The Ulysses storm with the weatherrescue observations

The Ulysses storm with the weatherrescue observations

Two reconstructions of the Ulysses storm that hit the British Isles in February 1903: mean-sea-level pressure (mslp) contours from the Twentieth Century Reanalysis version 3 (left), and a scout run using new observations from weatherrescue.org (right).

The thicker black lines are contours of the ensemble mean. The green shading is an estimate of the uncertainty in the contour locations – effectively it serves as an error-bar for the contour. The yellow dots mark pressure observations assimilated while making the field shown.

The 20th Century Reanalysis version 3 and the scout run (4.6.1) are produced by the University of Colorado CIRES and the Physical Sciences Division of NOAA’s Earth System Research Laboratory using the U.S. Department of Energy NERSC supercomputer Cori, with support from the U.S. Department of Energy’s Office of Biological and Environmental Research and from NOAA. 20CR is facilitated by an international group of partners led by the Atmospheric Circulation Reconstructions over the Earth initiative.

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