Climate change strikes: Lightning patterns change with global warming

This could lead to more lightning over mountains and in Northern Europe and less lightning over central Europe.

The Newcastle University and Met Office-led study, published in the journal Environmental Research Letters, finds there could be a picture of changing weather patterns including:

• More frequent storms with more energy, but locally less lightning mainly due to less cloud ice and frozen particles in storm clouds, with warming
• More lightning at high altitude -- including over the Alps
• Less lightning on lower terrain in central Europe and over the sea- subject to circulation changes, which are less certain

The researchers found these changes could lead to an increased risk of wildfires over the mountains and in Northern Europe but as the authors explain it's not all bad news.

Study lead author, Dr Abdullah Kahraman, Senior Researcher in Severe Weather and Climate Change, School of Engineering, Newcastle University and Visiting Scientist -- Understanding Regional Climate Change (URCC), Met Office Hadley Centre, said: "While more frequent lightning strikes over mountains and in Northern Europe might trigger more wildfires in higher level forests, we are going to see relatively fewer lightning hazards over more populated areas of Central Europe."

This is from the latest Met Office climate simulations with the highest local details in meteorological and topographical features down to 2km, which, unlike previous studies, allows individual thunderstorms and their crucial processes resulting in lightning to be simulated across Europe. This is one possible realisation of an unmitigated future climate (RCP8.5 scenario), and uncertainties exist especially in terms of circulation changes.

Professor Lizzie Kendon, Met Office Science Fellow and co-author on the paper, said that "These new very high-resolution climate projections, which have a resolution on a par with weather forecast models, are providing new insights into future changes in convective storms and their associated hazards -- such as heavy downpours, lightning, hail and wind gusts. Changes in lightning in this study are in contrast with previous studies. This shows us that representing the fundamental physical processes within storms themselves is important and can lead to future changes that are even of the opposite sign."

The researchers say these findings highlight the need to re-evaluate lightning risk to wildfires, properties, and human life across Europe.

Study co-author, Professor Hayley Fowler, Professor of Climate Change Impacts, Newcastle University School of Engineering, added: "This is just more bad news for critical national infrastructure in northern Europe, after the damning report 'Readiness for storms ahead? Critical national infrastructure in an age of climate change' by the Joint Committee on the National Security Strategy last week. Our paper has highlighted new risks from increases in lightning, previously unknown, which will require increased investment in climate adaptation measures. Further analysis is needed of the potential impact of these increases in lightning on energy and other critical infrastructure systems to enable policies and measures to be produced that are locally- and sector-relevant for adaptation planning."