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in marginal situations.  For example, they help determine whether precipitation will fall as rain, snow, or sleet, or whether fog is likely to form. By comparing current conditions with these equations, meteorologists can quickly assess whether the model output is realistic and make adjustments

widespread, blustery, and locally heavy, with isolated hail and thunder, only the north-east avoiding the worst of them. Eastern fringes were mainly bright or sunny on the 12th, with frequent, locally heavy, blustery showers, giving sleet, snow, hail and the occasional thunderstorm, and 3 cm of snow

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

. 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

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

, 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 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 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

Highlands, which have about 60 days with snow lying on average and with the coasts of SW England, with less than 3 days per year. In most places, January is the month with most days of both snow lying and snow falling closely followed by February. The monthly averages of days with sleet/snow falling

. The monthly averages of days with sleet/snow falling and lying at Waddington and Marham are shown below (a day of lying snow is counted if the ground is more than 50 % covered at 0900). One of the worst winters was that of 1947 when snow fell somewhere in the UK every day between 22 January and 17 March