European Centre for Medium-Range Weather Forecasts (ECMWF) Storm Trajectories

This data set consists of 5 day back trajectories computed on a
routine basis using analyses from the European Centre for Medium-Range
Weather Forecasts (ECMWF). The trajectories are calculated at ECMWF using 6
hourly T106 operational analyses of the three components of the wind
and surface pressure which are interpolated on to a 1.5 x 1.5 degree
grid. The data are linearly interpolated in time and space. The output
data consist of latitude, longitude and pressure of the trajectory
every 30 minutes.

1. 252 back trajectories which are launched at 900 mb from points on
three regular latitude / longitude grids centred over the UK., the
mid-Atlantic storm track region and the eastern U.S.A. The data set
runs from 1979 to February 1999. The back trajectories were lauhnched
at 12.00. In addition during 1996 and 1997, as part of the ACSOE
campaign, the 12.00 releases were supplimented by releases at 00.00,
6.00, and 18.00.

2. Clusters of back trajectories launched from pre-defined instrument
sites in the UK - Weybourne (52.95N, 1.13E), Great Dunn Fell (54.68N,
357.55E), Bush Estate (55.50N, 356.80E), Aberystwyth (52.42N, 356.00E)
Mace Head (53.32N, 350.10E) and in the Irish Sea west of Mace Head
(53.00N, 346.00E). These trajectories are launched 4 times per day
from 4 different pressure levels (700, 850, 950 and 1000 mb). The data
set covers the period of the ACSOE campaign (1995-1997).

3. Global back trajectories on a 20 by 36 lat-long grid - the grid is
not regular in latitude. This grid is repeated on 9 pressure levels
(approx 950, 850, 750, 650, 550, 450, 350, 250, 150 and 50 mb). This
data set covers the period 1997-February 1999.

Link to the ECMWF Trajectories data set home page for documentation
and information about how to obtain the data.
"http://www.badc.rl.ac.uk/data/ecmwf-trj/"

BADC Home Page:
"http://www.badc.rl.ac.uk"

[Summary Extracted from the BADC Home Page]