WEEK 2 Wednesday 8th December –Tuesday 13th December 2010
ISSUED Sat 4th Dec 1300BST
POTENTIALLY SEVERE WEATHER OVER THE PERIOD-moderate risk of some moderate snow in places more especially in the north and north east, moderate risk of severe frosts in the north and central areas in particular until Friday
WEEKLY SUMMARY DECEMBER WEEK 2
Another cold or very cold week but mainly dry for most as high pressure dominates. Temperatures staying well below average with the nights very cold and frosty with some freezing fog about too. Further unusually low temperatures are possible inland through the week. Snow showers affecting the far north and north east coasts at times. Rather less cold weather may move down from the north by the weekend but staying mainly dry. Becoming colder again as we go into the following week.
Wednesday 8th looks likely to see the cold N’ly flow continue over northern parts as low pressure moves down the north sea giving a cloudy night across many north eastern areas with some wintry showers about or possibly longer spells of sleet & snow in places esp near coasts and over hills but drier elsewhere with a widespread moderate to severe frost and icy patches inland. Temperatures as low as -9 to -11C in the north & Midlands, more like -5C further south inland. Some freezing fog and low cloud about here too with icy patches slow to clear if at all. Generally a dry day with some sunny periods where the cloud clears away from the north east and down the east coasts where wintry showers continue. There’s a moderate risk of some more lying snow in the north east, a few cm in places. Soon frosty again by evening. Maximum temperatures reaching about -1 to 1C generally but maybe 4C in the SW and on exposed coasts but only -5 to -3C over parts of inland Scotland, esp the Highlands and central and northern high ground.
Thursday 9th looks set to see a more N’ly flow dominate for most with high pressure to the NW and low in the North Sea so it seems after a very cold start inland with a moderate locally severe frost quite widely away from the cloudier NE and east coasts and icy patches about most parts will see a few sunny periods. Inland Scotland seeing a severe frost given the increased wind chill factor with temps as low as -7C in the glens. Staying partly cloudy night and day in most northern , north western and eastern coastal areas with wintry showers about with localised accumulations of 2-7cm but there will likely be brighter weather at times too for some though persistent mist may linger inland across western and southern England and Wales. Another moderate or severe frost with some localised freezing fog and mist patches developing inland by mid evening in the south and west where skies are clear enough. Maximum temperatures a very cold -4 to 0C generally though may be 2-3C in the more sheltered south and south west but more like -6C in the Highland glens.
Friday 10th seems likely to start very cold and frosty inland with a ridge of high pressure pushing back into the south and west but in the NWly flow a few more wintry showers on the north coasts overnight. Most areas staying dry by day but some freezing fog, ice crystals & snow grains about at times elsewhere . A moderate frost again setting into many areas inland away from the north and east coasts though by evening with further low cloud, freezing fog and mist patches developing. Temperatures reaching 1-4C in the south west and far south today and on east coasts but generally a very cold day- more like-3 to 0C in other areas and only -5C over Highland and N Scotland.
Saturday 11th and Sunday 12th are more uncertain in terms of specifics but probably likely to see milder weather push down across the north and west especially for a time as high pressure in the north retreats west. By Sunday this milder NWly flow strengthening a little more . Saturday then likely to see a cold start restricted to the SE away from coasts, temperature -4C in places inland on snow fields but generally will be 0-3C elsewhere with a lot of fog, low cloud, sleety rain and drizzle about. On Sunday more cloud and light rain or sleety outbreaks seem likely to affect many areas esp the north and east during the day with the west and south perhaps seeing the best of any brightness but a lot of fog mizzle and low cloud persisting Temperatures over the weekend by day in the north, central areas, the east and SE will likely be relatively milder at about 2 to 4C but more like 7-10C in the south west
Monday 13th and Tuesday 14th: Probably becoming colder again from the north by later Monday in a mainly N’ly flow with wintry showers moving into the north by Monday and then extending south into some other parts later mainly near coasts. Some accumulations on high ground and near NE coasts of 5-10cm are likely. Drier inland with moderate frost again by night and mist patches with icy roads. Temperatures about 2-5C in the south and 1-2C in the north.
FORECAST CONFIDENCE is moderate-high for the patterning & detail, but only moderate for detail from about Friday onwards
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