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@ECMWF

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European Centre for Medium-Range Weather Forecasts For press enquiries or for general queries to the Service Desk, please visit

Shinfield, Reading, UK
Joined September 2011
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@ECMWF
ECMWF
4 years
From today, all ECMWF graphical products are free and accessible to all! Medium-range, extended-range and long-range forecast charts of temperature, wind, precipitation, clouds and ocean waves are just some of the products available. @CopernicusECMWF @WMO
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@ECMWF
ECMWF
6 years
A rare sight: Kelvin–Helmholtz clouds as seen from ECMWF's car park this morning.
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@ECMWF
ECMWF
4 years
Going live on 7 October: ECMWF is taking a major step towards making hundreds of its forecast maps free and available to all
@Parlimag
The Parliament
4 years
Early October will see @ECMWF & @CopernicusECMWF take a major step towards making hundreds of its forecast maps free and available to all. To find out more, visit:
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@ECMWF
ECMWF
10 months
📈🌡️ Global mean temperature exceeded 1.5 degrees threshold during the first days of June. Monitoring how often and for how long these breaches occur is more important than ever, if we are to avoid more severe consequences of the climate crisis. Read more:
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@ECMWF
ECMWF
6 years
After the successful launch of the @esa #Aeolus satellite, ECMWF scientists are getting ready to process the data that could bring a step change in the quality of weather forecasts around the globe.
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@ECMWF
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9 months
🌡️☀️Europe is experiencing some of the hottest conditions of summer 2023 so far, with some areas seeing temperatures above 45°C. Our latest blog explores some of the causes & impacts of this #heatwave & what we expect to happen during the rest of summer.➡️
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@ECMWF
ECMWF
2 years
We have just added 26 new Jupyter Notebooks to help users reproduce our #opencharts . Any charts with the @ProjectJupyter icon can be reproduced using our #opensource #Python tools on #MyBinder or #googlecolab Explore all our open charts at
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@ECMWF
ECMWF
10 months
🌦️💻Our #IFS48r1 #NewFCSystem is live, and it brings: ✔️ Increased resolution of medium-range ensemble #forecasts , from 18 to 9 km. ✔️ 101 instead of 51 ensemble members in the extended range. ✔️ Much-improved skill for all forecasts. More➡️
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@ECMWF
ECMWF
3 years
ECMWF Council today selected Bonn to host the Centre’s new and third site. Blown away by the quality of all nine proposals. Grateful for Member States support. Excited by this new phase in scientific collaboration. #OneECMWF
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@ECMWF
ECMWF
2 years
We are excited to announce that with the next upgrade of our Integrated Forecasting System, currently planned for late 2022, our ensemble forecast resolution will increase from 18 to 9 km. Look out for more information coming soon. #newfcsystem
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@ECMWF
ECMWF
4 years
The #COVID19 pandemic has cut the number of aircraft-based weather observations, with possible impacts on the quality of forecasts. Our web article has more details:
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@ECMWF
ECMWF
3 years
We have just added more than 50 new products to our #OpenCharts catalogue! These forecast charts are free for anyone to access, redistribute and adapt - even for commercial applications - part of our open data Strategy for 2021-2030. Dive in & explore...
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@ECMWF
ECMWF
2 years
Even more #OpenData now available! Data released today are based on a range of our high-resolution and ensemble forecasts, and can be accessed through our https service and via the @Microsoft @Azure cloud. More details from
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@ECMWF
ECMWF
4 years
The COVID-19 pandemic has had a severe impact on the amount of aircraft observations available to weather prediction models. Daily totals over Europe have decreased by around 80% (from around 50 000 per day down to 10 000) since flight restrictions came into force. @WMO
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@ECMWF
ECMWF
5 years
ECMWF’s new atmospheric reanalysis, #ERA5 , produced by @CopernicusECMWF , now provides a detailed picture of the global weather and climate back to 1979. It replaces the widely used #ERAInterim reanalysis.
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@ECMWF
ECMWF
2 months
ECMWF has released a much larger dataset to the public than before. It represents #WeatherForecasts at a higher resolution and includes a reduction in some release times. Find out more ➡️
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@ECMWF
ECMWF
6 months
Today we launch an important companion to the #IFS , the #AIFS , our #ArtificialIntelligence / #IntegratedForecastingSystem ; a component of our new #MachineLearning project. Follow our new blog to keep up with ongoing developments to this complementary model➡️
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@ECMWF
ECMWF
2 years
🌋Our monitoring of @eumetsat 's weather satellite data shows the shockwave from the volcanic eruption in Tonga. The IASI sensors on the #metop satellites are highly sensitive to temperature changes resulting from the wave. For more on satellite monitoring:
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@ECMWF
ECMWF
4 months
2023 was the warmest calendar year on record, close to 1.5°C above the pre-industrial level, according to @CopernicusECMWF . ➡️
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ECMWF
4 years
ECMWF has launched the first reanalysis dataset of weather-induced human thermal stress and discomfort. Available freely through the @CopernicusECMWF Climate Data Store, it provides hourly data at the global scale from 1979 to near real time:
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@ECMWF
ECMWF
5 years
ECMWF is implementing a substantial upgrade of its Integrated Forecasting System (IFS) today. Find out how the upgrade will improve our global weather forecasts and what is different in #IFS46r1 , including more continuous #DataAssimilation .
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ECMWF
4 years
ECMWF has launched the GloFAS v2.1 global river discharge reanalysis today, an @CopernicusEMS product. Available freely through the @CopernicusECMWF CDS providing daily river discharge information at the global scale from 1979 to near real time:
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@ECMWF
ECMWF
1 year
📊Today marks 30 years since we first produced ensembles at ECMWF. Now, they are at the core of medium, extended (monthly) & long (seasonal) range forecasts, providing a range of possible outcomes & the likelihood of weather events. ➡️ #30YearsOfENS 🧵
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ECMWF
3 years
Our next weather model 🌦️💻upgrade #IFS47r2 takes place TOMORROW Tuesday 11 May! #newfcsystem @ECMWF We have increased model levels in the ensemble (ENS) from 91 ->137! This is the same number as in our high resolution (HRES) model 🥳
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ECMWF
4 years
We could not have hoped for a better start to 2020 than announcing the operational use of wind data from the ground-breaking #Aeolus satellite: A big thank you to @esa @ESA_EO for making Aeolus happen, and Happy New Year to all.
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@ECMWF
ECMWF
8 months
To help assess #MachineLearning weather forecasts from different sources, we show a range of them in the ECMWF’s charts catalogue. At the same time, we are exploring the use of machine learning models to produce #EnsembleForecasts . ➡️
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@ECMWF
ECMWF
1 year
A new dataset puts river discharge and #flood events from 1980 to July 2022 at the fingertips of users. Find out more about the #GloFAS dataset, produced by the @EU_Commission 's @EU_ScienceHub and ECMWF as part of the @CopernicusEMS ➡️
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@ECMWF
ECMWF
5 months
Our ECMWF team is working hard to restore services to our users. Thanks for your patience.
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@ECMWF
ECMWF
3 years
It’s official! Today our Director General @FlorenceRabier signed an agreement with the @EU_Commission to continue implementing the #CopernicusClimate Change Service and #CopernicusAtmosphere Monitoring Service for another 7 years. Read more on our website
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@ECMWF
ECMWF
6 years
The recent #HeatWave2018 has seen extreme temperatures in many countries across Europe. The map shows ECMWF analysis of maximum temperatures from 29 July to 6 August 2018, expressed in Celsius.
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ECMWF
4 years
ECMWF scientists have been awarded time on the world’s most powerful supercomputer @OLCFGOV to carry out ground-breaking global weather and climate simulations at 1 km resolution over a season or even a year. Find out why this is important:
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ECMWF
4 years
The @WMO and ECMWF have launched a new web-based interface to help monitor the availability and quality of global #meteorological observations. Find out more here:
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ECMWF
2 years
Find out about the size of the 2021 Antarctic ozone hole, tracked by the EU-funded #CopernicusAtmosphere Monitoring Service (CAMS) run by ECMWF, and what it means for the long-term recovery of the ozone hole. @CopernicusECMWF
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ECMWF
3 years
Bonn to host ECMWF new facility from 2021. More details at #OneECMWF
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ECMWF
6 years
Four reasons to celebrate: 25 years of ensemble prediction, 25 years of wave forecasting, 20 years of 4D-Var data assimilation and 20 years of seasonal forecasts at ECMWF.
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ECMWF
6 years
A new product to predict lightning will be available from 5 June as part of the next upgrade of ECMWF's Integrated Forecasting System (IFS) @Blitzortung_Org .
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@ECMWF
ECMWF
3 years
Emotional moment as our Director-General @FlorenceRabier signs the handover of the new Bologna Data Centre to ECMWF and expresses gratitude for huge efforts in this project by the Italian authorities. An important milestone for ECMWF, our Italian partners, and our Member States.
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ECMWF
6 years
For small-scale but powerful weather systems such as the current #medicane over the Ionian sea, ECMWF is testing its Integrated Forecasting System (IFS) for the impact of the initial conditions and resolution on the forecast.
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@ECMWF
ECMWF
3 years
New #Python packages and training with #Jupyter notebooks are making it simpler to access and use vast weather and climate datasets from ECMWF and @CopernicusECMWF .
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ECMWF
6 years
The current snow depth in Scandinavia is the highest in the last 10 years according to ECMWF's new #ERA5 reanalysis.
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@ECMWF
ECMWF
3 years
‼️ #IFS47r3 goes live today #newfcsystem - increased satellite observation usage in cloudy regions - improved representation of moist physics - improved large-scale atmospheric circulation - reduced tropical cyclone track errors For more detail, visit
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ECMWF
2 months
Because our 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. ➡️
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@ECMWF
ECMWF
2 years
‼️Over 30 new vacancies open for applications‼️ 🌍🌐Join our team to work on #DestinationEarth - an ambitious initiative of the @EU_Commission to develop a highly accurate #DigitalTwin of our planet. Be part of the journey - explore the roles today
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@ECMWF
ECMWF
6 years
ECMWF is making more weather prediction data freely available to Members of the World Meteorological Organization @WMO . Find out what the extra data are and how they can be useful.
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ECMWF
1 year
🌍🌐 We are delighted to announce that @irinasandu_ec has been appointed to lead ECMWF activities in the EU-funded #DestinationEarth activities when Peter Bauer leaves ECMWF. #DestinE
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ECMWF
6 years
The warm and dry summer we’ve been seeing in parts of northern Europe means soil moisture is low in many areas. The map shows anomalies for 23 July 2018, based on the #ERA5 reanalysis, expressed as standard deviations compared to 2000–2017.
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@ECMWF
ECMWF
3 years
Tomorrow, we formally open our new data centre in #Bologna . It will enable: 🌐upgraded horizontal resolution of forecasts ❄️new multi-layer snow scheme 🗓️daily extended-range forecasts Link for event livestream coming soon! #OneECMWF
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@ECMWF
ECMWF
6 years
An example of a new product implemented this week at ECMWF - ensemble vertical profiles - is shown for a location in Croatia valid for 8 June 12 UTC. It can be used as guidance in forecasting deep moist convection even in the medium range.
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@ECMWF
ECMWF
3 years
Today, our new site officially opens in #Bonn and tomorrow, our new data centre opens in #Bologna . In our latest news article, find out what becoming a multi-site organisation means for us – including massively enhanced #supercomputing power. #OneECMWF
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@ECMWF
ECMWF
4 years
Science blog: Nils Wedi describes the first ever 1 km seasonal timescale simulation of the atmosphere, run on the fastest computer in the world (as of November 2019). @ORNL @OLCFGOV @doescience
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@ECMWF
ECMWF
5 years
Hurricane #Dorian stalled for more than 24 hours over the Bahamas. In ECMWF's forecasts this development was first reflected three to four days in advance, as shown here in the forecast from 12 UTC on 30 August.
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@ECMWF
ECMWF
5 years
The next upgrade of ECMWF’s Integrated Forecasting System is planned for June 2019. Director of Research Andy Brown will explain the changes and how they will improve forecasts in a webinar on 26 February and again on 7 March.
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@ECMWF
ECMWF
3 years
🚨 @ECWMF #IFS47r2 goes live today‼️ #newfcsystem It has: - Single Precision - Increased ENS model levels 91 ➡️137 - More frequent tropical cyclone tracks🌀 as WMO essential products - New parameters including UV🌞 and orography 🌄 Learn 📖 more:
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@ECMWF
ECMWF
6 years
20 years ago ECMWF started using the 4D-Var data assimilation technique. Find out how it works and why this was such an important step.
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ECMWF
6 years
Over 50 scientists will meet at ECMWF from 13–16 Nov to ‘shed light on the grey zone’ of weather model resolutions.
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ECMWF
6 years
ECMWF ensemble forecasts predicted the cut-off low that has caused extreme weather around the Mediterranean more than 2 weeks in advance.
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@ECMWF
ECMWF
3 years
Introducing ‘thermofeel’ - our new python library, which easily allows thermal comfort indices to be calculated. Thermofeel can show levels of heat stress across the world, such as the #heatwave in the USA & Canada 🌡️🥵 ➡️ #health #climatechange
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2 years
ECMWF is running a course on the use of #MachineLearning in the domain of #EarthScience from 3–6 May. This is just one of several machine learning initiatives summarised here: #learningofthemonth #ECLearn
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1 year
2022 saw the warmest summer and widespread drought in Europe, and there was a record melt of Greenland’s ice sheet, @CopernicusECMWF says. Find out more about the #ESOTC report ➡️
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@ECMWF
ECMWF
1 year
Want to learn more about #MachineLearning in #weather and #climate ? Together with @IFABfoundation we are creating a free online MOOC: 'Machine Learning in Weather & Climate'. Register now for the course starting in January 2023➡️
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@ECMWF
ECMWF
5 years
Jean-Noël Thépaut, the Head of the @CopernicusECMWF Climate Change Service, has been appointed as ECMWF’s new Director of Copernicus Services from 1 October 2019, when Juan Garces de Marcilla steps down from the post: @JeanNoelThepaut @CopernicusEU
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@ECMWF
ECMWF
3 years
'A digital twin of Earth for the green transition' Highly accurate models of the Earth can be used to understand environmental change and explore options for the future. ECMWF's Peter Bauer's co-authored paper is published today in @NatureClimate
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@ECMWF
ECMWF
5 years
The warmth experienced across Europe this week is reflected in ECMWF’s 2-metre maximum temperature Extreme Forecast Index on 27 February 2019 (left). The right-hand plot shows areas where similar temperature extremes were found globally on the same day.
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@ECMWF
ECMWF
3 years
🌍Next-generation models to produce digital twins of the Earth #DestinationEarth 🌐High-resolution ensemble forecasts ☁️Increased use of Cloud technologies 🏭Estimating & monitoring CO2 emissions 🤲Moving towards open data Our new Strategy for 2021-2030 is released tomorrow.
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@ECMWF
ECMWF
3 years
ECMWF has implemented an upgrade of its Integrated Forecasting System, including a move from double to single precision and an increase in the vertical resolution of ensemble forecasts. #IFS47r2 #newfcsystem Find out more here:
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@ECMWF
ECMWF
10 months
New science blog: #MachineLearning -based weather prediction models have developed rapidly over the last year with exciting results. A group of our scientists discuss developments and potential implications for the future ➡️ @LinusMagnusson5 @JesperDramsch
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@ECMWF
ECMWF
4 years
Satellite observations make a crucial contribution to the quality of today’s weather forecasts. Find out how ECMWF uses satellite data in the operational forecasting system and in research: @ESA_EO @ESA @esa_aeolus @eumetsat @JAXA_en @NOAA
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ECMWF
1 year
Last year was the 2nd warmest on record in Europe and the 5th warmest globally. Find these and other details in a summary of the #CopernicusClimate Change Service's & #CopernicusAtmosphere Monitoring Service's findings for 2022 ➡️
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@ECMWF
ECMWF
6 years
A new product of maximum predicted convective available potential energy (CAPE) over 6 hours will be available from 5 June as part of the next upgrade of ECMWF's Integrated Forecasting System (IFS). It will help in the prediction of severe convection.
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@ECMWF
ECMWF
3 years
Europe’s summer weather was extreme in more ways than one. We have taken a look at how great heat, regional fires, heavy rain and devastating floods were covered by ECMWF and the #Copernicus services we run or contribute to: @CopernicusECMWF @CopernicusEMS
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@ECMWF
ECMWF
3 years
We are delighted to see the Estonian flag 🇪🇪 flying at our Reading headquarters after #Estonia became a Member State, making our collaboration stronger and even more vibrant. Estonia was a Co-operating State since 2005 and joins our other 22 Member States.
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2 years
Honoured and delighted to have a high level bilateral meeting this week with @NOAA . Two days to discuss collaboration, in the context of our cooperation agreement.
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@ECMWF
ECMWF
4 years
The outcome of the @ITU World Radiocommunication Conference #WRC19 regarding 24 GHz observations is a big disappointment for ECMWF despite amazing work of @WMO on this and in reaching good outcomes on many other complex radio-frequency issues. @meteofrance
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@ECMWF
ECMWF
6 years
Some 30 years ago ECMWF embarked upon a major project to rewrite the computer code of its forecasting system. One of the key players in the project, Mats Hamrud, remembers why and explains what happened next.
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@ECMWF
ECMWF
6 years
The newly launched seasonal prediction system SEAS5 brings better forecasts, especially for El Niño/La Niña events.
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@ECMWF
ECMWF
3 years
Our hearts go out to all affected by the #flooding in Europe. @CopernicusEMS @CopernicusECMWF
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ECMWF
4 years
COVID-19 update: ECMWF confirms that its mission-critical activities are unaffected and data will continue to be made available to users in the usual way. Thanks to all staff for their continuing commitment to our mission.
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@ECMWF
ECMWF
3 years
Today at #vEMS2021 , learn about our move to #OpenData . We have already released hundreds of web forecast charts & made archived data available with a Creative Commons open licence, and are committed to move to an open data policy over the next few years.
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ECMWF
3 years
ECMWF will announce today the location of its new facility. Stay tuned. #OneECMWF
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ECMWF
3 years
🎉After more than two years of work, final preparations are underway for the opening of our new data centre in #Bologna today. #OneECMWF Join the livestream from 11:10 CEST/10:10 BST at
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ECMWF
4 years
In partnership with @Atos , we are opening a Center of Excellence in #HPC , #AI , and #Quantum Computing for Weather & Climate to support our work on medium- and long-range weather prediction and global climate modelling: @CopernicusECMWF
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@ECMWF
ECMWF
6 years
Science blog: Michael Rennie and Lars Isaksen look at how the novel space-based wind profile information from ESA’s #Aeolus satellite could improve weather forecasts. @esa @ESA_EO @KNMI
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@ECMWF
ECMWF
3 years
Our 10-year Strategy highlights our aim to focus on developing next-generation models to produce high-resolution #DigitalTwins of Earth. Yesterday, a paper by Peter Bauer was published in @NatureClimate to explore this in detail.
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@ECMWF
ECMWF
7 years
Sometimes winds can be just as strong when a hurricane re-intensifies as an extratropical storm. With #Ophelia land areas missed the worst.
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@ECMWF
ECMWF
2 years
To mark #WomenInScienceDay we are showcasing colleagues who were nominated for some extra recognition. To hear from some of the inspirational #WomenInScience at ECMWF, working across all areas of #forecasting , visit #February11
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@ECMWF
ECMWF
6 years
A new edition of the ECMWF Forecast User Guide is now available online, providing forecasters with the tools needed to interpret ECMWF products. #UEF2018
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@ECMWF
ECMWF
5 years
Ahead of #WorldMeteorologicalDay on 23 March, ECMWF Director of Research Andy Brown looks at how the theme of the Sun, the Earth and the Weather ties in with the Centre’s Earth system approach to numerical weather prediction. @WMO
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@ECMWF
ECMWF
3 years
Tropical cyclone tracks🌀 will be available more frequently as part of @ECMWF #newfcsystem #IFS47r2 : Tracks from 06 & 18UTC forecast cycles will be available as @WMO essential products in addition to 00 & 12UTC tracks #TCLaura #HurricaneLaura More info:
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@ECMWF
ECMWF
2 years
We have just launched a powerful new feature through our #OpenCharts Catalogue, allowing users to select from our 264 freely available products to tailor their own forecast display. Learn more in our latest article
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@ECMWF
ECMWF
2 years
🌍🌐Today, our governing council unanimously approved our involvement in the @EU_Commission 's #DestinationEarth ; an ambitious initiative to develop a highly accurate #DigitalTwinEarth . Learn more about our role in #DestinE at More will be announced soon.
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@ECMWF
ECMWF
2 years
The #HungaTonga volcano eruption in January had a strong impact on some satellite measurements monitored by ECMWF. Find out what we saw:
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@ECMWF
ECMWF
2 years
ECMWF is starting to make some of its Integrated Forecasting System available on an open-source basis, and the merits of moving the full forecast model to open source will be reviewed in consultation with Member States. Find out why here:
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@ECMWF
ECMWF
4 years
Tests show that new wind profile observations from the ground-breaking @esa #Aeolus satellite improve weather forecasts, and new insights on Aeolus biases could bring further gains.
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@ECMWF
ECMWF
3 years
Our #OpenCharts catalogue covers medium, extended and long-range forecast information. The new parameters added today include: ⚡️lightning flash density 🌫️visibility ☀️sunshine duration With over 50 new products, which ones will you use?
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@ECMWF
ECMWF
5 years
What if we could use satellite observations of cloud profiles to help determine the initial conditions on which weather forecasts are based? Recent results show that it can be done and that it would improve forecasts.
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@ECMWF
ECMWF
6 years
Sometimes even short-range forecasts go wrong, as in this example of windstorm Johanne, which affected Denmark a few weeks ago. Investigating cases like this is important for improving the forecasting system.
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@ECMWF
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1 year
🌍This first image from @eumetsat 's #MTGI1 reveals Earth in amazing detail. Our Head of Earth System Assimilation, Dr Tony McNally, says, “The new observations are a big step forwards. For example, they will better initialise #NumericalWeatherForecasts ." 🧵
@eumetsat
EUMETSAT
1 year
On 13 Dec 2022, #MTGI1 successfully launched into space. Since then, it's been busy settling into its new home 36,000km above our planet and now, we can reveal its very FIRST image 😱 Here's the first look at the #EarthfromSpace via MTG-I1 🛰️
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@ECMWF
ECMWF
6 years
The ECMWF Extreme Forecast Index (EFI) is used to identify anomalous weather. Unusually warm conditions in parts of Europe over the last few weeks are reflected in positive EFI values for 2-metre temperature on forecast day 1, averaged from 1 June to 18 July 2018.
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@ECMWF
ECMWF
6 years
Season's Greetings from everyone at ECMWF!
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