On Fri, 11 Sep 2009 15:35:06 +0100, Martin Rowley wrote in


Looking at recent obs it may well be the AWS at Ballykelly is
slightly over
reading. Eglinton at 13.50z was 1038mb rounded, whilst Ballykelly
was
still 1040mb at 13z. At 14z Ballykelly was 1039 and at 14.20
Eglinton was
1038. They are less than 10 miles apart.

... thanks Mike. As you point out, looks a bit high. Perhaps the
'honour' will go across the border then (to Malin Head/1041.3 mbar at
00Z), but as I said, Stephen will even now be delving away with charts
and tables (or something fancier) and will no doubt come up with the
definitive answer :-)

I wonder just how accurate the AWS system is and how often the sensors are
calibrated. Eglinton is an airfield still (City of Derry Aiport) so guess
pressure has to be accurate. Ballykelly, on the other hand, is the now a
disused army camp (Shackleton Barracks) where my wife used to "work":-) It
closed in the spring of 2008.

At least if the record does go to Malin we know the figure is as accurate
as can be, as it is still a manned station. Long may that continue, but
with the Irish economy being in ruins that may not last long - cue JCW:-)

--
Mike Tullett - Coleraine 55.13°N 6.69°W posted 9/11/2009 2:44:46 PM GMT