Royal Dutch Meteorological Institute; Ministery Of Infrastructure And The Environment

Updated @ 2020-10-20 09:40 utc
EARS ASCAT-A Coastal product
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Background information
Near real time Wind Products
OSI SAF Wind Climate Data Records
Discontinued Wind Products
R&D work
Related links
Product status: operational
Ascending passes
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Descending passes
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02-Sep-2019 The EARS ASCAT winds have been unavailable between 31 August 12:00 and 2 September 12:00 UTC due to a ground segment anomaly.
05-Aug-2019 The ASCAT-A winds have been unavailable between 30 July 17:00 and 5 Aug 18:00 UTC sensing time due to a spacecraft anomaly.
05-Apr-2019 The EARS ASCAT winds have been unavailable between 4 April 13:00 and 5 April 6:00 UTC due to a ground segment anomaly.
25-Sep-2018 The CMOD7 Geophysical Model Function replaces CMOD5n for wind retrieval; stress-equivalent ECMWF model background winds are used instead of real 10m winds. AWDP version is 3_2_01.
29-May-2017 The ASCAT-A winds have been unavailable between 27 May 2:06 and 29 May 11:30 UTC sensing time due to an instrument anomaly.
28-Jan-2017 The ASCAT-A EARS winds have been unavailable on 28 January between 16:45 and 21:56 UTC sensing time due to a EUMETCAST dissemination outage.
04-Dec-2016 The ASCAT-A winds have been unavailable on between 3 December 19:54 and 4 December 1:30 UTC sensing time due to a spacecraft anomaly.
18-Sep-2016 The ASCAT-A winds have been unavailable on 17 September between 11:33 and 17:57 UTC and between 17 September 19:30 and 18 September 14:15 UTC sensing time due to a power outage at KNMI.
22-Jul-2016 The ASCAT-A winds have been unavailable on 22 July between 0:21 and 10:11 UTC sensing time due to a spacecraft anomaly.
29-Mar-2016 The EARS 12.5 km wind products have been replaced by 12.5 km coastal wind products. ASCAT-A backscatter data correction to compensate for the instrument anomalies that occurred in autumn 2014. AWDP version is 2_4_01.
The ASCAT Wind Product contains measurements of the wind direction and wind speed above the sea surface. The measurements are obtained through the processing of scatterometer data originating from the ASCAT instrument on EUMETSAT's Metop-A satellite, as described in the ASCAT Wind Product User Manual.

The processing is done in near-real time. In the context of this regional service, the last 30 minutes of the ASCAT MetOp dump over the main acquisition ground station in Svalbard are processed jointly by the EARS ground system and KNMI. From the sensing time of the last measurement in a product, it takes approximately 15 minutes to get the corresponding wind product ready at KNMI. Since each product contains approximately 30 minutes of data, the timeliness of the oldest data in the products is about 45 minutes. For latitudes equivalent to Europe, the timeliness of the data is approximately 30 minutes, in line with the goals of the EARS service for products generated from satellite direct broadcast data. In addition to the Svalbard dumps, also data are acquired locally by a network of AHRPT stations, located within the North Atlantic, Europe and Indian Ocean regions.

This product in intended for nowcasting applications, where high timeliness and resolution are very important.

The last 22 hours of data are shown in two separate plots showing ascending and descending tracks, respectively. This is done to avoid overlap of data in the pictures. Note that also data from previous days can be displayed using the link on the right hand side. The overview plots show color coded wind speed measurements. If you click somewhere in the satellite track, a picture appears showing the scatterometer winds in more detail.

Product monitoring information in near-real time is available through the corresponding link on the right hand side.

Note: This web site is not supported on a 24x7 basis and it should not be considered operational.
Access to products
This wind product is available in BUFR format. The data are disseminated through the EUMETCast system; for access please contact EUMETSAT. The products are also available on a password protected FTP server (products of the last three days only). Contact the KNMI scatterometer team for access. The BUFR products are available on the Global Telecommunication System (GTS), as well. The messages are distributed to the Exeter node and can be identified by: header (T1T2A1A2ii) = ISXN[11-16]; CCCC = EHDB.

Note: All intellectual property rights of the OSI SAF and EARS products belong to EUMETSAT. The use of these products is granted to every interested user, free of charge. If you wish to use these products, EUMETSAT's copyright credit must be shown by displaying the words "copyright (year) EUMETSAT" on each of the products used.
The regional products are developed under the EUMETSAT Advanced Retransmission Service (EARS), a project by EUMETSAT and KNMI.

The processing software for the KNMI wind products is developed within the framework of the Numerical Weather Prediction Satellite Application Facility (NWP SAF) sponsored by EUMETSAT.