In focus

ECMWF NINO3.4 plot from 1 November 2022

Fact sheet: Sub-seasonal and seasonal predictions

ECMWF issues sub-seasonal weather predictions up to 46 days ahead. They are ensemble forecasts, and they show predicted week-to-week changes in the weather. Seasonal predictions are ensemble forecasts, too, and they are mainly issued up to seven months ahead.
From artificial intelligence (AI) to Explainable Artificial Intelligence (XAI)

Unlocking the black box: the potential of explainable AI in geoscience

The lack of transparency in many AI models in geoscience poses a barrier to their adoption. Revealing the factors that influence their actions, referred to as ‘Explainable Artificial Intelligence’ (XAI), demystifies how they work.
Earth observation system

Fact sheet: Earth system data assimilation

The quality of weather forecasts crucially depends on our ability to accurately estimate the current state of the Earth system. This Q&A explains how Earth system data assimilation enables us to make such estimates.
ECMWF at Living Planet Symposium 2025 graphic with globe background with grid network, and title

ECMWF at the Living Planet Symposium 2025

We are participating in the 2025 Living Planet Symposium from 23 to 27 June. Find out about our booth and which sessions our staff are involved in as speakers, poster presenters and conveners.
EGU flags in background. Text: "27 April - 2 May 2025. ECMWF at EGU General Assembly"

ECMWF at the EGU General Assembly 2025

We are participating in the European Geosciences Union (EGU) General Assembly from 27 April to 2 May. Find out which sessions our staff are involved in as speakers, poster presenters and conveners.

Destination Earth observations-simulations image

Fact sheet: ECMWF and the EU’s Destination Earth initiative

Destination Earth (DestinE) is an ambitious initiative of the European Union to develop a highly accurate digital twin of the Earth system by 2030. ECMWF is one of three entrusted entities to implement it by delivering digital twins and the Digital Twin Engine.

A submerged traffic light and Stop sign in flooded Budapest after the Danube rises following storm 'Boris'

Storm Boris and European flooding September 2024

In this article we look at the exceptional rainfall and flooding associated with storm Boris and discuss how well the forecasts from ECMWF and the European Flood Awareness System anticipated the event.
Orange sky with bright sun rays and some clouds

Monitoring the ozone layer – the role of the Copernicus Atmosphere Monitoring Service

On World Ozone Day, we look at the crucial role played by the Copernicus Atmosphere Monitoring Service in tracking the Antarctic ozone hole and providing vital data to help assess its path to recovery.
Illustration two people in conversation

Machine learning and physics in weather forecasting: a discussion between Alan Thorpe and Florian Pappenberger

Alan Thorpe, former Director-General at ECMWF, and Florian Pappenberger, our current Deputy Director-General and Director of Forecasts and Services, discuss the enormous opportunities and challenging issues for machine learning and weather forecasting.
Graphic saying GRIB2 with GRIB word cloud and code

Migration to GRIB2 data format: implications for users

For some time, ECMWF has been working towards using GRIB2 as the format for data output, bringing numerous benefits. Here we explore the advantages, the impact on users, and how to stay up-to-date with the migration progress.

Excerpt from a medium-range high-resolution forecast for Europe

Plans for high-resolution forecast (HRES) and ensemble forecast (ENS) control run

Since ECMWF medium-range ensemble (ENS) and high-resolution (HRES) forecasts now have the same horizontal resolution, we plan to stop using the term ‘HRES’. Find out about the time frame for this change.
Satellite image of globe against background of climate warming stripes. Text: ECMWF at the AMS Annual Meeting 2024

ECMWF at the AMS Annual Meeting 2024

At the American Meteorological Society (AMS) Annual Meeting 2024, ECMWF will present developments in areas including forecasting system improvements, data assimilation, our new AIFS data-driven model, data storage and extraction, open data, and global fire activity and emissions.
Digital image of a globe with a overlaid grid

ECMWF at the AGU Fall Meeting 2023

At the American Geophysical Union Fall Meeting, ECMWF will present developments in modelling for numerical weather prediction and fire risk, the Copernicus Climate and Atmosphere Data Store, data from the Year of Polar Prediction (YOPP), and work towards the European Green Deal Data Space.
Orange-yellow sand dunes. Overlaid text: ECMWF at COP28, UAE, 30 November to 12 December 2023

ECMWF at COP28

At COP28, ECMWF will discuss how, in collaboration with Member States and international partners, we can find new routes to better weather forecasts and early warning systems. We will also highlight how quality-assured data from the EU Copernicus services we run support national and global policy-making and climate action.
Atmosphere, climate, flood and wildfire images

Fact sheet: ECMWF and the EU’s Copernicus programme

ECMWF contributes to the EU's Copernicus Earth observation programme by running the Copernicus Atmosphere Monitoring Service and the Copernicus Climate Change Service, and by contributing to the Copernicus Emergency Management Service.
ECMWF at EMS Annual Meeting 2023 news item graphic

ECMWF at the EMS Annual Meeting 2023

An overview of ECMWF participation at the Annual Meeting of the European Meteorological Society (3–8 September 2023). Our scientists will discuss topics including probabilistic forecasting, weather and climate modelling, open data, machine learning, and the EU Destination Earth initiative.
Schematic of the reanalysis process

Fact sheet: Reanalysis

Reanalysis data provide the most complete picture currently possible of past weather and climate. This fact sheet explains what reanalysis is and what it is used for.
Global temperature lines for different years

July 2023 set to be hottest month on record – Copernicus and WMO

According to ERA5 data from the EU-funded Copernicus Climate Change Service implemented by ECMWF, the first three weeks of July have been the warmest three-week period on record and the month is on track to be the hottest on record, a press release issued by C3S and the World Meteorological Organization says.
ECMWF's high-performance computing facility

ECMWF high-performance computing facility boosts forecasts and research

In October 2022, ECMWF started to use its Atos high-performance computing facility. It has allowed the Centre to increase the resolution of its medium-range ensemble forecasts and to provide extended-range forecasts with more ensemble members.