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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

. The weather variables in a microclimate, such as temperature, rainfall, wind or humidity, may be subtly different to the conditions prevailing over the area as a whole and from those that might be reasonably expected under certain types of pressure or cloud cover. Indeed, it is the mixture of many

began frosty on the 17th, with fog in places, and some sunshine followed for all but the north-west. The 18th was broadly frosty to begin, with mist and fog covering the bulk of the country, clearing only slowly if at all in some spots; otherwise cloud amounts were variable with long sunny periods

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

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 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

of horizontal grid square occupied by cloud below 1,000 feet above sea level. m None None Hourly T+0 to T+132 3-hourly T+135 to T+198 Hourly T+0 to T+132 3-hourly T+135 to T+246 1 None None Hourly T+0 to T+132 Hourly T+0 to T+132 3-hourly T+135 3-hourly T+135 to T+198 to T+246

pressure, or depression, at the surface. There are various trigger mechanisms required to transform these cloud clusters into a tropical cyclone. These trigger mechanisms depend on several conditions being 'right' at the same time. The most influential factors are: a source of warm, moist air derived

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