Explosive Cyclogenisis

Yesterday was a day of contrasts, weather wise. The barometric pressure dramatically dropped 29mb from 0800 to 2300, called an ‘Explosive Cyclogenisis’, (a fall of at least 24mb in 24 hours) or as in the press headlines – a ‘weather bomb’. An hour before midnight the pressure started to rise, the wind veered into the northwest and the air temperature, which had been rising steadily all day, fell very rapidly from 8c to 2C. Just before and after midnight the wind strength grew with several gusts to 35mph.
Over the course of a very wet day the accumulated rainfall measured 14.8mm, which is the wettest day this month. The rain ceased just before midnight and the strong wind, with reduced humidity, dried up the evidence of the considerable rainfall. The accumulated precipitation for December is now 60% of the 30-year average.