Issued: 1000hrs Saturday 13th January 2018
Duty forecaster: Garry Nicholson
Risk of gales
It will be an unsettled week ahead, with cold westerly winds originating from Greenland. Heavy snow and hail showers will be frequent in the west. During midweek, a more organised area of snow is possible, but probably rain in the south. Blustery winds, and possible gales around Thursday.
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Low pressure centred north of Britain and high pressure around the Azores produces a strong westerly wind. Widespread and frequent heavy showers, merging to constant precipitation in all western regions - snow or hail falling to low levels, accumulating over the hills. Possible thunder, especially near western coasts. A risk of ice. Brighter toward the east, with sunny intervals. Temperatures 2 to 5C, but feeling sub-zero in the wind.
A similar pattern, with an unstable westerly airstream producing heavy and squally showers - of snow or hail again to low levels. Eastern regions will stay driest, with spells of sunshine. Staying windy, and feeling cold. Later, a frontal system may move into Ireland, then western Britain, bringing a risk of persistent rain, or snow over high ground. Highs 2 to 5C.
Confidence is low, but an active area of low pressure may pass quickly eastwards across the British Isles. A risk of gales, especially in the south & west. A period of rain in the south, but a threat of disruptive snow across northern and perhaps central regions. Temperatures ranging from close to freezing in the north, up to 8C in the south.
A chilly west to northwesterly pattern is likely, bringing further wintry showers, most frequent around western coasts, but advancing well inland, giving snow and hail to low levels. Sunny spells toward central and eastern areas. Highs 1 to 5C.
The wind is likely to turn northerly, maintaining cold conditions. Snow and hail showers focused around coasts in the east, west & north, whilst central and southern districts should stay dry with winter sunshine. Highs 0 to 5C.
Staying cold, with snow showers probably confined to North Sea coasts, although a few may continue locally around the Irish Sea. Sunshine for many areas. Frost and ice overnight. Highs 0 to 4C.