thunderstorms and thunder observations sven-erik enno estonia 10.08.2005

Thunderstorms and thunder observations

Sven-Erik EnnoEstonia

10.08.2005

Different types of thunderwinds

• Straight line winds• Gustfronts• Microbursts• Tornadoes• Mesocyclones

Structure of a thundercloud

Structure of a thundercloud

Structure of a thundercloud

Damaging winds occurr if...

• Air temperature and relative humidity values are high

• There are multicell / supercell thunderstorms

• Vertical windshear is strong enough• Storng convectiv airflows occur• Sharp temperature and air pressure

contrasts under and around thunderclouds

Vertical airflows inside thundercloud

Microbursts / downbursts

Air temperature and pressure contrasts

Windsystem of a thundercloud

Straight line winds formation

Straight line winds between two thunderclouds

Damaging straight line winds in Estonia 16.07.2001

Air pressure

Air temperature

Windspeed m/s

Wind direction

16-th July 2001

16-th July 2001

Storm path in Notheastern Estonia

Supercell and mesocyclone

Supercell in USA

Supercell in USA

Supercell in USA

Supercells in Estonia

Supercell in Estonia

Thunder observations in Estonia

• Few meteorological stations• Inserting lightning detectors• Detailed observations and information

from different places: over-Estonian volunteer thunderstorm observers network

Estonian thunderstorm observers network

Interactive European lightning maps

Interactive European lightning maps

Contact information:

Sven-Erik Ennoseenno@ut.ee