On 8 March 2016, ECMWF upgraded the horizontal resolution of its integrated forecasting system (IFS) including its high-resolution (HRES) and ensemble (ENS) forecasts.The upgraded horizontal resolution is about 9 km for the HRES and the data assimilation (the outer loop of the 4D-Var) and about 18 km for the ENS up to day 15 and about 36 km for the extended range (monthly). The resolution of the ensemble of data assimilations (EDA) is increased to 18 km.
Implemented: 8 March 2016. |
10 March 2016IFS cycle 41r2 has been implemented successfully in ECMWF operations. For further information see New forecast model cycle brings highest-ever resolution. The first run with the new cycle was the 06 UTC "Boundary Condition" cycle on Tuesday 8 March 2016. The monthly forecast extension to the ensemble will be run with the new IFS cycle for the first time on Thursday 10 March 2016. As announced previously, the IFS cycle 41r2 Ensemble re-forecasts for Thursday 10 March remain available in the test dissemination system as expver=69. They are also available in MARS with expver=1. So far, two issues with products from the new cycle have been reported:
ECMWF would be grateful for any further feedback from forecast users about data from the new cycle. Finally, ECMWF wishes to thank all users for their efforts to prepare their systems for the change by using our test datasets. 1 March 2016
The first operational run using the new cycle will be the 06 UTC analysis and forecast in the Boundary Conditions Optional Programme on 8 March followed by the 12 UTC main assimilation and forecast. The monthly forecast extension to the ensemble will be run with the new IFS cycle for the first time the following Thursday 10 March 2016.
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The planned timetable for the implementation of IFS cycle 41r2 is as follows:
Date | Event |
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4 Nov 2015 | Initial announcement to Member States and other forecast users |
8 Dec 2015 | Availability of test data in dissemination |
14 Jan 2016 | Test data in dissemination available at upgraded resolution |
9 Feb 2016 | Update of default software versions at ECMWF |
8 Mar 2016 | Expected date of implementation |
The timetable represents current expectations and may change in light of actual progress made.
Resolutions in bold increased/changed from previous IFS cycle.
Component | Horizontal resolution | Vertical resolution | ||
Atmosphere | HRES | O1280 | ~9 km | 137 |
ENS | O640 | ~18 km | 91 | |
ENS extended | O320 | ~36 km | 91 | |
Wave | HRES-WAM | 0.125° | ~14 km | - |
HRES SAW | 0.1° | ~11km | ||
ENS-WAM | 0.25° | ~28 km | - | |
ENS-WAM Extended | 0.5° | ~55 km | - | |
Ocean | NEMO 3.4 | 0.25° | ~28 km | 75 |
The main contents of IFS cycle 41r2 are:
These upgrades
See more details of the meteorological content of cycle 41r2 ...
See details of meteorological impacts of Cycle 41r2.
Comparison of scores between IFS cycle 41r2 and IFS cycle 41r1 for HRES and ENS can be found in the IFS cycle 41r2 scorecard.
See new and changed parameters within the technical changes section.
See details of technical changes in Cycle 41r2.
See details of time-critical applications within the technical changes section.
4 November 2015 |
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8 December 2015 |
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22 December 2015 |
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23 December 2015 |
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14 January 2016 |
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10 February 2016 |
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1 March 2016 |
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10 March 2016 |
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28 July 2016 |
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