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, but obviously dusk to dawn. (5) Higher values are possible in extreme situations. (6) Both instantaneous and integrated over previous hour output. (7) Over the preceding hour/three/six hours. (8) This is the falling snow amount in mm of liquid equivalent. Doesn’t reflect snow lying on the ground. Falling

-term Average (1981-2010) Monthly Rainfall Total (mm) 0900-0900 78.7 105.0 63.0 Total Days of Rain > 5mm 7 8 4 Monthly Snowfall Total (cm) 0.0 not available not available Total Days of Snow 0 1 0 Total Days with Snow Lying at 0900 0 0 0 Maximum Snow Depth (cm) at 0900 0.0 not available not available

models there are improvements to the treatment of lying snow, sub-grid turbulence and ice cloud fraction in mixed-phase clouds. The main goal of PS43 is to introduce the new En-4DEnVar scheme to the global ensemble. En-4DEnVar provides an ensemble of initial conditions which are generated through

week Low pressure is likely to lie in the vicinity of the UK into next week, bringing a mixture of showers, longer spells of rain, and some drier interludes. We are carefully monitoring the period of Tuesday to Thursday for the chance that an area of heavier rain moves up from the south

be composed of a very large number of ice crystals (predominantly starshaped) and the flakes may then have a diameter of several inches. UK England Wales Scotland Northern Ireland Month Days of snow Days of snow Days of snow Days of snow Days of snow Falling* Lying # Falling* Lying # Falling* Lying

Areas of expertise Atmospheric turbulence, especially boundary layer turbulence Dispersion of pollutants in the atmosphere Lagrangian models of dispersion Large-eddy simulation Publications by David Thomson Current activities David’s current activities lie in two main areas. The first involves

(Cumbria) of only -0.1 °C and Copley (Durham) reporting 9 cm of lying snow. The 5th started cold, with frost for many inland locations, then it was sunny for many, with just the odd isolated shower in the Midlands and the south-west. The 6th began with widespread frost, severe away from western areas

in the afternoon. It was generally cloudy on the 7th, feeling colder as an easterly wind set in, with wintry showers near north-eastern coasts, and a broad area of snow over East Anglia and the south-east, producing up to 10cm of lying snow in some places. Widespread frost on the 8th, with wintry showers

. Residents of Madrid saw the deepest snow accumulations in the city for over 50 years with 50-60 cm of snow lying in some parts. Relatively cloud-free conditions on January 11th allowed this image to be captured by the NASA/NOAA operated Suomi-NPP satellite, showing the extent of the snow cover over

, but often areas of high pressure bring clear skies which allow for some cold nights, frost and fog. On this occasion the centre of the high is expected to lie over Scandinavia with easterly winds on its southern flank bringing cold air from the continent into the UK. Keep up to date with weather