Friday, November 21, 2014
TODAY: Mostly dry with bright. Freshening winds.
TONIGHT: Rain spreading northeast. Windy.
TOMORROW: Shetland remaining wet and windy. Rain clearing Orkney later.
DAYS 3-5: Becoming cooler, drier, brighter and less windy.
DAYS 6-10:Perhaps dry and bright but winds gradually strengthening again.
Bright today with some showers, these more likely across Orkney, while Shetland sees the best of the sunshine. SE’ly winds freshening across Shetland and becoming strong over Orkney later. Mainly dry with some clear spells at first tonight then clouding over with rain reaching Orkney during the early hours and Shetland later. Strong SE’ly winds.
Saturday starting wet with strong to gale-force SE’ly winds. Orkney turning drier later as winds veer fresh to strong S to SW’ly. Shetland staying wet and windy. The rain clearing Shetland during Sunday morning. Then a cooler day with sunny spells and showers with strong SW to W’ly winds.
Monday starting cloudy with showers but becoming drier and brighter as fresh to strong W’ly winds ease. Tuesday mainly dry and bright with lighter S to SW’ly winds. Much of the week perhaps mostly dry and bright but with SE’ly winds steadily increasing strong at times.
GENERAL SITUATION AND SYNOPSIS 06:00 UTC
A developing low will move towards Iceland today, strengthening the SE’ly airflow as it comes up against high pressure to the north east.
With the depression south of Iceland the strong SE’ly airflow will veer SW’ly on Saturday as associated occluding fronts swing east over the Northern Isles. As the low moves east a cooler and showery W’ly airflow is likely on Sunday and at first on Monday. The low will then fill, with a ridge forecast to move east over Scotland.
A lighter S’ly airflow may then strengthen SE’ly during the week as further Atlantic low pressure tries to move towards the British Isles but is prevented by high pressure
FORECAST FOR NEXT THREE DAYS
Temperatures rising to 10° Celsius by day, with overnight lows of around 7° Celsius.
FRIDAY 21st: Bright with sunny spells and some showers, these more likely across Orkney, while Shetland sees the best of the sunshine. SE’ly winds freshening F5 across Shetland and becoming a strong F6 over Orkney later. Mainly dry with some clear spells during the evening, then clouding over with rain reaching Orkney during the early hours and Shetland later in the night. Strong SE’ly winds.
Sea State: Slight to moderate at first becoming moderate to rough, with a 1 to 2 metre S to SE’ly wind-swell building 2 to 3 metres.
SATURDAY 22nd:Starting wet with F6 to gale F8 SE’ly winds. Orkney turning drier and clearer later as winds veer fresh to strong S to SW’ly. The rain and strong to gale SE’ly winds persisting across Shetland.
Sea State: Rough, with a 3 to 4 metre SE’ly wind-swell.
SUNDAY 23rd:The rain clearing Shetland during the morning. Then a cooler day with sunny spells and showers with F6 SW to W’ly winds.
Sea State: Rough to very rough in the west, with a 3 to 5 metre SW or W’ly wind-swell. In the east moderate to rough, with a 2 to 3 metre SW or W’ly wind-swell.
Daytime temperatures rising to around 10° Celsius. Overnight lows falling to about 6° Celsius. A degree or so milder later.
MONDAY 24th:Starting cloudy with showers or patchy rain. Becoming drier as fresh to strong W’ly winds ease.
Sea State: Moderate, with a 2 metre SW’ly wind-swell.
TUESDAY 25th:Mainly dry and bright with lighter S to SW’ly winds.
Sea State: Perhaps rough in the west, with a 3 metre SW’ly wind-swell. In the east slight to moderate, with a 1 to 2 metre SW’ly wind-swell.
WEDNESDAY 26th – MONDAY 1st:The week perhaps rather cloudy with some showers. Freshening SE’ly winds increasing strong. Possibly becoming wet and windy over the weekend with risk of gales.
Sea State Wednesday: Possibly moderate to rough, with a 2 to 3 metre S to SE’ly wind-swell.