Weather Outlook for Orkney

Tuesday, September 16, at 1.22pm

HEADLINES

TODAY:Rain moving north. Misty with hill fog. Mostly moderate winds.

TONIGHT: Orkney mainly dry. Rain in Shetland. Hill and coastal fog. Moderate winds.

TOMORROW: Becoming mostly dry. Mist and fog. Shetland brighter later. Light or moderate winds.

DAYS 3-5: Mainly dry and bright. Light winds.

DAYS 6-10:Fair for a time. Changeable later with freshening winds.

 

 

SUMMARY

Occasionally heavy rain across Orkney edging north into southern Shetland by the afternoon. The rain will be accompanied by misty conditions with hill fog. Orkney becoming drier and a little brighter. Moderate to fresh SE to E’ly winds. Cloudy tonight with some mist, low cloud and haar. Further outbreaks of rain across Shetland but Orkney largely dry. Moderate SE’ly winds.

Wednesday starting dull and misty with extensive low cloud and some fog. This is likely to be slow to clear from Orkney, but parts of Shetland could see some brightness later. Mainly dry but with the chance of an isolated shower at first. Moderate SE’ly winds.

Some showers at first on Thursday, then becoming dry and bright with moderate or light SE’ly winds. Rather cloudy on Friday with the chance of some showers for the afternoon. Winds falling light and variable. A mainly dry and bright weekend with light and variable winds becoming light NW’ly.

Perhaps a fine dry, bright start to the following week with light winds. Later in the week possibly turning more changeable with freshening SW’ly winds.

 

GENERAL SITUATION AND SYNOPSIS 06:00 UTC

With a large anticyclone centred over Scandinavia a moist SE to E’ly airflow covers the Northern Isles. A showery trough will affect the area during the next 24 hours.

During the course of the week the anticyclone is expected to drift further east, however pressure is expected to remain high over the southern Norwegian Sea and northern Scotland. This is forecast to persist during the weekend and the first part of next week maintaining reasonably settled conditions over the Northern Isles.

After midweek this may decline, with Icelandic low pressure then possibly introducing a changeable SW’ly airflow over northern and western Scotland.

 

FORECAST FOR NEXT THREE DAYS
Confidence level: Weather type – medium/high. Timing – medium.

Daytime temperatures rising to between 13° and 15° Celsius, but perhaps 17° Celsius in any sunshine on Wednesday. Overnight lows falling to about 11° Celsius.

TUESDAY 16th: Occasionally heavy rain across Orkney at first, this slowly edging north over Fair Isle and reaching southern Shetland during the afternoon. The rain will be accompanied by misty conditions with hill fog. At the same time Orkney becoming drier and a little brighter. F4 SE to E’ly winds but F5 around Fair Isle. Cloudy this evening and overnight with some mist, low cloud and haar. Further outbreaks of rain across Shetland and Fair Isle but Orkney staying largely dry. F4 SE’ly winds.

Sea State: Slight to moderate, with a 1 to 2 metre SE’ly wind-swell.

WEDNESDAY 17th: Starting dull and misty with extensive low cloud and some fog. This is likely to be slow to clear from Orkney and Fair Isle, but parts of Shetland could see some warm sunshine developing by the afternoon. Mainly dry but with the chance of an isolated shower at first. F4 SE’ly winds.

Sea State: Slight to moderate, with a 1 to 2 metre SE’ly wind-swell.

THURSDAY 18th: Some showers at first, then becoming dry and bright with some sunshine. F3-4 SE’ly winds.

Sea State: Slight to moderate, with a 1 to 2 metre SE’ly wind-swell.

 

10-DAY OUTLOOK
Confidence level: Weather type – medium/low. Timing – low.

Temperatures 13° to 15° Celsius by day down to around 9° Celsius overnight.

FRIDAY 19th: Rather cloudy with the chance of some showers for the afternoon. Winds falling light and variable.

Sea State: Mainly slight, with a 1 metre or less SE turning N’ly wind-swell. Also a W’ly swell.

SATURDAY 20th: A fine dry, bright day with light variable winds.

Sea State: Perhaps mainly slight, with a 1 metre or less N’ly wind-swell. Also a W’ly swell.

SUNDAY 21st – FRIDAY 26th:A mainly dry and bright on Sunday with light NE or N’ly winds. Perhaps a fine dry, bright start to the week with light winds. Later possibly turning more changeable with freshening SW’ly winds.

Sea State on Sunday: Possibly mainly slight, with a 1 metre or less E or NE’ly wind-swell. Also a W’ly swell.

 
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