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2200 UTC Jan 26 2016 annotated satellite image Issued 2330 UTC on Tuesday 26 Jan 2016 EXERCISE LOW CONFIDENCE- Extensive meteorological cloud covering most of Iceland making verification of plume difficult. EXERCISE EXERCISE © Crown copyright Met Office

Volcanic Ash – T+0 annotated satellite image Issued 1000 UTC on Tue 11 Mar 2014 EXERCISE HIGH Thick upper cloud covering ash plume LOW Spurious aircraft report off ash. No ash visible. © Crown copyright Met Office

Volcanic Ash – T+0 annotated satellite image Issued 1530 UTC on Tue 10 October 2017 EXERCISE VOLCICE HIGH CONFIDENCE- VA measured by IMO ground based radar to 18km. Plume largely masked by meteorological cloud at present. © Crown copyright Met Office

Volcanic Ash – 1530 UTC annotated satellite image Issued 1550 UTC on Tue 14 Feb 2017 HIGH CONFIDENCE- Eruption site and downwind plume obscured by high cloud, however IMO ground observations from RADAR report ash plume at 18KM © Crown copyright Met Office

Volcanic Ash – 1500 UTC annotated satellite image Issued 1530 UTC on Tue 11 Apr 2017 LOW CONFIDENCE Ash plume is not clearly discernible around Grimsvotn due to cloud obstruction, but IMO ground based radar observations report ash plume to 15km. © Crown copyright Met Office

Volcanic Ash – T+0 annotated satellite image Issued 1300 UTC on Tue 11 Mar 2014 Large area of thick upper cloud currently covering any visible ash. MEDIUM LOW Airep report of ash at FL330. No visible ash on sat pic © Crown copyright Met Office

Volcanic Ash – 1545 UTC annotated satellite image Issued 1700 UTC on Friday 12 April 2019 HIGH CONFIDENCE- Clear VA signal 12/1531UTC to FL720 in mobile LIDAR HIGH CONFIDENCE Ash discernible on satellite imagery due to low level meteorological cloud © Crown copyright Met Office

Volcanic Ash – T+0 annotated satellite image Issued 1600 UTC on Tue 18 Jul 2017 LOW CONFIDENCE- Areas of overcast meteorological broken cloud northeast of Iceland is preventing identification of discernible ash. HIGH CONFIDENCE- Clear VA signal in near volcanic source © 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

1000 UTC Jan 27 2016 annotated satellite image Issued 1000 UTC on Wednesday 27 Jan 2016 EXERCISE HIGH CONFIDENCE- VA clearly discernible from satellite imagery, despite cloud cover increasing from the west. Verified by IMO radar at source. EXERCISE EXERCISE © Crown copyright Met Office