World weather review: April 2018

The global surface temperatures of April 2018 were close to 0.5 °C above average compared to the reference period of 1981-2010. Although Europe was still experiencing cold, wet and windy conditions in early April, the month averaged out to be the warmest European April on record. The anomaly map below shows the temperature difference of April compared to the reference period of 1981-2010, with it notably warm over central parts of Europe.

UK weather review: April 2018 theWeather Club Tue, 08/05/2018 - 17:16

April was warmer than average for most places of the UK. The month started with cold, wet and windy conditions continuing the weather pattern dominant in March. From mid-April, high pressure near the UK brought warm spells of air from the south. The hottest day in April since 1949 was recorded at St James's Park in London on 19 April reaching a maximum temperature of 29.1 °C. However, sunshine levels remained below average except in Scotland. From 22 April unsettled colder weather returned and temperatures dropped towards the end of the month again.

Unprecedented weakening of North Atlantic circulation

The warm, saline waters of the Gulf Stream meander northeasterly across the Atlantic Ocean, eventually forming the North Atlantic Current.  During winter, these salty waters cool and descend – it is this deep convection that is a key part of the Atlantic meridional overturning circulation (AMOC), the ocean conveyor belt. This conveyor belt is essential for heat exchange between the ocean and the atmosphere - it releases heat into the atmosphere above the North Atlantic Ocean then travels through the ocean, resurfacing in other areas of the world.

World weather review: March 2018

At the start of the month, the Beast from the East continued to cause heavy snowfall in Europe. The blizzard forced the cancellation of all flights at Dublin airport on Thursday and the temporary closure of Geneva airport in Switzerland. Large parts of the Continent continue to shiver in the grip of a Siberian weather system that has brought the coldest temperatures for several years.