Bright today with occasional showers, some heavy and wintry, and strong W to NW値y winds. Cloudier overnight with outbreaks of rain reaching Orkney by midnight and Shetland in the early hours. The rain dying out over Orkney later. Strong SW to W値y winds.
Shetland mostly cloudy with rain at times on Tuesday. After a mostly dry start rain will return to Orkney later in the afternoon. Strong SW to W値y winds backing SW値y. Further rain at times through the evening and overnight with strong SW値y winds.
Colder on Wednesday and Thursday with wintry showers of sleet or snow. Friday less cold with sleet or rain showers. Mostly strong NW値y winds, possibly lighter N値y later,
The weekend and first part of next week perhaps bright at times with further showers, some wintry, and possibly moderate to fresh E or NE値y winds.
GENERAL SITUATION AND SYNOPSIS 06:00 UTC 24/01/2015
With a deep depression north of Iceland and high pressure to the southwest of the British Isles a strong, cool W値y airflow covers northern Scotland. This will back to a milder SW値y overnight as a flat ridge swings east over the UK.
A relatively mild SW値y is likely to persist through Tuesday, with a trailing warm front crossing the Northern Isles during the day and further fronts following through the evening and overnight.
With low pressure expected to transfer east into the southern Norwegian Sea Wednesday will see the return of a cooler and showery W値y airflow. With the low forecast to drift north along the Norwegian coast a colder N値y airflow is expected by Thursday.
The current prognosis suggests the weekend may see low pressure migrating south over the North Sea and then into Europe, possibly bringing a slacker E to NE値y airflow over northeast Scotland.
FORECAST FOR NEXT THREE DAYS
Cool on today with temperatures around 5ｰ Celsius and falling little tonight. Milder on Tuesday with daytime temperatures around 8ｰ Celsius. Then cooler overnight with a low of, around 4ｰ Celsius. Cool on Wednesday with a high of about 5ｰ down to a low around 1ｰ Celsius.
MONDAY 26th: Bright with some sunny periods and occasional showers, some heavy with hail and wintry over the hills. The showers passing by quickly, driven along by F6 W to NW値y winds. Clear spells and a few showers this evening then cloudier overnight with outbreaks of rain reaching Orkney by midnight and Shetland in the early hours. The rain dying out over Orkney later. F6 SW to W値y winds.
Sea State: Rough to very rough, with a 3 to 6 metre W値y wind-swell.
TUESDAY 27th: Shetland mostly cloudy with outbreaks of rain through much of the day. Mainly dry over Orkney for a time with some brightness possible before cloud thickens and rain returns later in the afternoon. F6-7 SW to W値y winds backing SW値y. Further rain at times through the evening and overnight with F6 SW値y winds.
Sea State: Rough or very rough, with a 3 to 5 metre SW値y wind-swell.
WEDNESDAY 28th: A cloudy start with rain then becoming drier and brighter with showers turning wintry later as F6-7, locally gale F8, SW値y winds veer W then NW値y.
Sea State: Rough to very rough, with a 3 to 5 metre W値y wind-swell. Highest in the west.
TEN DAY OUTLOOK
Temperatures in the daily range 5ｰ Celsius down to 3ｰ Celsius at first. Perhaps a degree or so less cool later.
THURSDAY 29th: Cold with wintry showers of sleet or snow. Strong NW値y winds, possibly easing and backing W値y for a time, veering NW値y and strengthening again later.
Sea State: Rough to very rough, with a 3 to 6 metre W or NW値y wind-swell. Highest in the west.
FRIDAY 30th: Perhaps less cold with wintry showers turning more to rain. Lighter N値y winds.
Sea State: Perhaps rough to very rough, with a 3 to 6 metre NW値y wind-swell. Highest in the west.
SATURDAY 31st - THURSDAY 5th: Perhaps bright at times with further showers, some wintry, and possibly moderate to fresh E or NE値y winds.
Sea State Saturday: Possibly rough to very rough, with a 3 to 5 metre E or NE値y wind-swell. Highest in the west.