2019 ended with a final month of excessive rainfall which resulted in another flood event on 21.12.19 bringing the total for the year to five. An analysis of the years rainfall data at local gauging stations in Daventry, Dodford, Towcester, Pitsford and Nether Heyford showed many similar trends, namely Jan-May below average whilst every month from June to December significantly exceeded the monthly averages. In particular June and October witnessed twice their monthly averages and although there were local variations, Nether Heyford recorded the highest yearly level of 826 mm, ie.18.8% above average. In spite of this Northamptonshire remains one of the lowest rainfall Counties in the Country, possibly due to its central location and surrounding elevated terrain.
These seasonal and now annual variations in weather patterns can clearly be attributed to the erratic behaviour of the jet stream and the effect of global warming. The warming in the polar regions have effected both the northern and southern hemisphere jet streams which coupled with increased El Nino activity have contributed to extreme variations across the UK. 2019 saw record July temperature of 38.7 degrees centigrade in Cambridge whilst Scotland recorded 18.7 degrees centigrade in December. Further evidence of global warming was seen in extreme levels of flooding, forest and bush fires, hurricanes and volcanic activity.
Already January 2020 has started with moderately warm weather interrupted by cold winds from storm Brendon and local flooding on 15.1.20 due to moderate rainfall on 14.1.20 falling on an already saturated catchment area. However the longer term forecast for the remainder of January is generally dry and sunny with overnight frosts. Day time temperatures will be nearer to the January average.
In spite of this let’s hope the World’s 2020 weather settles down!
PS: My thanks to Tony Clewett for Nether Heyford rainfall data.