Atmospheric Rivers from a Compound Event Perspective

Guest blog by Alexandre Ramos, Instituto Dom Luiz, Portugal An Atmospheric River (AR) is a long, narrow, and transient corridor of strong horizontal water vapour transport that is typically associated with a low-level jet stream ahead of the cold front of an extratropical cyclone. The water vapour in ARs is supplied by tropical and/or extratropical moisture … Continue reading Atmospheric Rivers from a Compound Event Perspective

14th International Meeting on Statistical Climatology

These meetings, which have been held roughly every three years since 1979, are organized by independent statisticians, climatologists and atmospheric scientists. They facilitate communication between the climate and statistics communities and promote good statistical practice in climate and atmospheric science (see http://imsc.pacificclimate.org/). Abstract submission is now open. The deadline for abstract submission is February 20, 2019. … Continue reading 14th International Meeting on Statistical Climatology

Summary: Workshop on Correlated Extreme Events

Lead Organizers: Colin Raymond, Radley Horton Steering Committee: Amir AghaKouchak, Olivia Martius, Thomas Wahl, Jakob Zscheischler, Suzana Camargo, Alex Ruane, Adam Sobel, Michael Oppenheimer, Noah Diffenbaugh, Sonia Seneviratne This workshop took place at Columbia University (New York, USA) on May 28-31. It was designed to bring together the communities of researchers studying extreme events connected … Continue reading Summary: Workshop on Correlated Extreme Events

Workshop on Correlated Extremes at Columbia University

This workshop aims to bring together a broad and diverse range of climate scientists, societal-impacts researchers, and policymakers to establish what is currently known about correlated climate extremes, and to forge promising new paths. These include a wide array of events: those which are extreme in multiple variables ('compound'); those which are simultaneous but separated in … Continue reading Workshop on Correlated Extremes at Columbia University

Meteorological and agricultural hazards in high drought risk scenarios

Guest blog by Edoardo Vignotto, University of Geneva, Switzerland Statistical modelling of extreme climatological events has recently gained a lot of interest. These events may occur in many different situations, often with dramatic consequences. Some examples are flooding, heat waves, extreme wind speeds, spatially concurring rainfall and long drought periods. In all these cases, it … Continue reading Meteorological and agricultural hazards in high drought risk scenarios

The compound event of heavy rainfall combined with snow-melt in southern Norway

Guest blog by Benjamin Poschlod Southern Norway is regularly exposed to floods triggered by heavy precipitation and snow-melt. A combination of high temperature leading to snow-melt and heavy rainfall is an example of a compound event, which leads to severe flooding when run-off due to snow-melt adds to river discharge from the rainfall. These compound … Continue reading The compound event of heavy rainfall combined with snow-melt in southern Norway

Investigating climate change impact on Rain-On-Snow events

Guest blog by Cenk Sezen Rain-on-snow events Rain-on-snow (ROS) floods, that is, the combined occurrence of snowmelt and rainfall events can cause huge economic impacts and endanger human lives due to a significant increase in the magnitude of runoff compared to only snowmelt or only rainfall events. Forecasting of ROS floods is difficult because of … Continue reading Investigating climate change impact on Rain-On-Snow events

Towards a categorisation of statistical methods to study compound events

Many extreme impacts on society are caused by compound events, which were recently defined as a combination of multiple drivers and/or hazards contributing to societal or environmental risk. Compound events include, for example, concurring precipitations and storm surges causing flooding along low-lying coastal areas; heatwaves enhanced by drought conditions; strong wind episodes combined with drought … Continue reading Towards a categorisation of statistical methods to study compound events

Workshop on physical modeling supporting a “storyline approach”

While narratives or storylines have been used for decades in social sciences and beyond (e.g. RCPs, SSPs, economic risk assessment), the concept of analyzing and communicating high-impact weather extreme events in the climate change context via storylines has recently gained quite some popularity in the climate modeling community. Storylines are also a useful way to … Continue reading Workshop on physical modeling supporting a “storyline approach”

Session report: Understanding and modelling compound climate and weather events and their impacts

Chairperson: Bart van den Hurk Conveners: Nina Nadine Ridder | Co-conveners: Bart van den Hurk, Philip Ward, Seth Westra, Jakob Zscheischler, Samuel Jonson Sutanto, Claudia Vitolo, Henny A.J. Van Lanen This is a short summary of the oral session at the EGU 2019 where once again this year a session on understanding and modelling compound … Continue reading Session report: Understanding and modelling compound climate and weather events and their impacts