Thursday, October 1, 2015
TODAY: Mainly dry, cloudy and breezy.
TONIGHT: Cloudy with patchy rain. Windy.
TOMORROW: Orkney cloudy with some rain. Shetland becoming drier and brighter. Strong winds easing.
DAYS 3-5. Chance of a few showers on Saturday. Mainly dry on Sunday. Winds falling light. Dry on Monday but becoming windy.
DAYS 6-10: Changeable and unsettled. Windy at times with risk of gales.
Mainly dry today but rather cloudy, with some mist and drizzle patches at times, mainly in Shetland. Some brighter spells, especially across Orkney. Fresh W to SW’ly winds increasing strong. A cloudy night with some patchy light rain or drizzle. Windy with strong SW’ly winds.
A cloudy damp start to Friday, with little improvement for Orkney, with some light rain in the afternoon. After a cloudy start Shetland becoming dry and bright by the afternoon. Fresh to strong W’ly winds over Shetland, moderate to fresh across Orkney. A cloudy night generally with a little rain and fresh SW’ly winds.
Rather cloudy over the weekend with the chance of a few showers but also some dry spells. Moderate SW’ly winds backing S’ly. Mainly dry and bright on Monday, S to SE’ly winds increasing strong. Becoming wet and windy with rain later Tuesday. The rest of the week changeable and unsettled at times. Often windy with mainly S to SW’ly winds and chance of gales.
GENERAL SITUATION AND SYNOPSIS 06:00 UTC
The north of Scotland lies in the mild, moist SW to W’ly airflow on the northern edge of a ridge extending westwards from an anticyclone centred over the North Sea. Weak trailing fronts will never be far from the Northern Isles.
As pressure weakens a little and a depression moves east over the northern Norwegian Sea the SW to W’ly airflow will strengthen today as a cold fronts edges south towards the Northern Isles. This should clear Shetland Friday afternoon.
Pressure is forecast to remain high across the UK until after the weekend when it is expected to migrate eastwards. Current predictions indicate a more unsettled and changeable Atlantic SW’ly regime to predominate next week.
FORECAST FOR NEXT THREE DAYS
Daytime temperatures around 13° Celsius for Orkney and 12° or 13° Celsius for Shetland. Overnight lows 8° or 9° Celsius.
THURSDAY 1st: Mainly dry but rather cloudy, this low at times across the hills and thick enough to give some drizzle, mainly in Shetland. However the cloud will occasionally break to give brighter spells and some sunshine, especially across Orkney. F5 W to SW’ly winds increasing F6. Perhaps some early evening brightness across Orkney otherwise cloudy with some patchy light rain or drizzle overnight. Windy with F6 SW’ly winds.
Sea State: Slight to moderate becoming moderate to rough, with a 1 to 2 metre W’ly wind-swell increasing 2 to 3 meters. Highest in the west.
FRIDAY 2nd: A cloudy damp start and Orkney seeing little improvement through the day, with some patchy light rain in the afternoon. A similar start across Shetland but becoming dry by midday as brighter conditions spread in from the northwest with some afternoon sunshine. F5-6 W’ly winds over Shetland, F4-5 across Orkney. A cloudy night generally with a little rain and F5 SW’ly winds.
Sea State: Moderate to rough, with a 2 to 4 metre W’ly wind-swell. Highest in the west.
SATURDAY 3rd: Mostly cloudy with some showers. F5 SW’ly winds easing to a F4 SW to S’ly.
Sea State: Becoming mostly moderate, with 2 metre W to SW’ly wind-swell.
Temperatures 13° or 14° Celsius by day. Overnight lows down to 9° or 10° Celsius.
SUNDAY 4th: Mostly dry and perhaps brighter, though still rather cloudy at times. Moderate or light S’ly winds.
Sea State: Slight to moderate, with a 1 to 2 metre SW’ly wind-swell.
MONDAY 5th: Mainly dry and bright, S to SE’ly winds increasing strong. Perhaps some rain overnight.
Sea State: Perhaps mostly moderate, with a 2 metre S to SE’ly wind-swell.
TUESDAY 6th – SUNDAY 11th: Dry start on Tuesday but becoming wet and windy with rain and strong S’ly winds. Continuing rather changeable and unsettled at times with rain or showers. Some brighter, drier interludes. Often windy with mainly S to SW’ly winds. Chance of gales.
Sea State Tuesday: Possibly moderate to rough, with a 2 to 3 metre S’ly wind-swell.