Thursday, September 3, 2015
TODAY: Cool, cloudy though mostly dry. Strong winds.
TONIGHT: Rather cloudy. Winds easing. Rain later.
TOMORROW: Dull, misty morning with rain. Dry and bright by afternoon, but windy again. . Mainly dry overnight. Windy.
DAYS 3-5. A rather cloudy weekend with patchy rain. Winds easing. Mainly dry and bright by Monday.
DAYS 6-10: Settled conditions perhaps lasting through much of the week. Possibly becoming unsettled and windy later.
Rather cloudy though mainly dry today with a strong N’ly wind, this easing fresh, occasionally strong, in the afternoon. Dry for much of tonight with winds continuing to ease. Cloud will thicken, bringing outbreaks of rain by dawn.
Friday morning rather dull and misty with outbreaks of rain. Drier, brighter conditions with a few showers will follow for the afternoon with moderate SW to W’ly winds becoming strong NW’ly. Mainly dry overnight with clear spells and a fresh to strong NW’ly wind.
Saturday cool with a fresh to strong NW’ly wind. Rather cloudy but dry at first with outbreaks of rain later. Cloudy on Sunday with patchy rain. Milder with a fresh but easing NW’ly wind.
Much of next week fair with moderate W’ly winds falling light. Becoming unsettled later with S to SE’ly winds increasing strong.
GENERAL SITUATION AND SYNOPSIS 06:00 UTC
With pressure high to the west and a depression over southern Scandinavia a strong N’ly airflow covers northeast Scotland. This will persist through today, but temporarily ease on Friday as a frontal system slips south across the Northern Isles.
A ridge will approach from the west during the weekend with a weak front, slipping round the edge of the high, affecting Orkney and Shetland later on Saturday and on Sunday. At the same time the fresh NW’ly airflow will gradually ease.
After the weekend the airflow will slacken as a ridge moves east. High pressure, forecast to move east over Scotland may well bring settled conditions for much of next week. Current predictions suggest a strengthening S to SE’ly airflow later as Atlantic low pressure drives fronts east over Scotland.
FORECAST FOR NEXT THREE DAYS
Daytime temperatures 13° or 14° Celsius for Orkney. Overnight lows 9° or 10° Celsius.
THURSDAY 3rd: Rather cloudy and mainly dry with the chance of a little brightness at times. It will be mainly dry for much of tonight with variable amounts of cloud. N’ly winds will continue to ease, veering F4-5 NE’ly. However cloud will thicken later, bringing outbreaks of rain eastwards by dawn.
Sea State: Moderate to rough, with a 2 to 3 metre N’ly wind-swell later.
FRIDAY 4th: The morning rather dull and misty with extensive low cloud and outbreaks of rain. Drier, brighter conditions will begin to edge in from the northwest by early afternoon. F4 SW to W’ly winds will veer NW’ly with the clearance and increase F5-6. A bright, breezy end to the day with a few showers. Mainly dry overnight with clear spells and a F5 NW’ly wind.
Sea State: Mostly moderate, with a 2 metre NW’ly wind-swell.
SATURDAY 5th: Cool with a F5-6 NW’ly wind. Rather cloudy but dry at first with outbreaks of rain later.
Sea State: Moderate to rough, with a 2 to 3 metre N to NW’ly wind-swell.
Temperatures 13° to 15° Celsius by day. Overnight lows down to around 9° Celsius.
SUNDAY 6th: Cloudy with patchy rain. Milder with a fresh but easing NW’ly wind.
Sea State: Perhaps mostly moderate becoming slight to moderate, with a 2 metre NW to N’ly wind swell easing 1 to 2 metre NW’ly.
MONDAY 7th: Mostly dry and bright with moderate NW’ly winds.
Sea State: Possibly slight to moderate, with a 1 to 2 metre NW’ly wind-swell.
TUESDAY 8th – SUNDAY 13th: Much of the week probably fair with light winds. Perhaps becoming unsettled later with S to SE’ly winds increasing strong.
Sea State Tuesday: Possibly slight, with a 1 metre W’ly wind-swell.