ESTOFEX Issues warnings for Widespread Storms

A shift in atmospheric conditions across Europe is expected to bring a period of intense weather, prompting the European Storm Forecast Experiment (ESTOFEX) to issue weather alerts effective from 8:00 UTC on May 3, 2025, to 8:00 UTC on May 4, 2025.[[3]]. The warnings highlight the potential for severe thunderstorms,large hail,strong winds,and heavy rainfall across several countries.

ESTOFEX, an organization dedicated to forecasting severe weather, provides crucial information to meteorologists across Europe [[3]]. While ESTOFEX offers forecasts, it is indeed critically important to remember that national meteorological services are responsible for issuing official warnings for specific regions [[3]].

regional Breakdown of Weather Alerts

• Level 2 Alert: Southwestern France faces the highest risk, with a Level 2 warning issued for the possibility of large to vrey large hail, powerful wind gusts, and torrential rains.
• Level 1 Alert: A broader level 1 alert is in effect for Central-Western and Eastern Europe, indicating a risk of various severe weather phenomena with potentially meaningful regional impacts.
• Iberian peninsula: Parts of southwestern Portugal and Spain are under a Level 1 alert, primarily for heavy rainfall and the possibility of isolated tornadoes.
• Eastern Spain: A Level 1 alert is also in place for Eastern Spain, with the main threats being large hail, strong wind gusts, and heavy rainfall.

Atmospheric Dynamics Driving the Storms

The ESTOFEX bulletin describes a complex and dynamic atmospheric situation across Central and Southwestern Europe, increasing the risk of locally severe thunderstorms. A weakening high-pressure system is allowing a new weather disturbance to move in. A surge of cooler air descending from Scotland towards the Baltic Sea is interacting with a cyclonic area over Scandinavia.This interaction is generating a fresher, more stable airflow from the northwest, while an unstable air mass extends from France to Ukraine. The collision of warm,humid air with colder air along this front is creating conditions favorable for thunderstorm development,especially across France,Germany,Austria,Poland,and Ukraine.

Specific Threats and Areas of concern

The forecast emphasizes the likelihood of scattered thunderstorms, some of which could be severe, bringing the risk of hail, intense wind gusts, and, in localized areas, tornadoes, especially across central Germany and Poland. Southwestern france is particularly vulnerable due to high Convective Available Potential Energy (CAPE), which supports the development of intense storm cells capable of producing very large hail. Southern Austria and the alpine region could also experience persistent supercell thunderstorms.

Timing and Potential for Organized Storm Systems

Atmospheric instability is expected to peak during the afternoon hours, with a gradual decrease in storm activity anticipated in the evening.Though, some weather models suggest the potential for a more organized mesoscale convective system (MCS) to develop between southern Germany and the Czech Republic, bringing the risk of heavy rainfall and localized flooding.

Othre Areas at Risk

Northeastern Spain and portugal could also see isolated thunderstorms with hail and wind, even though the likelihood of severe events is considered lower in these regions.

A Wider Trend of Extreme Weather

This severe weather forecast comes amidst a backdrop of increasing extreme weather events across Europe. As recently as June 2024, Europe faced a barrage of extreme conditions, including record-breaking heatwaves and severe storms [[2]]. Serbia and Romania endured scorching temperatures reaching 40°C, while Germany grappled with severe thunderstorms [[2]]. These events highlight the growing need for accurate and timely weather forecasting to mitigate the impacts of extreme weather.