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SUMMARY

A rather cloudy start for Orkney, but becoming brighter. Bright at first in Shetland but then clouding over for a time before turning brighter again for the evening. Clear spells continuing overnight though a few showers developing later. Light and rather variable winds settling light SW値y.

Tuesday soon becoming dry and bright, though low cloud and later mist and fog patches, is likely to spread in during the day.

Mostly cloudy on Wednesday and Thursday with mist or fog patches. Dry at first but a few outbreaks of mainly light rain or drizzle later. Light or moderate SW値y winds. Cloudy with some rain on Friday, turning brighter with showers later as winds become moderate or fresh W値y.

The weekend and into the following week more changeable than present with some rain or showers and fresher SW値y winds.

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GENERAL SITUATION AND SYNOPSIS 06:00 UTC 20/04/2015

A large area of high pressure will remain slow-moving over the British Isles for the next few days. However, its influence is expected to slowly weaken in the far north, with the present slack circulation over the Northern Isles becoming a light SW値y. This is likely to pull milder and moister air round its western flank and across the area by midweek.

The high is forecast to move away over Continental Europe during the latter part of the week, allowing fronts, associated with low pressure moving east from Iceland, to trail east over northern Scotland. Present predictions suggest a changeable SW to W値y airflow for the weekend and into the start of the following week.

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FORECAST FOR NEXT THREE DAYS 

Temperatures in the range 10ー to 12ー Celsius by day, down to around 6ー Celsius overnight.

MONDAY 20th: Orkney and Fair Isle beginning rather cloudy, and Shetland brighter with early sunshine. Orkney and Fair Isle - then becoming brighter with good sunny spells developing by the afternoon. Shetland clouding over for a time during the afternoon but then brighter again. Most places then seeing some evening sunshine. Clearer spells continuing overnight, though a few showers are likely to develop later. Winds remaining light, rather variable in direction at first, but then settling SW値y.
Sea State: Mostly slight, with a 1 metre S値y wind-swell.

TUESDAY 21st: Some early showers, but these will die out, with sunny spells developing. However, low cloud is likely to develop during the day, with mist and fog patches later. Mostly light F2-3 SW値y winds.
Sea State: Slight to moderate, with a 1 to 2 metre W値y wind-swell.

WEDNESDAY 22nd: Dry but rather cloudy with mist or fog patches. Light winds across Orkney, a F3-4 SW値y over Shetland.
Sea State: Slight to moderate, with a 1 to 2 metre W値y wind-swell.

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TEN DAY OUTLOOK

Highs of 9ー or 10ー Celsius by day and lows of 4ー to 6ー Celsius overnight.

THURSDAY 23rd: Mostly cloudy with mist or fog patches. Some outbreaks of mainly light rain or drizzle. Light or moderate SW値y winds.
Sea State: Slight to moderate, with a 1 to 2 metre SW値y wind-swell. Highest in the west.

FRIDAY 24th: Cloudy with some rain but turning brighter with showers later as winds become moderate or fresh W値y.
Sea State: Perhaps moderate to rough, with a 2 to 3 metre W値y wind-swell. Highest in the west.

SATURDAY 25th - THURSDAY 30th: Bright with showers and moderate W to NW値y winds on Saturday. Then changeable with some rain or showers and fresh SW値y winds.
Sea State Saturday: Possibly moderate to rough, with a 2 to 3 metre N値y wind-swell. Highest in the west.

 

10-Day Weather Outlook
for Shetland, Orkney and Caithness

Page updated
Monday 20 April, 2015 17:01

WEATHER HEADLINES

  Today

Dry with variable cloud amounts. Light winds.

  Tonight

Clear spells. Light winds. A few showers later.

  Tomorrow

Becoming dry but cloudy with mist and fog patches. Light winds.

  Days 3 5

Cloudy on Wednesday and Thursday with mist or fog patches. Some patchy rain or drizzle later. Turning brighter on Friday with showers later. Fresher winds.

Days 6-10

Changeable with some rain or showers. Occasionally fresh winds

 

FAIR ISLE WEATHER DATA
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Cumulonimbus with anvil (CL9)
16th December 2006, 0904z
Cumulonimbus with anvil (CL9) Looking NNE
.
Showery SW to W'ly airflow
Temp 6.1°C, dew point 1.6°C, wind 240° 17kt

Cumulus mediocris developing over Fair Isle
24th May 2006, 1300z
Cumulus mediocris developing over Fair Isle
and forming a 'clouc street' downwind
of the Isle (CL2)
Temp 9.0°C, dew point 4.5°C, wind F2 S'ly.
Stratocumulus formed from the spreading out of cumulus
24th May 2006, 2001z
Stratocumulus formed from the
spreading out of cumulus (CL4)

Temp 7 °C, dew point 5 °C, wind F3 W'ly
Approaching shower. Cumulonimbus with anvil
24th May 2006, 2016z
Approaching shower.
Cumulonimbus with anvil (CL9)

Temp 7 °C, dew point 5 °C, wind F3 W'ly
Showers over Shetland and passing through the Fair Isle Channel
24th May 2006, 2034z
Showers over Shetland and passing through
the Fair Isle Channel. Cumulonimbus with anvil

Temp 7 °C, dew point 5 °C, wind F3 W'ly

 

Fair Isle, South LighthouseFair Isle, South Lighthouse


Full moon rising
1700 UTC 25th October

Full moon rising


SYNOPSIS DAYS 1-3 DAYS 4-10
Disclaimer CHARTS


Shetland Weather Review
2004-2010

 

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DISCLAIMER
This outlook is based on an appraisal of the charts and ensembles from GFS, ECMWF, UKMO and FAX available via the internet, and over 30 years of local weather experience.

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-dependant 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.


Please note that this page is usually updated every day (around mid-morning) but on occasions updates may be irregular. A daily service by e-mail is available, but is charged for.

If you wish you can have the 10-day Outlook e-mailed to you free once a week (usually at the weekend). Please contact Fair Isle Weather Services for further information
.


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aurura glow

Aurora glow, looking north towards Ward Hill
(l ights of Setter croft foreground)
Photograph taken about 2100UTC 18th October 2007
Pentax K10D with Pentax DA 16-45mm F4 w/a lens set at 16mm
Exposure 193 seconds at F5.6 ISO100

AuroraWatch www.dcs.lancs.ac.uk/iono/aurorawatch/

 

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Bright with an occasional shower. Light winds freshening across Shetland.