Participants in ESTOFEX are listed below. The organizations with which the members are associated do not necessarily have a relation with ESTOFEX.

To contact Estofex you can send an e-mail to .

Estofex forecasters
Oscar van der Velde

(Netherlands, 1977; currently in Spain)

Oscar van der Velde is researcher of lightning and high-altitude electrical discharges (sprites, jets) produced by thunderstorm systems, at the Technical University of Catalonia. He obtained his PhD degree in the same field in Toulouse (2008), and his MSc degree in Meteorology from Wageningen University (2002). During and after his studies, he worked at the national meteorological institute in The Netherlands (KNMI) on topics as total lightning activity of thunderstorms compared to radar and other parameters, model initialization, and vertical profiles derived from aircraft observations. In 2001 Oscar visited the University of Oklahoma in Norman (USA) for six months to collaborate with Dr. MacGorman on relations between 3D lightning activity and precipitation types derived from polarimetric radar. He returned in 2003 and followed two advanced meteorology courses. Oscar runs a website showing his other main hobby: photography of weather phenomena and landscapes.

Helge Tuschy

(Germany, 1983)

Helge Tuschy (1983) has studied Meteorology / Geophysics at the Leopold-Franzens University of Innsbruck, Austria. In 2002, he worked in the National Weather Service Amarillo, Texas for 3 weeks on the day-and night shifts including occasional chasings. In the spring of 2004, he visited the Storm Prediction Center ( SPC ) where he got the chance to work with a meteorologist on a tornado climatology project. 3 years later, in 2007, he visited the National Weather Service (NWS) of Amarillo, TX again where he worked for 3 weeks with a supervisor and he was also able to spend a day in the SPC where he was taught how to create an outlook. In 2011, he was in SPC operations each day (Aug 8-19), where he got a deep insight in convective forecasting. Similar activities were carried out in the NWS (Norman, Oklahoma) with the focus on the handling of forecasting tools in the nowcast. In 2012, he joined the Hazardous Weather Testbed in Norman, Oklahoma for 2 weeks, where he was trained by forecasters of the SPC and by scientists of the NSSL/CIMMS how to use the most recent model data and remote-sensing/ensemble products for organized thunderstorm forecasting (EWP) and how to prepare SWODYs with aforementioned data (EFP). Helge participated in the ECSS 2007/09/11 in Trieste/Landshut/Palma de Mallorca and he prepared numerous talks/presentations (e.g. for diverse national weather services, international insurance companies and media institutions). Since 2010 he works as a weather forecaster for the Deutsche Wetterdienst (DWD) in Leipzig Saxony.

Johannes Dahl

(Germany, 1980; currently in the USA)

Johannes Dahl is working as post-doc in the Convective Storms Group at the North Carolina State University. His current research is focusing on the source of near-surface rotation in tornadic thunderstorms. He obtained his M.Sc. degree at the Free University of Berlin and his Ph.D. at DLR/LMU in Munich, where he investigated what determines the lightning flash rate in thunderstorms. In the spring of 2010 he participated in the VORTEX2 field campaign where he launched radiosondes near tornadic and nontornadic supercell thunderstorms.

Christoph Gatzen

(Germany, 1975)

Christoph Gatzen has studied Meteorology in Cologne and at the Free University of Berlin, where he founded the "Berlin Weather Forecast Challenge" together with J. Hoffmann. He has been a lecturer for the weather discussion, and organized a successful initiative to continue weather observations at the WMO station 10381 Berlin-Dahlem. He has written his M.Sc. thesis at the German Weather Service (DWD) on "The impact of incremental digital filter initialisation on analysis fields of the GME". He has published the first case study about a derecho that occurred outside of the United States, while working at the German Aerospace Center. Currently, he is operational forecaster at MC-Wetter in Berlin.

Oliver Schlenczek

(Germany, 1985)

Oliver Schlenczek studies meteorology at the Johannes Gutenberg University of Mainz. He has participated in COPS (convective and orographically-induced precipitation study) in a mobile team for surface measurements and soundings. In 2007, Oliver prepared some presentations about severe weather in Germany and thunderstorm forecast. He is going to present a case study about the severe weather outbreak on July 29, 2005 at the Extreme Weather Congress in Hamburg on March 27, 2008.

Tomas Pucik

(Slovakia, 1987; currently in Czech Republic)

Tomas is a student of Physical Geography at Masaryk University in Brno, Czech republic. He is employed part-time at the Regional Forecast Office of Czech HydroMeteorological Institute (CHMI). Tomas has a life-long interest in thunderstorms and the severe weather that accompany them, which is also the theme of his BSc thesis. Besides thunderstorms, he is also interested in winter storms and local mountainous climate conditions and anomalies.

Pieter Groenemeijer

(The Netherlands, 1979; currently in Germany)

Pieter Groenemeijer is working at the Ludwig-Maximilians Univeristät in München. His current job concerns the development of an ensemble forecasting system that does not only take the uncertainties of the large-scale flow into account, but also those that develop on the scale of convective storms and smaller. Before, he has successfully defended his Ph.D. thesis at the University of Karlsruhe, which focused on the differences of convective storm development in weak and in strong vertical wind shear. In the past, he has worked at the Finnish Meteorological Institute (FMI), which resulted in a guide on forecasting severe convective storms. He has studied meteorology at Utrecht University (Netherlands) which included a half year's stay at the University of Oklahoma, USA. He has studied the application of Doppler radar in severe convective weather at the Netherlands Meteorological Institute (KNMI), resulting in this report. Pieter is involved with the European Severe Weather Database (ESWD), a project of the European Severe Storms Laboratory.

Others members of ESTOFEX
Charles (Chuck) Doswell III

Senior Research Scientist
CIMMS, University of Oklahoma
Norman, Oklahoma
United States of America

Nick Verge

United Kingdom

Angel Dimitrov


Ben Lankamp

The Netherlands

David Rýva

Skywarn CzechoSlovakia
Czech Republic

Ernani Nascimento

Professor of Meteorology
Universidade Federal de Santa Maria

Sébastien Poitevin


Harold Brooks

National Severe Storms Laboratory
Norman, Oklahoma
United States of America

Greg Stumpf

National Severe Storms Laboratory
Norman, Oklahoma
United States of America

Lionel Peyraud

National Weather Service MeteoSwiss

Jim LaDue

United States of America

Ari-Juhani Punkka

Meteorologist / researcher
Finnish Meteorological Institute

Jenni Teittinen

Meteorologist / researcher
Finnish Meteorological Institute

Lars Lowinski


Bogdan Antonescu


Aurora Stan-Sion


Stuart Robinson

UK Tornado forecasting and site investigations
United Kingdom

Jan Hoffmann

Radar meteorologist
Meteo Service weather research GmbH

Please note that ESTOFEX assumes no responsibility for the contents of the listed personal websites.

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