The jet stream casts its shadow over the UK during October
October was an unsettled month, with frequent low-pressure systems influencing the weather of the UK, especially the south.
The above maps show the composite mean for the position of the jet stream during October 2019 (top) and October 2018 (bottom). Images provided by the NOAA-ESRL Physical Sciences Division, Boulder Colorado http://www.esrl.noaa.gov/psd/
The most notable influence on the month’s weather was the more southerly track of the jet stream when compared with an average October. This more southerly position brought more rain to southern parts and drier conditions to northern parts.
Although there were some calmer spells towards the end of the month, there were days with notable heavy rainfall, with over 100mm falling in 36 hours in the wettest parts of South Wales on the 25th and 26th.
Dr Mark McCarthy is the head of the Met Office’s National Climate Information Centre. He said: “The position of the jet stream has a major influence on the UK’s weather patterns, especially in autumn. This October, the jet took a more southerly track, steering low-pressure systems towards southern Britain, bringing heavy rainfall to some. By comparison the northern parts of the UK, especially northern Scotland and Northern Ireland, saw less rainfall, more sunshine, but they were also slightly colder on average, reflecting their position on the ‘cool’ side of the jet stream.”
The UK received 109% (138.8 mm) of its average October rainfall. Although it was wetter than average for the UK as a whole, the rainfall was not distributed evenly, with many northern regions and Northern Ireland receiving less than their average monthly totals.
Scotland and Northern Ireland were the only regions in the UK to record drier than average totals for October, with 87% (152.7 mm) and 84% (100.3 mm) respectively. Caithness was the driest historic county, with only 68% (80.9 mm) of its average October rainfall.
Rutland was the wettest compared to average with 177% (113.0 mm) of its monthly total. For the UK as a whole this marks the fifth consecutive wetter than average month.
Temperatures throughout the month were unremarkable, with the nationwide average 0.5°C below the 1981-2010 mean. Each region recorded slightly below average temperatures throughout the month. Only Kent and Sussex were above average in October, and that was only by 0.1°C.
|Provisional October 2019||Mean temp (°C)||Sunshine (hours)||Rainfall (mm)|
|Actual||Diff from avg (°C)||Actual||% of avg||Actual||% of avg|
Latest News from
Creating a five-year window into future climate09/07/2020 15:15:15
Providing annually-updated five-year climate predictions at global and continental scales is the focus of a new international science collaboration co-ordinated by the WMO and led by the UK’s Met Office.
Innovative space weather monitoring projects receive UKRI funding07/07/2020 10:15:00
UK Research and Innovation (UKRI) has announced funding for five projects focused on improving the UK’s capability to predict and mitigate the hazards of space weather.
EUMETSAT selects Phil Evans as its new Director General03/07/2020 08:15:00
We are very pleased to share the news that former Met Office Operations Director, Phil Evans, has been appointed as the new Director General of EUMETSAT.
End of June statistics02/07/2020 14:38:00
While June 2020 overall was not a record-breaking month, it has been notable for many, with some heavy rainfall at times.
Chances of 40°C days in the UK increasing01/07/2020 13:15:00
owards the end of the century parts of the UK could see 40°C days every 3-4 years on average under a high emissions scenario.
Hot and sunny with thunderstorms this week25/06/2020 15:15:15
It’ll stay hot and sunny with the risk of thunderstorms on Thursday and Friday, before fresher and cooler weather arrives through the weekend.
Met Office scientists receive prestigious Royal Meteorological Society Awards24/06/2020 15:15:15
Last month the Met Office Hadley Centre celebrated its 30th anniversary.
Global temperature: how does 2020 compare so far?24/06/2020 12:33:00
The Earth’s average temperature has increased by about 1 degree C since pre-industrial times, which for the climate record is calculated as the period 1850-1900.