December started anticyclonic and the flow became very meridional till the 16th, before things dramatically changed. and for the rest of the month the circulation was predominately zonal west or southwesterly. There was at least one named storm possibility during December on the 19th, but this was summarily dismissed by the UKMOUKMO The Meteorological Office is the United Kingdom's national weather service. It is an executive agency and trading fund of the Department for Business, Energy and Industrial Strategy. The analysis showed that December had been 24% cyclonic and 9% anticyclonic, with S-SW-W 33% and N-NENE North East-E flow 26% of the time.