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sometimes bring hot, thundery weather. Easterly winds in winter bring very cold air to the British Isles. The characteristics and path of the air determine whether it is cloudy (with perhaps rain, sleet or snow) or fine and sunny. In summer, an easterly wind will mean it is cool on the east coast but warm

. The monthly averages of days with sleet/snow falling and lying at Stornoway and Aviemore are shown below (a day of lying snow is counted if the ground is more than 50% covered at 0900). Heavy snowfalls can cause travel and power supply disruption. Examples include 28-29 January 1978 when strong NE winds

sometimes bring hot, thundery weather. Easterly winds in winter bring very cold air to the British Isles. The characteristics and path of the air determine whether it is cloudy (with perhaps rain, sleet or snow) or fine and sunny. In summer, an easterly wind will mean it is cool on the east coast

(with perhaps rain, sleet or snow) or fine and sunny. In summer, an easterly wind will mean it is cool on the east coast but warm elsewhere, usually with clear skies. Warm, cold and occluded fronts The boundary between two different types of air mass is called a front. In our latitudes a front usually separates

Tymheredd dyddiol isaf: 10 °C Tebygrwydd o law: 60% Cyflymder gwynt ar gyfartaledd: 13 mph Cyflymder hyrddau: 32 mya Rain showers turning into sleet in the afternoon Tymheredd dyddiol uchaf: 5 °C Tymheredd dyddiol isaf: 2 °C Chance of precipitation: 80% Cyflymder gwynt ar gyfartaledd: 9 mya Cyflymder

Storm Arwen is clearing the UK with winds gradually easing though further areas of rain, sleet and at times snow will affect the country.

with snow lying has a similar distribution, with less than 5 in the islands and along the coast but over 30 days over the higher ground. These averages can be compared with the coasts of SW England where less than 3 days per year with lying snow. The monthly averages of days with sleet/snow falling

with snow lying has a similar distribution, with less than 5 in the islands and along the coast but over 30 days over the higher ground. These averages can be compared with the coasts of SW England where less than 3 days per year with lying snow. The monthly averages of days with sleet/snow falling

, the Lecht (Grampian) and Glenshee (near Braemar). The monthly averages of days with sleet/snow falling and lying at Dyce and Balmoral are shown below (a day of lying snow is counted if the ground is more than 50% covered at 0900). Heavy snowfalls can cause transport disruption. For example, a very

with sleet/snow falling and lying at Leeming and Whitby are shown below (a day of lying snow is counted if the ground is more than 50 % covered at 0900). The depth of undri ed snow does not o en exceed 15 cm at low altitudes but on occasions depths of 30 to 60 cm may occur over a wide area. When depths