Weather Outlook for Orkney

Tuesday, July 29, at 2.01pm

 

HEADLINES

TODAY: Bright after rain. Showers later. Breezy.

TONIGHT: Showers. Windy.

TOMORROW: Sunshine and showers. Windy.

DAYS 3-5: Showers dying out as winds ease.

DAYS 6-10: Some showers. Mainly light or moderate winds. Risk of haar later.

SUMMARY

The afternoon starting bright with sunny spells with showers later. SW’ly winds strengthening. Further showers tonight with strong SW’ly winds veering W’ly.

Wednesday bright and showery, the showers becoming lighter and more isolated later. Strong W’ly winds. A band of heavy and possibly thundery showers crossing the area on Thursday. Fresh W to NW’ly winds. Drier and brighter on Friday with a few showers and light W’ly winds. Winds backing moderate SE’ly overnight.

Saturday cloudy with outbreaks of rain accompanied by misty conditions and hill fog. Mostly light E’ly winds. Sunday perhaps brighter with some showers and mostly moderate N’ly winds becoming light SW’ly.

Next week possibly mostly dry but with the risk of haar as mainly moderate winds turn SE’ly.

GENERAL SITUATION AND SYNOPSIS 06:00 UTC

A depression moving east from Iceland will drive an occluded front off the Atlantic and across the Northern Isles this morning. This will introduce a cooler and fresher showery SW’ly airflow across the area.

As the low continues east to the north of Shetland a W to NW’ly airflow will follow for Wednesday and Thursday, this easing on Friday as the low moves away over the Norwegian Sea.

During the weekend shallow low pressure developing over the UK and then moving north with the airflow backing SE to E’ly ahead of fronts pushed north over the Northern Isle.

For much of the remainder of the Outlook Period pressure is predicted to be low to the west or northwest of Scotland and high across Scandinavia. If so then this would result in a mainly moderate SE’ly airflow across northeast Scotland.

 

 

FORECAST FOR NEXT THREE DAYS

Confidence level: Weather type – medium/high. Timing – medium.

Daytime temperatures rising to 16° to 18° Celsius today and 15° or 16° Celsius on Wednesday and Tuesday. Overnight lows falling to around 10° Celsius.

TUESDAY 29th: After a cloudy start and a short period of light rain or drizzle crossing Orkney from the west earlier in the morning and Shetland around midday drier and brighter conditions will follow. Showers are likely to develop in the afternoon, these possibly heavy across Shetland. SW’ly winds will also strengthen F5. Mainly cloudy this evening and overnight with frequent showers, these heaviest in the west, becoming more exposed as F5-6 SW’ly winds veer F6 W’ly.

Sea State: Mostly slight increasing moderate to rough, with a 1 metre SW’ly wind-swell building 2 to 4 metres in the west and 2 metres in the east.

WEDNESDAY 30th: Quite bright and showery, but the showers will become lighter and more isolated through the day with longer sunny spells by the afternoon. F5-6 W’ly winds will remain strong.

Sea State: Slight to moderate in the east, with a 1 to 2 metre W’ly wind-swell. Moderate to rough in the west, with a 2 to 3 metre W’ly wind-swell

THURSDAY 31st: Bright with showers, these becoming more frequent as a band of heavy and possibly thundery showers will move down across the area on F5 W to NW’ly winds.

Sea State: Slight to moderate, with a 1 to 2 metre W to NW’ly wind-swell later turning SW’ly.

 

 

10-DAY OUTLOOK

Confidence level: Weather type – medium/low. Timing – low.

Daytime temperatures rising to 15° to 17° Celsius with overnight lows falling to around 10° Celsius.

FRIDAY 1st: Drier and brighter with sunny spells a few isolated showers and light W’ly winds backing moderate SE’ly.

Sea State: Slight to moderate, with a 1 to 2 metre SE’ly wind-swell turning SE’ly later. Highest in the west.

SATURDAY 2nd: Cloudy with outbreaks of rain accompanied by misty conditions and hill fog. Mostly light SE’ly winds.

Sea State: Perhaps slight in the east, with a 1 metre SE’ly wind-swell. Slight to moderate in the west, with a 1 to 2 metre SE’ly wind-swell

SUNDAY 3rd – FRIDAY 8th: Sunday perhaps brighter with some showers and mostly moderate W or NW’ly winds becoming SW’ly. The new week possibly mostly dry but with the risk of haar as mainly moderate winds turn SE’ly.

Sea State on Sunday: Possibly slight in the east, with a 1 metre SE to E’ly wind-swell. Slight to moderate in the west, with a 1 to 2 metre S to SW’ly wind-swell.

 
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