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High seas forecast

Issued at 2000 UTC on Wednesday 12 December 2018
by the Met Office, Exeter, United Kingdom
for the period 2000 UTC Wednesday 12 December until 2000 UTC Thursday 13 December 2018

Storm warnings

At 121200UTC, low 53 north 26 west 948 expected 58 north 18 west 980 by 131200UTC. Winds will continue to reach storm force 10 at times in the southwestern quadrant between 75 miles and 200 miles of the centre until 130600UTC. New low expected 49 north 42 west 955 by same time. Easterly winds will reach storm force 10 between 49 north and 51 north in the far west of West Central Section between 130800UTC and 131200UTC. Winds will also reach storm force 10 at times in the southern semi-circle between 75 miles and 300 miles of the centre after 130800UTC. Winds will also reach violent storm force 11 at times in the southern semi-circle between 100 miles and 225 miles of the centre after 13100UTC. new low expected 62 north 36 west 977 by that time. northeasterly winds are expected to reach storm force 10 at times in the far northwest of West Northern Section and the far southwest of Denmark Strait after 131500UTC

General synopsis

At 121200UTC, low 53 north 26 west 948 expected 58 north 18 west 980 by 131200UTC. New lows expected 49 north 42 west 955, 62 north 36 west 977 and 49 north 07 west 1002 by same time. High 63 north 11 east 1036 expected 64 north 35 east 1036 by that time. at 121200UTC, high 71 north 28 west 1006 expected 71 north 28 west 1009 by 131200UTC. Lows 63 north 40 west 970 and 75 north 17 west 995 losing their identities

Area forecasts for the next 24 hours

Sole

South becoming cyclonic, mainly northwest, 7 to severe gale 9, decreasing 5 or 6 later. Very rough or high. Rain or thundery showers. Moderate or good, occasionally poor.

Shannon

Southeast veering west or southwest, 7 to severe gale 9, decreasing 5 or 6 later. Very rough or high. Rain or thundery showers. Moderate or good, occasionally poor.

Rockall

Southeast veering west or southwest, 7 to severe gale 9, decreasing 5 or 6 later. Very rough or high. Rain or thundery showers. Moderate or good, occasionally poor.

Bailey

Southeast 6 to gale 8, increasing severe gale 9 at times. Very rough or high. Occasional rain. Good, occasionally poor.

Faeroes

Southeasterly 5 or 6, increasing 7 to severe gale 9. Very rough, becoming high later. Occasional rain. Good, occasionally poor.

Southeast Iceland

Southeasterly 5 or 6, increasing 7 to severe gale 9. Very rough, becoming high later. Occasional rain. Good, occasionally poor.

East Northern Section

In north

Easterly or southeasterly, becoming cyclonic later, 6 to gale 8, occasionally severe gale 9 in far east. Very rough or high. Rain or showers. Moderate or poor, occasionally good.

In south

Cyclonic becoming southerly or southwesterly later, 6 to gale 8, increasing severe gale 9 at times. Very rough or high, occasionally very high at first in south. Occasionally rain or squally showers. Moderate or good, occasionally poor.

West Northern Section

In far northwest

Easterly or southeasterly 5 to 7, backing northeasterly 7 to severe gale 9, occasionally storm 10 later. Rough or very rough, occasionally high later. Occasional rain, sleet or snow. Moderate or poor, occasionally very poor.

In south

Westerly or northwesterly 7 to severe gale 9, occasionally storm 10 at first in far southeast, backing southeasterly 6 to gale 8 later, then backing easterly or northeasterly 7 to severe gale 9 later in far south. Very rough or high, occasionally rough later. Occasional rain or wintry showers, rain or snow later in south. Moderate or good, occasionally poor, becoming poor or very poor later in south.

In rest of area

Easterly or southeasterly 5 or 6, becoming cyclonic 5 to 7, increasing gale 8 at times. Rough or very rough. Occasional rain or wintry showers. Moderate or good, occasionally poor.

East Central Section

In north

Cyclonic gale 8 to storm 10, becoming westerly 7 to severe gale 9, backing southwesterly 4 or 5, then backing southerly or southeasterly 6 to gale 8 later, perhaps severe gale 9 later. High or very high, becoming very rough later. Rain or squally showers. Moderate or poor, occasionally good.

In south

Westerly 7 to severe gale 9, occasionally storm 10 at first in northwest, decreasing 5 or 6, then backing southerly or southeasterly 6 to gale 8 later. High, occasionally very high at first. Squally showers, rain later. Moderate or good, occasionally poor.

West Central Section

Northwesterly 7 to severe gale 9, occasionally storm 10 at first in northeast, decreasing 5 or 6, then backing southeasterly then becoming cyclonic later 7 to severe gale 9, then increasing storm 10 or violent storm 11 later south of 51 north. High or very high, becoming very rough for a time, then occasionally phenomenal later in south. Rain or squally showers, occasional snow later in north. Moderate or poor, occasionally good, then occasionally very poor later in northwest.

Denmark Strait

Cyclonic becoming easterly or northeasterly, 5 to 7, increasing gale 8 or severe gale 9 in west, then occasionally storm 10 later in far southwest. Rough or very rough, occasionally moderate in east, and then occasionally high later in far southwest. Occasional rain, sleet or snow. Moderate or poor, occasionally very poor. Occasional light icing near ice edge with temperatures ms02 to ms04.

North Iceland

In north

Southwesterly 5 or 6, occasionally 7 in north and east. Moderate or rough, occasionally very rough in far east. Occasional rain or drizzle. Moderate or good, occasionally poor. Occasional light icing near ice edge with temperatures ms02 to ms04.

In south

Southerly or southeasterly 5 or 6, increasing 7 or gale 8 later in south. Rough or very rough, occasionally high later in far south. Occasional rain or drizzle, fog patches in central areas. Moderate or good, occasionally poor, but occasionally very poor in central areas.

Norwegian Basin

Southwesterly 3 or 4 near northeastern norway coast, otherwise 5 to 7, increasing gale 8 at times in south and west. Moderate or rough near northeastern norway coast, otherwise rough or very rough. Showers. Mainly good.

Outlook for following 24 hours

Hurricane force winds expected in West Central Section, with storms in East Northern Section, East Central Section and Denmark Strait. Severe gales expected in Shannon, Rockall, Bailey, Faeroes, Southeast Iceland and West Northern Section, with gales in north Iceland and Norwegian Basin.

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

High seas forecast and storm warnings

High seas forecasts are issued twice daily at 0930 and 2130 GMT and cover the next 24 hours and outlooks for the following 24 hours.

The part of the North Atlantic known as Metarea I is divided into twelve sea areas, six of which are also in the Shipping forecast.

The high seas forecast contains a general synopsis and sea-area forecasts containg forecast wind direction and force, weather and visibility for the next 24 hours with an outlook for the following 24 hours.

 

In the UK, the Maritime & Coastguard Agency (MCA) is responsible for the provision of Maritime Safety Information (MSI) to ships at sea, which includes the broadcast of warnings and forecasts. The Met Office initiates warnings and prepares routine forecasts for dissemination on behalf of the MCA.

Caution: The internet is not part of the Maritime Safety Information system and should never be relied upon as the only means to obtain the latest forecast and warning information. Access to the service may be interrupted or delayed from time to time, updates may also be delayed. Please refer to GMDSS services, INMARSAT SafetyNET or international NAVTEX for the latest information. When using these web pages, always check that the page on your screen is not from your cache. Use the Refresh or Reload button if in any doubt.

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