Met Office

High seas forecast

Issued at 2000 UTC on Monday 11 December 2017
by the Met Office, Exeter, United Kingdom
for the period 2000 UTC Monday 11 December until 2000 UTC Tuesday 12 December 2017

Storm warnings

At 111200UTC, low 59 north 49 west 959 expected 63 north 34 west 960 by 121200UTC. Winds will reach storm force 10 in the southern semi-circle within 400 miles of the low centre, and the northwestern quadrant, within 300 miles of the low centre, throughout the period. Southwesterly winds will reach violent storm force 11 at times in the west of west northern section between 58 north and 61 north until 120600UTC. Northeasterly winds will reach violent storm force 11 at times in the far northwest of west northern section and the far west of Denmark Strait until 121400UTC

General synopsis

At 111200UTC, low 59 north 49 west 959 expected 63 north 34 west 960 by 121200UTC. High 38 north 37 west 1033 expected 48 north 33 west 1034 by same time. Low 61 north 01 east 989 losing its identity. New low expected 67 north 04 east 988 by 121200UTC. New high expected eastern Greenland 1000 by same time

Area forecasts for the next 24 hours

Sole

North or northwest 7 or gale 8, decreasing 5 or 6, then backing west or southwest 5 to 7 later. Rough or very rough. Squally showers, rain later. Good, occasionally poor.

Shannon

North 6 to gale 8, backing northwest 5, backing south, then veering west later, 5 to 7, perhaps gale 8 later. Rough or very rough. Rain or showers. Good, occasionally poor.

Rockall

North 6 to gale 8, backing northwest 5, backing south, then veering west later, 5 to 7, perhaps gale 8 later. Rough or very rough. Rain or showers. Good, occasionally poor.

Bailey

North 5 to 7, becoming variable 4, becoming south, then veering west later, 5 to 7, perhaps gale 8 later. Rough or very rough. Rain or showers. Good, occasionally poor.

Faeroes

North 5 to 7, becoming variable 4, then south 5 to 7 later. Rough, occasionally moderate. Showers, rain later. Good, occasionally poor later.

Southeast Iceland

Northerly 4 or 5, becoming variable 4, then cyclonic 5 to 7, perhaps gale 8 later. Rough. Wintry showers, then rain. Good, occasionally poor.

East Northern Section

In east

Southerly 5 or 6, increasing 7 or gale 8, then veering westerly, decreasing 4 or 5 later in far north. Rough or very rough, becoming very rough or high, occasionally very high later. Rain for a time, then wintry showers. Moderate or good, occasionally poor.

In west

Cyclonic in far north, otherwise southerly veering westerly, 6 to gale 8, increasing severe gale 9 at times. Rough or very rough, becoming high or very high. Rain, occasionally thundery, then wintry showers. Moderate or good, occasionally poor.

West Northern Section

Cyclonic in north, westerly or southwesterly in south, gale 8 to storm 10, occasionally violent storm 11 until later in west. High or very high, occasionally very rough at first in north. Rain, snow or wintry showers. Moderate or poor, occasionally very poor. Light to moderate icing in far northwest.

East Central Section

In southeastern half of area

Northwesterly 5 or 6, backing southwesterly, then veering westerly, 5 to 7, occasionally gale 8 later. Rough or very rough, occasionally high at first in far southeast. Rain for a time. Good, becoming moderate or poor for a time.

In northwestern half of area

Southwesterly veering westerly, then becoming cyclonic later in south, 5 to 7, increasing gale 8 or severe gale 9 at times. Rough or very rough, becoming very rough or high in north. Rain or showers, mainly fair for a time. Moderate or good, occasionally poor.

West Central Section

In north

Westerly or southwesterly 6 to gale 8, occasionally severe gale 9 in north. Very rough or high. Rain at times. Wintry showers later. Moderate or good, occasionally poor.

In south

Southwesterly becoming cyclonic, 5 to 7, increasing gale 8 for a time. Rough or very rough. Occasional rain, thundery at times. Moderate or good, occasionally poor.

Denmark Strait

In area west of 30 west

Easterly or northeasterly gale 8 to storm 10, occasionally violent storm 11 until later in west. Very rough or high, occasionally very high in west. Rain, sleet or snow. Poor or very poor, occasionally moderate. Moderate or severe icing near ice edge with temperatures ms02 to ms05.

In rest of area

Easterly or northeasterly, 4 or 5 at first in north, otherwise 6 to gale 8, occasionally severe gale 9 at first in south. Moderate or rough, becoming very rough or high in south. Mainly fair, then rain, sleet and snow spreading north. Good, becoming moderate, occasionally very poor. Moderate or severe icing developing near ice edge with temperatures ms02 to ms05.

North Iceland

Cyclonic, becoming mainly easterly or northeasterly, 4 or 5, becoming easterly or southeasterly 6 or 7 in far southwest, occasionally gale 8 later. Moderate, occasionally rough in south. Wintry showers, rain later in far southwest. Good, occasionally poor.

Norwegian Basin

Cyclonic 4 or 5, increasing 6 at times. Moderate or rough in west, slight or moderate in east. Wintry showers. Good, occasionally poor.

Outlook for following 24 hours

Storms expected in Shannon, Rockall, both northern sections, both central sections and Denmark Strait. Gales or severe gales expected in all other areas.

Unscheduled storm warnings are broadcast via Safetynet and in bulletin WONT54 EGRR available via some internet and ftpmail outlets

Storm warnings

Storm warnings, issued by the Met Office, on behalf of the Maritime and Coastguard Agency.

West Northern Section and Denmark Strait.

Issued: 2000 UTC on Monday 11 December 2017

At 111200UTC, low 59 north 49 west 959 expected 63 north 34 west 960 by 121200UTC. Winds will reach storm force 10 in the southern semi-circle within 400 miles of the low centre, and the northwestern quadrant, within 300 miles of the low centre, throughout the period. Southwesterly winds will reach violent storm force 11 at times in the west of West Northern Section between 58 north and 61 north until 120600UTC. Northeasterly winds will reach violent storm force 11 at times in the far northwest of West Northern Section and the far west of Denmark Strait until 121400UTC.