Compare our forecasts with observation data for the last days with our short-term Verification for Heidelberg.

Comparison of weather models for Heidelberg

The blue lines correspond to the forecasts computed by different high-resolution weather models. Also shown are the members of a traditional ensemble prediction, where the same weather model (GFS) is run several times with slightly different initial conditions, to reflect uncertainties in the observations required to run a forecast model. The GFS members have been downscaled and bias corrected to match local weather conditions, data from the high-resolution models is untouched.

  • In the top graph, the temperature forecast for Heidelberg is shown using light blue for different high-resolution models and purple for the GFS ensemble members. The black line represents the best-fit temperature forecast as shown on our start page. The dashed lines show the GFS and ECMWF ensemble mean temperatures.
  • The 2nd graph shows the accumulated precipitation forecast, that is the total amount that falls from today up to the date shown on the time axis. The blue bars show hourly precipitation sums.
  • The 3rd graph is forecast cloud cover in percent using light blue for the high-resolution weather models and green for the GFS ensemble members.
  • The 4th graph indicates the wind forecast as computed by high resolution models (light blue) and by the ensemble prediction (green). Also shown is the daily wind direction summary in form of a wind rose. Larger segments indicate that this wind direction is more likely and more frequent over the day than directions having smaller segments. If you have many segments of all about equal size than the forecast of wind direction is very uncertain. If there are predominantly two opposing directions this often indicates a thermal wind circulation where wind blows from a different direction during the day than at night.

Why do we show a traditional ensemble forecast and a multi model forecast at the same time?

A traditional ensemble (e.g. GFS) computed with the same forecast model often underestimates the uncertainties in the weather for the first 3 to 5 days thus overestimating the confidence in the forecast. Furthermore, the traditional ensemble is run at much lower resolution, thus neglecting some of the local weather phenomenon, which can be seen in high resolution models. It is very important to note, that all members of a traditional ensemble have the same likelihood of being true (there is no way to tell in advance which one will be better). This contrasts with the high-resolution models, where some deliver better forecasts than others depending on the location and weather conditions.

Weather models

Weather models simulate physical processes. A weather model divides the world or a region into small "grid-cells". Each cell is about 4km to 40km wide and 100m to 2km high. Our models contain 60 atmospheric layers and reach deep into the stratosphere at 10-25 hPa (60km altitude). The weather is simulated by solving complex mathematical equations between all grid cells every few seconds and parameters like temperature, wind speed or clouds are stored for every hour.

meteoblue operates a large number of weather models and integrates open data from various sources. All meteoblue models are computed twice a day on a dedicated High Performance Cluster.

Model Region Resolution Last update Source

NEMS model family: Improved NMM successors (operational since 2013). NEMS is a multi-scale model (used from global down to local domains) and significantly improves cloud-development and precipication forecast.

NEMS4 Central Europe 4 km 72 h 20:33 CEST meteoblue
NEMS12 Europe 12 km 180 h 21:26 CEST meteoblue
NEMS2-12 Europe 12 km 168 h 00:08 CEST meteoblue
NEMS-8 Central America 12 km 180 h 00:08 CEST meteoblue
NEMS12 India 12 km 180 h 22:13 CEST meteoblue
NEMS10 South America 10 km 180 h 23:54 CEST meteoblue
NEMS10 South Africa 10 km 180 h 22:59 CEST meteoblue
NEMS8 New Zealand 8 km 180 h 21:25 CEST meteoblue
NEMS8 Japan East Asia 8 km 180 h 21:03 CEST meteoblue
NEMS30 Global 30 km 180 h 20:23 CEST meteoblue
NEMS2-30 Global 30 km 168 h 01:45 CEST meteoblue

NMM model family: the first weather model from meteoblue (operational since 2007). NMM is a regional weather model and highly optimised for complex terrain.

NMM4 Central Europe 4 km 72 h 19:39 CEST meteoblue
NMM12 Europe 12 km 180 h 20:59 CEST meteoblue
NMM18 South America 18 km 180 h 23:04 CEST meteoblue
NMM18 South Africa 18 km 180 h 21:27 CEST meteoblue
NMM18 Southeast Asia 18 km 180 h 21:59 CEST meteoblue

Third-party domains: As seen on most other websites

ECMWF-IFS Global 20 km 144 h (@ 3 h) 23:15 CEST European Centre for Medium-Range Weather Forecasts (ECMWF)
ECMWF-ENS Global 30 km 360 h (@ 3 h) 23:34 CEST European Centre for Medium-Range Weather Forecasts (ECMWF)
UKMO-10 Global 10 km 144 h (@ 3 h) 21:11 CEST UK MET OFFICE
UKMO-2 UK 2 km 120 h (@ 3 h) 21:07 CEST UK MET OFFICE
ICON7 Europe 7 km 120 h (@ 3 h) 06:26 CEST Deutscher Wetterdienst
ICON13 Global 13 km 180 h (@ 3 h) 19:36 CEST Deutscher Wetterdienst
ICON2 Germany & Alps 2.2 km 48 h 04:17 CEST Deutscher Wetterdienst
GFS22 Global 22 km 180 h (@ 3 h) 06:32 CEST NOAA NCEP
GFS22 Global 40 km 180 h (@ 3 h) 06:50 CEST NOAA NCEP
GFSENS05 Global 40 km 384 h (@ 3 h) 22:13 CEST NOAA NCEP
NBM North America 2.5 km 180 h (@ 3 h) 06:31 CEST NOAA NCEP
HRRR US 3 km 18 h 06:29 CEST NOAA NCEP
NAM3 North America 3 km 60 h 18:05 CEST NOAA NCEP
NAM5 North America 5 km 60 h 19:22 CEST NOAA NCEP
NAM12 North America 12 km 84 h (@ 3 h) 05:09 CEST NOAA NCEP
FV3-5 Alaska 5 km 60 h 01:31 CEST NOAA NCEP
GEM2 North America 2.5 km 48 h 20:57 CEST Environment Canada
GEM15 Global 15 km 168 h (@ 3 h) 22:43 CEST Environment Canada
AROME2 France 2 km 42 h 06:14 CEST METEO FRANCE
ARPEGE11 Europe 11 km 96 h 06:04 CEST METEO FRANCE
ARPEGE40 Global 40 km 96 h (@ 3 h) 06:32 CEST METEO FRANCE
COSMO-5M Central Europe 5 km 72 h 21:31 CEST AM/ARPAE/ARPAP
COSMO-2I Central Europe 2 km 48 h 21:55 CEST AM/ARPAE/ARPAP
HRMN5 Central Europe 5 km 48 h 01:21 CEST KNMI
MSM5 Japan 5 km 78 h 01:26 CEST Japan Meteorological Agency
WRFAMS-7 South America 7 km 168 h 11:21 CEST CPTEC/INPE

Worldwide coverage

meteoblue domain overview meteoblue weather models cover most populated areas at high resolution (3-10km) and world wide at moderate resolution (30km). The map on the side displays NMM models as red and NEMS models as black boxes. Other colors show third-party models. Global models are not shown. For a single forecast, multiple weather models, statistical analysis, measurements, radar and satellite telemetry are considered and combined to generate the most probable weather forecast for any given location on Earth.

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