogenesis

Nowcasting of a supercell storm with VERA

Contact Info

Product

Resources

About