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Volcanic Ash – T+0 annotated satellite image Issued 1200 UTC on Tue 09 May 2017 HIGH CONFIDENCE- Clear VA signal in IMO Mobile LIDAR HIGH CONFIDENCE- Clear VA signal in RGB Satellite image with limited amounts of meteorological cloud to obscure. HIGH CONFIDENCE- MOCCA report VA at FL200 across Wales. © Crown copyright Met Office

1900 UTC Jan 26 2016 annotated satellite image Issued 1915 UTC on Tuesday 26 Jan 2016 EXERCISE LOW CONFIDENCE- Pirep reports an area of ash to west of Katla but cloud cover in the area means we are unable to verify. HIGH CONFIDENCE- Ash plume clearly discernible in imagery extending northeast of Katla. EXERCISE EXERCISE © Crown copyright Met Office

Volcanic Ash – 1315 UTC annotated satellite image Issued 1330 UTC on Tue 13 Dec 2016 LOW CONFIDENCE- Eruption site and downwind plume obscured by thick meteorological cloud layers. Further, due to very bad weather conditions the data from the radar is not very clear. IMO estimate the plume height to still be around 12KM. © Crown copyright Met Office

Volcanic Ash – 1530 UTC annotated satellite image Issued 1600 UTC on Tue 10 Nov 2010 EXERCISE HIGH CONFIDENCE- Well defined ash in satellite imagery. LOW CONFIDENCE- PIREP report of VA at FL380. Position obscured by upper cloud HIGH CONFIDENCE- VA plume observed by mobile radar rising to FL590 EXERCISE EXERCISE © Crown copyright Met Office

Volcanic Ash – T+0 annotated satellite image Issued 1400 UTC on Tue 19 Nov 2013 EXERCISE KRAFLA eruption theoretical example HIGH VA visible on imagery MEDIUM VA partly obscured by high level cloud LOW VA reported from AIRREP at 1000UTC but little evidence on imagery and forecast trajectories show unlikely © Crown copyright Met Office

, where clouds form © Crown copyright 2013 5 is as much an expression of the dynamics of the system as the thermodynamics (e.g. Bony et al., 2004). There are varying degrees of confidence in the sign and size of the dominant feedbacks in the climate system, and the response of clouds remains

Volcanic Ash – T+0 annotated satellite image Issue 0730 UTC on Sun 17 Aug 2014 TEST TEST TEST HIGH CONFIDENCE TEST IMO radar reports VA FL300-FL370 LOW CONFIDENCE TEST PIREP of VA at FL280 but not discernable on imagery due to cloud obscuration HIGH CONFIDENCE TEST VA discernable on satellite imagery © Crown copyright Met Office

Volcanic Ash – 1030 UTC annotated satellite image Issued 1030 UTC on Tue 14 Mar 2017 LOW CONFIDENCE- Eruption site and plume obscured by dense layers of meteorological cloud. HIGH CONFIDENCE- IMO reports discernible volcanic ash from Katla at 08:30UTC. The plume has been seen from fixed radar rising to 18km +/- 0.8km. © Crown copyright Met Office

Volcanic Ash – T+0 annotated satellite image Issued 1030 UTC on Tue 09 Jan 2018 EXERCISE VOLCICE LOW CONFIDENCE- VA suggested by model winds and plume, however hard to discern due to cirrus cloud HIGH CONFIDENCE- VA observed by radar to 24km near source, moving NE at 70kt. Plume visible on imagery. EXERCISE VOLCICE © Crown copyright Met Office

development Convener: tbd An AI/ML approach to improve NWP products 14:20 Amar Jyothi NCMRWF using remote sensing data 14:40 Characterizing the causal impact of aerosols on cloud liquid water path adjustments from observations using machine learning. Daniel Grosvenor 15:00 Coffee Break + Poster Session 2