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UKCP Global (60km) - European Circulation Indices

Update Frequency: As Needed
Status: Ongoing
Online Status: ONLINE
Publication State: Published
Publication Date: 2020-10-22
Download Stats: last 12 months


A set of European Climate Indices calculated from UKCP Global (60km) projections from 1900-2100 under RCP8.5 produced by the Met Office in 2018 including:

1. Daily Atlantic jet stream latitude and strength

2. Daily 'weather pattern' classification - time-series of 1-8 or 1-30 weather patterns which are based on a classification scheme for the large scale synoptic situation.

3. Winter North Atlantic Oscillation (NAO) index - annual time series represents the seasonal mean NAO as the sea level pressure gradient between Gibraltar and Iceland.

Citable as:  Met Office Hadley Centre (2020): UKCP Global (60km) - European Circulation Indices. Centre for Environmental Data Analysis, date of citation.
Abbreviation: Not defined
Keywords: Jet Stream, Europe, Circulation, Clustering, Weather types, Weather patterns, Weather regimes, North Atlantic Oscillation, NAO, UKCP Global, UKCP, UKCP18


Previous Info:
No news update for this record
Previously used record identifiers:
No related previous identifiers.
Access rules:
Public data: access to these data is available to both registered and non-registered users.
Use of these data is covered by the following licence: When using these data you must cite them correctly using the citation given on the CEDA Data Catalogue record.
Data lineage:

Data provided by the UK Met Office

File Format:
Data are NetCDF formatted

Process overview

This dataset was generated by the computation detailed below.
Title Computation of UKCP Global (60km) - European Circulation Indices
Abstract The daily indices of the jet stream latitude and strength are calculated using the approach described in Woollings et al., 2010 ( This is calculated first by smoothing the tropospheric (850 hPa) zonal wind speed in the North Atlantic sector (0-60°W, 15-75°N) using a 5-day moving window. The location and magnitude of the maximum value in this smoothed daily field indicate the latitude and strength of the jet stream respectively. The daily weather type indices were generated by classifying daily mean sea level pressure (MSLP) (changes compared to the 1981-2000 average) into 30 weather regimes which capture the full range of circulation types affecting Europe (see Neal et al., 2016, These 30 weather patterns are also provided as an amalgamated set of 8 weather patterns. The winter NAO index is calculated as the seasonal mean (December-January-February) of the difference in sea level pressure between Iceland and Gibraltar (the Atlantic pressure gradient). These are calculated using the difference between the seasonal mean sea level pressure time-series between grid-boxes containing at Gibraltar (36.14N, 5.35E) and Iceland (65.07N, 22.7W).
Input Description None
Output Description None
Software Reference None
  • units: degrees
  • long_name: Latitude of eddy-driven jet
  • var_id: jetlat
  • names: Latitude of eddy-driven jet
  • units: m s-1
  • long_name: Strength of eddy-driven jet
  • var_id: jetstr
  • names: Strength of eddy-driven jet
  • units: 1
  • long_name: Weather type of 30
  • var_id: wtype30
  • names: Weather type of 30
  • units: 1
  • long_name: Weather type of 8
  • var_id: wtype8
  • names: Weather type of 8
  • units: hPa
  • long_name: Winter atlantic pressure gradient
  • var_id: naodjf
  • names: Winter atlantic pressure gradient
  • units: 1
  • long_name: day
  • var_id: day
  • names: day
  • units: 1
  • long_name: ensemble_member
  • var_id: ensemble_member
  • names: ensemble_member
  • units: 1
  • long_name: ensemble_member_id
  • var_id: ensemble_member_id
  • names: ensemble_member_id
  • var_id: latitude_bnds
  • var_id: longitude_bnds
  • units: 1
  • long_name: model_id
  • var_id: model_id
  • names: model_id
  • units: 1
  • long_name: month_number
  • var_id: month_number
  • names: month_number
  • var_id: plev_bnds
  • units: hPa
  • standard_name: air_pressure
  • long_name: pressure
  • var_id: plev
  • names: air_pressure, pressure
  • units: 1
  • standard_name: realization
  • var_id: realization
  • long_name: realization
  • names: realization
  • units: 1
  • long_name: season
  • var_id: season
  • names: season
  • units: 1
  • long_name: season_year
  • var_id: season_year
  • names: season_year
  • var_id: time_bnds
  • units: 1
  • long_name: year
  • var_id: year
  • names: year
  • units: 1
  • long_name: yyyymmdd
  • var_id: yyyymmdd
  • names: yyyymmdd

Co-ordinate Variables

  • units: degrees_north
  • standard_name: latitude
  • var_id: latitude
  • names: latitude
  • units: degrees_east
  • standard_name: longitude
  • var_id: longitude
  • names: longitude
  • long_name: time
  • standard_name: time
  • var_id: time
  • names: time
Temporal Range
Start time:
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Geographic Extent