thunderstorms and thunder observations sven-erik enno estonia 10.08.2005
DESCRIPTION
Structure of a thundercloudTRANSCRIPT
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
