In article ,
Graham P Davis writes:
John Hall wrote:

That -19mbar anomaly seems remarkably large. Does it represent any sort
of a record?

January and February 1963 both had anomalies of a little more than +30 over
Iceland.

Phew, that's impressive! Thanks, Graham.
--
John Hall Weep not for little Leonie
Abducted by a French Marquis!
Though loss of honour was a wrench
Just think how it's improved her French. Harry Graham (1874-1936)