Data4Risk: Red alerts for Corsica were issued one day before the derecho

An exceptionally rare windstorm battered Corsica on 18 August 2022, which formed east of the Spanish island of Majorca in the early morning and quickly traveled northeast, hitting Corsica after 8 am local time. 

Data4Risk provides an alerting system for thunderstorms, with 3 severity levels: a) Yellow for ordinary storms, b) Orange for storms that are capable of producing strong winds, heavy rain and hail, and c) Red for severe thunderstorms that can produce all kinds of extreme events. 

On 17 August, Red alerts were issued for all the postal codes of Corsica for the following day, based on AROME and ARPEGE numerical models provided by Météo-France, showing the potential of an extreme weather event in the morning on 18 August. All these alerts were sent to our customers right after their production. 

The Data4Risk Vision tool that provides an overview of the daily alerts to our customers, includes alerts for thunderstorms, heavy rain, severe winds, hail size, submersion, pollution and extreme temperatures. The map below shows thunderstorm alert levels with their timestamps on 17 and 18 August 2022, which were all issued on 17 August (model runs 00z, 06z, 12z and 18z). 

If you want to be weather-ready for the next natural disaster, get in contact with us to learn more about the D4Weather API and Vision tool: