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occupied by cloud as diagnosed by the model cloud scheme. This is for the whole atmosphere column as seen from the surface or the top of the atmosphere. Fraction of horizontal grid square occupied by cloud in the high-level cloud height range; from 5,574m (~18,000ft) to 13,608m (~44,500ft). A fraction

rainfall_rate_from_ convection_max- PT01H rainfall_rate_from_ convection_max- PT03H rainfall_rate_from_ convection_max- PT06H rainfall_ accumulation-PT01H Fraction of horizontal grid square occupied by cloud as diagnosed by the model cloud scheme. This is for the whole atmosphere column as seen from

Volcanic Ash – T+0 annotated satellite image Issued 1500 UTC on Tue 05 Aug 2014 TEST TEST TEST TEST TEST TEST MEDIUM CONFIDENCE - Thick cloud obscuring any ash layers BUT – VA was discernable in this location on earlier images HIGH CONFIDENCE- IMO radar discerning VA to FL360 near Katla and VA

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

A mix of weather across the UK, with variable cloud cover and mostly dry conditions for many.

Tuesday brings a mix of weather across the UK, with variable cloud cover and mostly dry conditions for many. Inland areas, particularly across the west and centre of the country, can expect clear or sunny spells, making for a bright but brisk day. However, windward coasts, especially those facing

Friday morning will begin with freezing fog patches, particularly across southeast England. These are expected to lift by mid-morning, giving way to a more organised area of cloud and rain in the northeast. This rain will gradually become more showery as it clears into the Northern Isles. Elsewhere

to 22°C. These warmer conditions will be driven by the arrival of a warm sector airmass. Thursday night will bring increasing cloud cover, with low cloud and drizzle expected over western hills. More persistent rain will return to northern and northwestern regions, accompanied by strengthening winds

A combination of rain, showers, strong winds, and lower-than-average temperatures will be the main features as we move from Friday into Saturday. Friday will see cloud and rain, at times heavy, affecting eastern Scotland and north-east England. Elsewhere, the weather will be a mix of sunshine

clouds. Going from a global climate model with dx=100 km to dx=1km would lead to needing 100^3=1,000,000 more compute. If we can get some of the benefit for less than that, that is a massive WIN! So not faster as such, perhaps slower even, but faster than what an increase in resolution would cost! 80

breaks in the cloud may develop in the lee of hills. It will feel notably humid across England and Wales, with temperatures rising higher than on Friday. The southeast is expected to be particularly warm, with maximum temperatures reaching 29 to 30°C. A breezy day for many, especially in the far