Weather

Monday, April 27, 2015

 

HEADLINES

TODAY: Cold and bright. Some showers. Fresh winds easing.

TONIGHT: Cold. A few showers. Light winds.

TOMORROW: Bright. Some showers. Mostly light winds.

DAYS 3-5. Bright with showers on Wednesday, rain possible for Orkney later. Becoming breezy. Cold, bright, showery and windy on Thursday. Friday drier and brighter with lighter winds.

DAYS 6-10: Cool and bright with a few showers. Mostly moderate or light winds.

 

SUMMARY

Orkney may see a few sleet or snow showers at first today, otherwise mainly dry and bright. Shetland bright and a few wintry showers. Fresh to strong W’ly winds easing and backing SW to S’ly. Mainly dry tonight with some clear spells, though a few showers across Shetland later, where S’ly winds will be fresh to strong. Lighter SW’ly winds for Orkney.

Bright on Tuesday with some wintry showers of rain or hail. Winds light to moderate S to SW’ly though fresh over Yell and Unst at first. Clear spells and occasional showers overnight with light SW’ly winds. Bright with some showers on Wednesday, perhaps more persistent rain across Orkney later. Freshening E’ly winds backing NE to N’ly.

Feeling cold on Thursday with fresh to strong N’ly winds, scattered wintry showers and sunny or clear spells. Friday becoming drier and brighter as N’ly winds fall light with sunny or clear periods and just an occasional mainly light wintry shower.

A fine weekend with sunny periods and light winds. Clear spells overnight bringing the risk of a grass frost. The first part of the following week possibly continuing cool and mainly dry with mostly light or moderate NW to N’ly winds and risk of overnight frosts.

 

GENERAL SITUATION AND SYNOPSIS 06:00 UTC

A slow moving depression near Iceland will maintain a cool though easing SW’ly showery airflow across the north of Scotland for the next 24 to 36 hours. However, it is expected to sink south then drift east across the north of mainland Scotland, bringing a freshening E’ly airflow to the Northern Isles on Wednesday.

As these clear – and with pressure expected to build to the west – a W’ly airflow will become NW’ly, drawing colder air southwards into Scotland. By Friday it is forecast to be over southern Scandinavia, backing the airflow to a fresh N’ly over eastern and northern Scotland as pressure builds to the west.

The present prognosis indicates the East Greenland High may then build a ridge southwards during the weekend, supporting a more settled, drier and cool mostly light N’ly airflow across northern Scotland well into next week.

 

FORECAST FOR NEXT THREE DAYS

Cool with a daytime high of 7° to 9° Celsius and an overnight low of 2° to 4° Celsius.

MONDAY 27th: Another cold day, Orkney may see a few sleet or snow showers at first, but most of the day will be dry with some sunshine. Shetland will have a mixture of sunny spells and a few wintry showers. F5-6 W’ly winds easing and backing SW to S’ly. Mainly dry tonight with some clear spells, though a few showers developing later, mainly affecting Shetland, where S’ly winds will be F5-6. F4 SW’ly winds for Orkney.

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

TUESDAY 28th: Bright with sunny spells and some showers, these possibly heavy at first though mainly of rain or hail. F5 S’ly winds over Yell and Unst at first, otherwise F2-4 S to SW’ly. Clear spells and occasional showers overnight with light SW’ly winds.

Sea State: Mostly moderate, with a 2 metre SW to S’ly wind-swell turning SE’ly.

WEDNESDAY 29th: Sunshine and showers, perhaps more persistent rain edging into Orkney later. Freshening E’ly winds backing F5 NE to N’ly.

Sea State: Mostly moderate, with a 2 metre SE’ly wind swell turning E then  NE to N’ly.

 

10-DAY OUTLOOK

Cool with daytime highs of 7° to 9° Celsius. Overnight lows of 2° to 4° Celsius, perhaps close to freezing on calm, clear nights.

THURSDAY 30th: Feeling cold with fresh to strong N’ly winds, scattered wintry showers and sunny or clear spells.

Sea State: Mostly moderate, with a 2 metre NW to N’ly wind-swell.

FRIDAY 1st: Becoming drier and brighter as N’ly winds fall light with sunny or clear periods and just an occasional mainly light wintry shower.

Sea State: Perhaps mostly moderate, with a 2 metre NW’ly wind-swell.

SATURDAY 2nd – THURSDAY 7th: A fine weekend with sunny periods and light variable winds. Clear spells overnight bringing the risk of a grass frost. The first part of the following week possibly continuing cool and mainly dry with mostly light or moderate NW to N’ly winds and risk of overnight frosts.

Sea State Saturday: Possibly slight to moderate, with a 1 to 2 metre S’ly wind-swell. Highest in the west.

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