Weather Outlook for Shetland – Tuesday, 10th September 2013 at 12:47

WEATHER OUTLOOK FOR SHETLAND

Tuesday, 10th September 2013 at 12:47

HEADLINES

TODAY: Dry but rather cloudy. Wind easing.
TONIGHT: Patchy rain becoming more widespread.
TOMORROW: Rain and mist clearing.
DAYS 3-5: Rain then showers. Becoming breezy.
DAYS 6-10: Unsettled and windy at first with chance of gales. Then drier with easing wind.

SUMMARY

Rather cloudy though mainly dry today with a few brighter periods. Feeling cool in a fresh but easing NW’ly wind. Rain, patchy at first, becoming more widespread overnight. Light NW to W’ly winds backing moderate SW’ly.

Cloudy and misty with outbreaks of rain at first on Wednesday, turning drier and brighter with moderate SW’ly winds veering NW’ly by the afternoon.

Thursday starting dry then rain and strengthening S to SW’ly winds later. Friday bright with sunny spells, showers and fresh SW’ly winds.

Fewer showers and lighter winds to start the weekend but becoming wet and windy with the likelihood of a SW’ly gale.

Next week probably starting unsettled and windy with blustery showers and the chance of a SW to W’ly gale. Perhaps becoming mostly dry with lighter winds for a time midweek then possibly unsettled again.

GENERAL SITUATION AND SYNOPSIS 06:00 UTC

A NW’ly airflow will slowly ease today as a ridge moves in from the west. This will then decline with the airflow backing SW’ly ahead of an occluding warm front moving east towards the Northern Isles tonight.

The front will clear east around midday on Wednesday, the moderate SW’ly airflow veering W or NW’ly as it does so. The airflow will later back SW’ly as a weak ridge moves east overnight.

A strong S or SW’ly airflow will develop later on Thursday, as a small frontal disturbance tracks east across the north of Scotland and a cold front moves towards the Northern Isles. As this clears east and Atlantic high pressure ridges northeast across the UK Friday will see a showery SW’ly airflow across northern Scotland as.

Through the weekend and for much of next week a deep depression, forecast to develop south of Iceland and then move northeast into the Norwegian Sea, is likely to bring an unsettled and strong SW to W’ly airflow across northern Scotland.

FORECAST FOR NEXT THREE DAYS

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

Temperatures in the daily range 12° to 14° Celsius down to an overnight low of about 9° Celsius.

TUESDAY 10^th: Rather cloudy though it will be mainly dry with just the small risk of a light shower. A few brighter periods and perhaps even a few brief spells of sunshine. Feeling cool in a F5 NW’ly wind, though this will gradually ease F4 through the day. Mostly dry this evening but patchy rain developing overnight and this becoming more persistent and widespread later. F2-3 NW to W’ly winds backing moderate SW’ly.

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

WEDNESDAY 11^th: Cloudy with outbreaks of rain at first. Also becoming misty with hill fog. By midday Orkney will be turning drier and brighter with Shetland similarly during the afternoon. F4 SW’ly winds veering NW’ly as the rain and mist clears. Mainly dry though rather cloudy overnight. F4 NW’ly winds backing SW’ly.

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

THURSDAY 12^th: Starting dry then rain arriving later asF3-4 S to SW’ly winds increase F5-6. The rain clearing east overnight.

Sea State: Slight to moderate, with a 1 to 2 metre S’ly wind-swell turning SW to W’ly and increasing moderate to rough, with a 2 to 4 metre wind-swell. Highest in the west.

10-DAY OUTLOOK

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

Daytime temperatures 13° to 15° Celsius. Overnight lows about 9° Celsius.

FRIDAY 13^th: Bright with sunny spells, showers and fresh SW’ly winds.

Sea State: Moderate to rough, with a 2 to 4 metre SW’ly wind-swell. Highest in the west.

SATURDAY 14^th: Fewer showers and lighter winds at first but becoming wet and windy through the afternoon and evening.

Sea State: Perhaps moderate to rough, with a 2 to 4 metre W’ly wind-swell. Highest in the west.

SUNDAY 15^th – FRIDAY 20^th: Rain clearing to blustery showers by Sunday with strong to gale-force SW’ly winds. The first part of the new week probably starting unsettled and windy with blustery showers and the chance of a SW to W’ly gale. Perhaps becoming mostly dry by midweek with lighter NW’ly winds but the week possibly ending unsettled with rain or showers and fresh or strong SW’ly winds.

Sea State Sunday: Possibly moderate to rough, with a 2 to 4 metre W or NW’ly wind-swell. Highest in the west.

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DISCLAIMER

Be aware that the weather over north-west Europe – and especially around the Northern Isles – is part of an ever-changing and dynamic system. Therefore regard the ’10-Day Outlook’ as a guide only – there are times when any outlook going beyond about 36 to 48 hours is likely to prove
unreliable.

Always check the latest forecast from the UK Met Office before undertaking any weather-dependent activity.

All forecasts are for planning purposes only.

Neither Dave Wheeler, nor any employee of Fair Isle Weather Services, accepts any liability for the accuracy of this forecast.

Dave Wheeler MBE FRMetS

Field

Fair Isle

Shetland, ZE2 9JU

Telephone: +44 (0)1595760224

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