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- We have now reached the release candidate phase of the implementation of the new IFS Cycle 46r1.
- IFS cycle 46r1 test data is available in dissemination.
- Changes in some Cycle 46r1 data are highlighted.
- The expected date for the operational implementation of IFS cycle 46r1 is . We will confirm this date early in May.
- The second set of live-streamed seminars for cycle 46r1 will take place on at 09:30 BST and on at 17:00 BST.
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The following evaluation of the new cycle is based on the alpha testing.
Weather parameters and waves
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Extended output have been added in cycle 46r1, including a subset of ocean fields on the atmospheric grid.
paramId | shortName | name | Description | units | GRIB edition | Components | Test data available | Dissemination | ecCharts | Added to the Catalogue |
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Near-surface wind output | ||||||||||
228239 | 200u | 200 metre U wind component | eastward component of the 200m wind. | m s-1 | 1 | HRES / ENS |
TBC | ||||||||
228240 | 200v | 200 metre V wind component | northward component of the 200m wind. | m s-1 | 1 | HRES / ENS |
TBC | ||||||||||
Wave model parameters | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
140098 | weta | Wave induced mean sea level correction | Wave induced mean sea level correction | m | 1 | HRES-WAM / HRES-SAW / ENS-WAM |
TBC | ||||||||
140099 | wraf | Ratio of wave angular and frequency width | Ratio of wave angular and frequency width | dimensionless | 1 | HRES-WAM / HRES-SAW / ENS-WAM | TBC |
TBC | ||||||||
140100 | wnslc | Number of events in freak waves statistics | Number of events in freak waves statistics | dimensionless | 1 | HRES-WAM / HRES-SAW / ENS-WAM |
TBC | ||||||||
140101 | utaua | U-component of atmospheric surface momentum flux | U-component of atmospheric surface momentum flux | N m-2 | 1 | HRES-WAM / HRES-SAW / ENS-WAM |
TBC | ||||||||
140102 | vtaua | V-component of atmospheric surface momentum flux | V-component of atmospheric surface momentum flux | N m-2 | 1 | HRES-WAM / HRES-SAW / ENS-WAM |
TBC | ||||||||
140103 | utauo | U-component of surface momentum flux into ocean | U-component of surface momentum flux into ocean | N m-2 | 1 | HRES-WAM / HRES-SAW / ENS-WAM |
TBC | ||||||||
140104 | vtauo | V-component of surface momentum flux into ocean | V-component of surface momentum flux into ocean | N m-2 | 1 | HRES-WAM / HRES-SAW / ENS-WAM |
TBC | ||||||||
140105 | wphio | Wave turbulent energy flux into ocean | Wave turbulent energy flux into ocean | W m-2 | 1 | HRES-WAM / HRES-SAW / ENS-WAM | TBC |
TBC | ||||||||||
Ocean parameters available at the surface, produced by the NEMO model. | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
174098 | sithick | Sea-ice thickness * | Sea-ice thickness | m | 1 | HRES / ENS |
TBC | ||||||||
151148 | mld | Mixed layer depth * | Mixed layer depth | m | 1 | HRES / ENS |
151145 | zos | Sea surface height * | Sea surface height | m | 1 | HRES / ENS |
151163 | t20d | Depth of 20C isotherm * | Depth of 20C isotherm | m | 1 | HRES / ENS |
151130 | so | Sea water practical salinity * | Sea water practical salinity | psu | 1 | HRES / ENS |
151164 | tav300 | Average potential temperature in the upper 300m * | Average potential temperature in the upper 300m | degrees C | 1 | HRES / ENS |
151175 | sav300 | Average salinity in the upper 300m * | Average salinity in the upper 300m | psu | 1 | HRES / ENS |
* All fields are masked on land and lake points. tav300 and sav300 are masked on ocean points with depth < 300m. | ||||||||||
Parameters on Potential Vorticity levels (1.5 and 2 PVU) | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
129 | z | Geopotential | This parameter is the gravitational potential energy of a unit mass, at a particular location, relative to mean sea level. | m2 s-2 | 1 | HRES / ENS * |
TBC | ||||||||
203 | o3 | Ozone mass mixing ratio | This parameter is the mass of ozone per kilogram of air. | kg kg-1 | 1 | HRES / ENS * |
TBC | ||||||||
3 | pt | Potential Temperature | Potential Temperature | K | 1 | HRES / ENS * |
TBC | ||||||||
54 | pres | Pressure | Pressure | Pa | 1 | HRES / ENS * |
TBC | ||||||||
133 | q | Specific humidity | This parameter is the mass of water vapour per kilogram of moist air. | kg kg-1 | 1 | HRES / ENS * |
TBC | ||||||||
131 | u | U component of wind | This parameter is the eastward component of the wind. It is the horizontal speed of air moving towards the east, in metres per second. A negative sign thus indicates air movement towards the west. | m s-1 | 1 | HRES / ENS * |
TBC | ||||||||
132 | v | V component of wind | This parameter is the northward component of the wind. It is the horizontal speed of air moving towards the north, in metres per second. A negative sign thus indicates air movement towards the south. | m s-1 | 1 | HRES / ENS * |
TBC | ||||||||||
* The perturbed forecasts for the ENS only contain the parameters pt, u and v. | ||||||||||
Ensemble probabilities | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
131098 | tpg25 | Total precipitation of at least 25 mm | Total precipitation of at least 25 mm | dimensionless | 2 | ENS |
TBC | ||||||||
131099 | tpg50 | Total precipitation of at least 50 mm | Total precipitation of at least 50 mm | dimensionless | 2 | ENS |
TBC | ||||||||
131085 | tpg100 | Total precipitation of at least 100 mm | Total precipitation of at least 100 mm | dimensionless | 2 | ENS |
TBC | ||||||||
131100 | 10fgg10 | 10 metre wind gust of at least 10 m/s | 10 metre wind gust of at least 10 m/s | dimensionless | 2 | ENS |
TBC | ||||||||
133093 | ptsa_gt_1stdev | Probability of 850hPa temperature standardized anomaly greater than 1 standard deviation | Probability of temperature anomaly greater than 1 standard deviation of the climatology. | dimensionless | 2 | ENS |
133094 | ptsa_gt_1p5stdev | Probability of 850hPa temperature standardized anomaly greater than 1.5 standard deviation | Probability of temperature anomaly greater than 1.5 standard deviation of the climatology. | dimensionless | 2 | ENS |
133095 | ptsa_gt_2stdev | Probability of 850hPa temperature standardized anomaly greater than 2 standard deviation | Probability of temperature anomaly greater than 2 standard deviation of the climatology. | dimensionless | 2 | ENS |
133096 | ptsa_lt_1stdev | Probability of 850hPa temperature standardized anomaly less than -1 standard deviation | Probability of temperature anomaly less than -1 standard deviation of the climatology. | dimensionless | 2 | ENS |
133097 | ptsa_lt_1p5stdev | Probability of 850hPa temperature standardized anomaly less than -1.5 standard deviation | Probability of temperature anomaly less than -1.5 standard deviation of the climatology. | dimensionless | 2 | ENS |
133098 | ptsa_lt_2stdev | Probability of 850hPa temperature standardized anomaly less than -2 standard deviation | Probability of temperature anomaly less than -2 standard deviation of the climatology. | dimensionless | 2 | ENS |
Ensemble mean / Ensemble standard deviation | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
10 | ws * | The speed of horizontal air movement in metres per second. | The speed of horizontal air movement in metres per second. | m s-1 | 1 | ENS |
TBC | ||||||||
130 | t * | This parameter is the temperature in the atmosphere. | This parameter is the temperature in the atmosphere. | K | 1 | ENS |
TBC | ||||||||||
* These parameters have been added at 250 hPa. | ||||||||||
Extreme Forecast Index (EFI) & Shift Of Tails (SOT) | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
132045 | wvfi | Water vapour flux index | EFI and SOT for water vapour flux | dimensionless | 1 | ENS |
TBC | ||||||||
132167 | 2ti | 2 metre temperature index | EFI and SOT for weekly mean temperature (out to week 6) | dimensionless | 1 | ENS-EXTENDED | TBC |
TBC | ||||||
132228 | tpi | Total precipitation index | EFI and SOT for 1 week total precipitation (out to week 6) | dimensionless | 1 | ENS-EXTENDED |
Software
ecCodes
TBC | TBC |
Changes in Cycle 46r1 data
EFI/SOT in the extended-range
With Cycle 46r1, the EFI and SOT become available in the extended-range forecast for two parameters: 7-day mean of 2m temperature and 7-day total precipitation. In contrast to the medium range, the model climate is derived from a set of 3 (rather than 9) re-forecast run dates, centred on the date of the real-time forecast initialisation (all are from 00UTC). The climate sample size is therefore much smaller and comprises 660 values compared to 1980 used in the medium range, but this does make the EFI and SOT consistent with other climate-related products from the extended-range forecasts, such as anomalies and probabilities.
New climatology for 850hPa Temperature anomaly probabilities
The outdated fixed climatology for computing historical 850hPa temperature anomaly probability parameters 131020 (talm2), 131021 (tag2), 131022 (talm8), 131023 (talm4), 131024 (tag4) and 131025 (tag8) is replaced by a new re-forecast-based climatology. The same climatology is also used to compute the Cycle 46r1 new (standard-deviation-related) 850hPa temperature anomaly probability parameters listed above. The new climatology is much more compatible with the real-time forecast.
A change to the computation of maximum CAPE and maximum CAPE-shear parameters
The two parameters 228035 (mxcape6) and 228036 (mxcapes6) namely “maximum CAPE in the last 6 hours” and “maximum CAPE-shear in the last 6 hours” respectively implemented with cycle 45r1, were computed in a complex way by combining hourly output of the model’s instantaneous CAPE (paramID=59) and CAPE-shear (paramID=228044) with a different type of CAPE, based on virtual temperature, that is used more directly by the model parametrisation where convection is active. This way of computing mxcape6 and mxcapes6 is inconsistent with the standard, instantaneous CAPE and CAPE-shear output fields provided by ECMWF hitherto. So to achieve more consistency, from cycle 46r1 we will change the mxcape6 and mxcapes6 variables to be based solely on the standard instantaneous hourly values of CAPE and CAPE-shear.
Software
ecCodes
ecCodes version 2.12.5 provides full support for the new model output parameters introduced in IFS Cycle 46r1.
Magics
Magics version 4.0.3 provides full support for the new model output parameters introduced in IFS Cycle 46r1.
Metview
Metview version 5.5.3 ecCodes version 2.12.5 provides full support for the new model output parameters introduced in IFS Cycle 46r1.
Info |
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ECMWF will update its software packages to the above listed versions on |
Availability of test data from the IFS cycle 46R1 test suites
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Date | Reason for update |
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| Initial version |
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