Richard Dixon wrote:
Tudor Hughes wrote:

In "Weather", March 1975, there is a short article (M W Stubbs)
on an unusually deep Low that passed more or less directly over OWS "D"
(44N, 41W) at 2025Z on 29 Jan 1972. The lowest pressure recorded was
947.5 mb. At 2000Z the pressure was 955.3, 3-hr tendency -35.0 mb.
From various other figures quoted one can deduce that the 3-hr tendency
at 2025Z was -41 mb. At 2025Z the pressure then rose 22.6 mb in 35
minutes(!), and the 2100Z ob shows 340°/85 kn, sky obscured, heavy
showers, pressure 970.1 mb. At 2300Z, the last ob quoted, the
pressure was 987.8 mb, tendency +32.5 in 3 hrs. Extrapolating to
2325Z, the 3-hr tendency would be +40 to +41 mb.

Thanks Tudor - pretty extraordinary figures. I'm wondering if the
Icelandic report is the biggest pressure rise over land. I struggle to
believe the 59m/s sustained wind report however (109kts, if I'm not
wrong?) !

Cheers
Richard


Thanks for that. I was on duty that day (or night, I cant remember but
34 years ago, I now feel very old). We found a blank barograph chart in
the store room, and plotted the trace for the 36 hour period. It was
very difficult to get the detail right, as the pressure had risen and
fallen by 20mb or more in about the width of the pen we were using. But
it was an amazing trace and for a time I did have a written copy of the
observations we received, but that seems to have been lost. We tried to
imagine what life must have been like on the ship that day - rather
them than me.