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will start markedly different from the end of the working week, with widespread cloud cover and outbreaks of rain, particularly affecting western areas. Rain will be persistent across western Scotland, especially over the hills, following an already wet Friday. With schools breaking up and holiday

of Convective Snow (kg/m**2/s) Surface Low-Level Cloud Amount (%) Surface Medium-Level Cloud Amount (%) Surface High-Level Cloud Amount (%) Surface Fog Fraction (%) Surface Mean Sea Level Pressure (hPa) Surface Temperature at 1.5m (DegK) Surface 10m Wind-U (m/s) Surface 10m Wind-V(m/s) 850 hPa Temperature (DegK

WAFS 10 YEAR PLAN PHASE 1 PHASE 2 In Nov 2020: NEW 0.25° Icing, Turbulence and CB gridded data NEW Improved Icing and Turbulence algorithms NEW OPMET data in IWXXM format Retired: In-cloud turbulence gridded data In Nov 2022: All SIGWX will cover the range FL100-FL600 Some SIGWX elements included

14.5 °C, with fog in some central and southern counties, the 11th was mainly dry with just patchy light rain for the north, and it brightened up across the south-east during the afternoon. The 12th was rather cloudy, but the cloud tended to thin and break from most parts away from western coastal

radar Europe area satellite imagery UK High resolution forecast map layers - Precipitation type, Visibility, Total cloud, Cloud layers, Fog Produced by the Met Office. Met Office and the Met Office logo are registered trademarks. © Crown Copyright 2024, Met Office 02765

CONFIDENCE- Pilot report of ash at FL380 here at 13/1430Z. Not supported model output and not discernible on satellite imagery due to frontal (meteorological) cloud. Seems unlikely at that height also. LOW CONFIDENCE- Low confidence in ash in this ellipse due to obscuration by meteorological cloud. Ash suggested by model output only in this region. © Crown copyright Met Office

  The representation of fog, cloud and rain processes in regional modelling is of fundamental importance for both NWP and climate, particularly at “convective” resolving scales. This session will include talks and discussion covering; fog and visibility,  microphysics (both cloud and aerosol), aerosol-cloud

in satellite imagery extending northeast from Katla, although now partially obscured by upper cloud layers. This position verifies well with model forecasts. Earlier Airep report of Ash cloud considered to be unlikely given upper wind trajectories, available imagery, and forecast model Ash plume data. © Crown copyright Met Office

of clouds, exponentially distributed in size. First population always present: L = 160m Second population depends on organisation: L = 760m Convection Working Group Humphrey Lean Kirsty Hanley Km and sub-km scale UM over Southern UK 1500m 500m 200m 100m www.metoffice.gov.uk © Crown Copyright 2017, Met

1300 UTC Jan 27 2016 annotated satellite image Issued 1350 UTC on Wednesday 27 Jan 2016 LOW CONFIDENCE- Ash may extend further west in Denmark Strait but cloud cover means it cannot be discerned by satellite imagery. EXERCISE HIGH CONFIDENCE- VA clearly discernible in satellite imagery. Verified