Wednesday, March 4, 2015

Weather

Tuesday, March 3, 2015

 

HEADLINES

TODAY: Cool bright and breezy. Orkney mainly dry.

TONIGHT: Wintry showers. Winds easing for a time. Freshening again later.

TOMORROW: Mainly dry and bright. Fresh winds easing.

DAYS 3-5: Orkney drier and brighter. Some rain on Friday and Saturday. Windy and mild with chance of gales.

DAYS 6-10: Perhaps becoming drier and brighter with lighter winds.

 

SUMMARY

Orkney mainly dry and bright today though clouding over later with showers, wintry over hills, during the evening and at first tonight. Shetland bright with wintry showers falling as snow over the hills. Fresh SW’ly winds easing. Rather cloudy at first tonight with scattered showers, wintry over hills, mostly dying out later. Winds becoming cyclonic variable and later fresh NW’ly.

A few showers at first on Wednesday, wintry across the hills, otherwise dry and bright, Fresh NW’ly winds easing and backing W then freshening SW’ly later. Patchy rain or drizzle overnight with strong SW’ly winds. Cloudy with rain at first on Thursday, becoming brighter with showers and strong to gale-force SW’ly winds. A bright start on Friday, then clouding over with outbreaks of rain. Mild with strong to gale SW’ly winds.

A mild, cloudy weekend with rain at times and strong to gale-force SW’ly winds. The following week perhaps less unsettled, drier and brighter with lighter S to SW’ly winds freshening later.

 

GENERAL SITUATION AND SYNOPSIS 06:00 UTC

With a small, relatively shallow low off northwest Scotland a fresh SW’ly airflow covers the Northern Isles. This low is expected to run east overnight, probably very close to Orkney, This will result in the airflow becoming mainly light cyclonic before freshening N to NW’ly later in the night.

Wednesday will see a ridge building across the area, with a depression running through the Iceland area trailing its fronts across Scotland in a strong SW’ly airflow overnight into Thursday. Further fronts, carried along by a milder, strong SW’ly airflow are expected to follow on Friday. The current forecast expects this strong SW’ly airflow probably persisting through next weekend.

The prognosis suggests during the course of the following week Atlantic high pressure may drift in across the British Isles, bringing a lighter S to SW’ly airflow for a time and a strengthening S’ly later as the high moves away eastwards.

 

FORECAST FOR NEXT THREE DAYS

Cool today with a daytime high of around 5° Celsius and a low tonight of about 2° Celsius in Orkney, Shetland a degree cooler. Less cold on Wednesday with a high of 5° Celsius in Lerwick, 7° Celsius in Kirkwall, with overnight lows around 3° Celsius. Milder on Thursday with temperatures in the range 8° or 9° Celsius down to 4° or 5° Celsius.

TUESDAY 3rd: Orkney mainly dry and bright with sunny spells. However later in the afternoon it will cloud over, with showers developing, wintry over hills. Rather cloudy this evening with scattered showers, wintry over hills, but these mostly dying out later in the night. Winds becoming cyclonic variable and later F5 N to NW’ly.

Sea State: Moderate to rough or very rough, with 2 to 5 metre SW’ly wind swell. Later becoming SE’ly. Highest in the west.

WEDNESDAY 4th: A few showers at first, wintry across the hills, otherwise dry and bright with sunny intervals, F5 NW’ly winds easing F3 and backing W and then SW’ly, freshening F4-5 later. Patchy rain or drizzle overnight, with heavier rain later. SW’ly winds strengthening F6-7.

Sea State: Moderate to rough, with a 2 to 4 metre wind swell, N or NW’ly at first becoming SW’ly. Highest in the west.

THURSDAY 5th: Cloudy with rain during the morning but becoming brighter with showers early afternoon as F6 to gale F8 S to SW’ly winds veer F6-7 SW to W’ly. The night starting mainly dry with winds backing F4 SW’ly. Cloud thickening bringing mist and drizzle later.

Sea State: Rough to very rough, with a 3 to 5 metre SW’ly wind swell. Highest in the west.

 

10-DAY OUTLOOK

Milder with temperatures in the daily range 8° to 10° Celsius by day down to 6° or 7° Celsius overnight.

FRIDAY 6th: A milder, cloudy day with outbreaks of rain accompanied by strong SW’ly winds, perhaps increasing to gale-force later.

Sea State: In the west perhaps rough to very rough or high, with a 4 to 6 metre SW’ly wind swell. In the east perhaps moderate to rough, with a 2 to 4 metre SW’ly wind swell

SATURDAY 7th: Mostly cloudy with rain or drizzle and strong to gale-force SW’ly winds. Orkney perhaps becoming drier and brighter later.

Sea State: In the west perhaps very rough to high, with a 5 to 8 metre SW’ly wind swell. In the east perhaps rough to very rough, with a 3 to 5 metre SW’ly wind swell.

SUNDAY 8th – FRIDAY 13th: Sunday cloudy with rain at times, mainly across Shetland. Mild, but perhaps not feeling so in strong to gale-force SW’ly winds. The new week perhaps less unsettled, drier and brighter with lighter S to SW’ly winds freshening later.

Sea State Sunday: Possibly rough to very rough, with a 3 to 6 metre SW to W’ly wind swell. Highest in the west.

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