Cloudbase & dewpoint
I remember from the PPL Met exam that you can work out an estimate of cloudbase from the temp/dewpoint split, at 400ft per deg Celsius. True to form, on Friday the ATIS gave 12/11 and the cloudbase was at 600ft.
But yesterday the ATIS was giving 10/9 and the cloud was few at 3500 overcast at 4200. The few at 3500 were Didcot power station gunk; but why was the cloudbase so much higher? QNH was 1031 i.e. v. high pressure.
Am I right in thinking it was because there was an inversion?
Tim