Weather

Thursday, July 30, 2015

 

TODAY: Bright cool and breezy with a few showers.

TONIGHT: Chance of a shower in Shetland. Rain into Orkney later. Lighter winds.

TOMORROW: Rain extending north.

DAYS 3-5. Sunshine and showers for Saturday. Chance of thunder. Sunday mostly dry and bright. Rain returning for Monday. Becoming windy.

DAYS 6-10: Unsettled at first with rain or showers and windy at times. Improving later.

 

SUMMARY

Bright today with a few scattered light showers, these dying out across Orkney during the afternoon. Fresh N to NW’ly winds, occasionally strong over Shetland at first. Scattered light showers over Shetland tonight. Winds falling light. Orkney dry but patchy rain or drizzle later. A light SW’ly breeze developing.

Shetland starting Friday dry, but cloud and showery rain across Orkney will extend erratically across Shetland during the afternoon. S to SW’ly winds freshening.

Saturday bright with showers, some heavy and possibly thundery, particularly across Orkney. Milder with moderate S’ly winds becoming light and variable. Sunday mostly dry and bright with light winds. A SE’ly breeze freshening later.

A dry start on Monday but strengthening SE’ly winds soon bringing rain in from the south. Tuesday rather cloudy with outbreaks of rain and fresh SE’ly winds. Wednesday and Thursday perhaps drier and brighter with scattered showers and lighter SW’ly winds. The end of the week and weekend possibly mainly dry and bright with light or moderate SW’ly winds tending SE’ly.

 

GENERAL SITUATION AND SYNOPSIS 06:00 UTC

A fresh N to NW’ly airflow will ease today as a low over southern Scandinavia moves away and a ridge swings east over northern Scotland.

A depression to the west of Scotland, will push fronts across the Northern Isles on Friday, bringing a milder S to SE’ly airflow. The filling low is expected to drift across the Northern Isles during the course of the weekend.

Present forecasts suggest a depression may then track east to become slow-moving to the west of Scotland for a time, bringing rather unsettled conditions across the Northern Isles for the first part of next week. Some improvement later as the low drifts away towards Iceland as a filling feature.

 

 

FORECAST FOR NEXT THREE DAYS

Daytime temperatures 13° or 14° Celsius for Kirkwall and 12° or 13° Celsius for Lerwick. Overnight lows around 8° Celsius. A degree or so milder by the weekend.

 

THURSDAY 30th: Bright with sunny spells and a few scattered light showers, these dying out across Orkney during the afternoon. F5 N to NW’ly winds, occasionally F5-6 over Shetland at first.

Some sunshine this evening though with scattered light showers over Shetland. Winds falling light. Later in the night cloud will extend into Orkney from the southwest bringing some patchy rain or drizzle. A light F3 SW’ly breeze developing.

Sea State: Slight to moderate in Orkney waters, with a 1 to 2 metre N’ly wind-swell. At first around Shetland, moderate to rough, with a 2 to 3 metre N’ly wind-swell. Highest in the north. Later becoming generally light to moderate, with a 1 to 2 metre W’ly wind-swell.

FRIDAY 31st: Shetland starting dry with some early sunshine, but cloud and showery rain across Orkney will extend erratically across Fair Isle then the rest Shetland during the afternoon and evening. S to SW’ly winds freshening F5.

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

SATURDAY 1st: Bright with sunshine and showers, some heavy with the risk of thunder, particularly across Orkney. Milder with F4 S’ly winds becoming light and variable.

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

 

 

10-DAY OUTLOOK

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

 

SUNDAY 2nd: Mostly dry and sunny with light winds. A SE’ly breeze freshening later.

Sea State: Moderate to slight, with a 1 to 2 metre W’ly wind-swell turning S to SE’ly.

MONDAY 3rd: A dry start but strengthening SE’ly winds soon bringing rain in from the south.

Sea State: Perhaps moderate to rough, with a 2 to 3 metre SE’ly wind-swell.

TUESDAY 4th -SUNDAY 9th: Monday and Tuesday rather cloudy with outbreaks of rain and fresh S to SE’ly winds. Wednesday and Thursday perhaps drier and brighter with scattered showers and lighter SW’ly winds. The end of the week possibly mainly dry and bright with light or moderate winds.

Sea State Tuesday: Possibly mostly moderate, with a 2 metre S’ly wind-swell.

 

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