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Satellite images from yr.no valid 9,12 and 18 UTC on the 28 October.
The satellite sequence shows, perhaps unsurprisingly, all the hallmarks of an extreme extra-tropical cyclone, including evidence of a sting jet event. Notably, fingers of cold top cloud continue to emerge forwards from the tip of the cloud head, but evaporate as they descend (the 'smoking gun' effect). This happens first across S England, then on across the N Sea, and finally over S Denmark; thereafter there is evidence of cold top cloud surrounding the cyclone, as the cold conveyor phase of the maturing cyclone takes over. The cyclone seems to fit the model proposed by Keith Browning in his October 1987 sting jet (QJRMS) paper. As well as the evaporating cloud fingers note the evidence of sheets of slantwise upward motion extending NW from the low centre, with dry gap(s) inbetween. A second sheet develops at the start of the sequence, and relates also to intense rain at the surface. Notable for this event, compared to others I have looked at, is the duration of the apparent sting jet period - almost 12 hours it seems, rivalled only by Oct '87 (also about 12 hours). Caveats are need here though, as I am basing all this largely on IR sequence interpretation - ideally we would like to see trajectory analysis in very high resolution runs to complement this. A key point for ECMWF is whether or not the IFS can capture the strength of gusts characteristic of the sting jet phase.
The figure above shows the maximum reported wind gusts (coloured numbers) for the 28 October and the MSLP for every 6th hour (contours).
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