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cylchdroi yn yr awyr, rydyn ni’n galw hyn yn uwchgell neu fortecs. Mae hyn yn ffurfio cwmwl twndis a all, os yw’n cyrraedd y ddaear, ddod yn gorwynt. Mae’r gwyntoedd y tu mewn i gorwynt yn troelli’n gyflym iawn a gallant ddinistrio’r rhan fwyaf o’r hyn sydd yn eu llwybr. Gall hefyd fod yn eithaf brawychus

to estimate how much permafrost carbon would be released for a given level of global warming. This would require estimates of the amount and distribution of organic carbon stored in permafrost, and long-term monitoring of soil temperatures and carbon emissions. Currently, permafrost properties

are the prospects for early warning and what long-term observing systems need to be maintained? It is important to estimate how much permafrost carbon would be released for a given level of global warming. This would require estimates of the amount and distribution of organic carbon stored in permafrost

for Environment, Food and Rural Affairs (Defra), is a collaboration between the Met Office’s Vegetation-Climate Interactions team, Defra’s Plant Health Risk and Horizon Scanning team, the University of Exeter, Fera Science, the University of Warwick, Forest Research and The Royal Botanic Gardens, Kew

of the mixed conditions the country has had. What this January clearly demonstrates is just how abrupt these changes in weather type can be.” Gardeners will be glad of more subdued rainfall figures compared to the wet conditions of December, according to Royal Horticultural Society Chief Horticulturist Guy

in from the south on Monday morning, which could bring further snow to northern hills as it heads north during the day. With such a variety of weather over the next few days Guy Barter, Chief Horticulturist at the RHS, provides some advice on how to keep your garden in the best shape: "Gardeners dread

February in a series since 1910 (behind 1998), and included a new UK winter maximum temperature record (21.2 °C at Kew Gardens). March, April, July and December were all a degree or more warmer than average overall – and a new UK record of 38.7 °C was recorded at Cambridge Botanical Garden on July 25th

. Drawing on historical data from Kew Gardens and surrounding areas, here are some of the most extreme weather records associated with the Championships. Temperature extremes The hottest day recorded during the Wimbledon fortnight occurred on 1 July 2015, when temperatures soared to 35.7°C at Kew Gardens

on how to keep gardens in the best shape. Guy Barter, Chief Horticulturist at the RHS, said: “Gardeners dread spring frosts as these can nip the new flowers of fruit and other plants such as magnolias, but in many cases vulnerable flowers in the north will still be in bud, the growing season

) Previous wettest October day (mm) Date Record length Oxford 60.0 49.3 09/10/1875 165 Rothamsted (Hertfordshire) 59.8 55.2 12/10/1993 105 Balmoral (Aberdeenshire) 66.6 53.9 15/10/1976 105 Leuchars (Fife) 60.6 51.2 11/10/2012 98 Wellesbourne (Warwickshire) 48.6 47.4 15/10/2002 65 Benson (Oxfordshire) 43.6