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the criteria for issuing a change group in a TAF, and what this means in practice for the range of values that the forecast wind, visibility, cloud, and weather convey. Wind direction TAF change rule: a change of… What it means, in practice… 30 degrees or more in mean direction, the mean speed before or after

of rain, lets first understand how it forms in the first place. There has always been the same amount of water on the earth, but the amount floating around in the air as water vapour or clouds depends on how warm it is. Warmer air holds more water while colder air holds less. This is an important

biases in global coupled predictions • Building a new boundary layer scheme • Impact on predictions of stratocumulus clouds • Application of HSD to other problems Stratocumulus clouds from the Cloud Appreciation Society. Hierarchical System Development The HSD workflow follows steps: 1. Identify

Yoko works to quantify and reduce uncertainty in climate change, through understanding and improving the representation of cloud-radiative processes.

Areas of expertise Clouds, radiation budget, and feedbacks in satellite observations, GCMs, and cloud resolving models Development of metrics to assess GCM cloud radiative fields and feedbacks Radiative feedback in the seasonal cycle Modelling of cloud radiative effects Current activities Cloud

) • Wool jumper • Dark room • Internet Making lightning | DIY Activity Activity Steps 01 What is lightning and what causes it? Lightning is a huge electrical discharge that flows between clouds, from a cloud to air, or from a cloud to the ground. As many water droplets form inside a storm cloud

Kalli works on cloud microphysics, with a particular interest in mixed-phase and ice clouds.

Areas of expertise Cloud microphysics High resolution modelling Current activities Kalli works in the cloud scale modelling group that is part of Atmospheric Processes and Parametrizations. The cloud scale modelling group focuses on process studies of cloud microphysics. This work is used

Paul leads research into cloud microphysical processes.

Areas of expertise Microphysics modelling Cloud physics observations Publications by Paul Field Current activities Paul manages the cloud scale modelling group that is part of Atmospheric Processes and Parametrizations. The cloud scale modelling group focuses on process studies of cloud

November due to the ongoing unsettled weather, with groundwater flooding an issue in parts of Dorset, and many rivers having burst their banks. Storm Debi on 13th brought the strongest winds to coastal areas of Northern Ireland and north-west England. A number of roads in Northern Ireland were blocked

Mark chairs the Cloud Feedback Model Intercomparison Project (CFMIP) and works on understanding cloud feedbacks in climate models and evaluating model clouds with observations.

Areas of expertise Radiative forcing and feedback analysis. Evaluating cloud processes using satellite simulators. The tropospheric energy budget and the global hydrological cycle. The design of model intercomparison studies. Current activities Mark has been the lead co-ordinator of CFMIP since

Wednesday morning will begin with locally heavy rain moving southeast across parts of England and Wales, accompanied by an area of showers pushing southeast. By mid-morning, the rain will clear the far southeast, leaving behind variable cloud cover and scattered showers. Temperatures will be around