The pressure pulse can be seen on the Wokingham data, between 06 and 07z.
http://www.woksat.info/wwp6.html
Scroll down to see the page of graphs for the 26th


--
Bernard Burton
Wokingham, Berkshire, UK.

Satellite images at:
www.woksat.info/wwp.html
or
www.btinternet.com/~wokingham.weather/wwp.html
"Dick Lovett" wrote in message
...
0850Z W F3 9999 3CI250 7.1/5.6 Q1035=
09-09Z Tx 9.7 Tn 5.6 Tg 3.8 RR nil. RMK: COTRA. Unusual pressure
oscillations between 1033 and 1036 millibars in last 3 hours and
probably mountain wave induced.

Dick Lovett
Charlbury (Oxfordshire Cotswolds) 121m