"Norman Lynagh" wrote in message
...
N_Cook wrote:

On 17/01/2018 13:36, Norman Lynagh wrote:
It's all starting to happen! At Buoy 62095 (52.8°N 15.6°W) the
pressure at 1300z was 1003.9 mb. That's a fall of 7.9 mb in the
past 3 hours and a fall of 4.0 mb in the past hour. The wind has
backed to SSW Force 6.


At least GFS, in the last day or so of cogitations on no-name storm,
has knocked back its UK air-space "storm motion" from over 90mph to a
bit less . Shifting the 90mph priviledge to Holland, well the 06Z
run anyway.

At 1400z the pressure at Buoy 62095 was 999.3 mb. That was a fall of
11.0 mb in 3 hours and 4.6 mb in 1 hour. Either the system is moving
very fast or deepening rapidly or, more likely, a bit of both.

--
Norman Lynagh
Tideswell, Derbyshire
303m a.s.l.
https://peakdistrictweather.org
Twitter: @TideswellWeathr

Its an interesting and fairly extreme example of an almost pure baroclinic
wave embedded in a strong flow. The driving upper trough is very weak
initially, and does not start to develop until after 06z tomorrow. The
deepening of the surface low before that time is due to the tropospheric
thermal wave advecting beneath the strong upper flow towards lower contours.
500 hpa heights over the low centre are, in 12 hour steps starting at 1200
today, 540, 532, 526, 520, and 518.

--
Bernard Burton

Satellite images and weather data for Wokingham at:
www.woksat.info/wwp.html



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