For the area bounded by latitude 50N, the French coast between Cap de la Hague and Île de Bréhat and longitude 3W.
Issued by the Jersey Meteorological Department at 4am Monday, 23 April 2018 for the period ending 7am Wednesday.
At 1am, a ridge of high pressure over Biscay maintained a westerly flow over the Channel.
Forecast from 7am Monday to 7am Tuesday.
Wind: Westerly 3 to 4, occasionally 5 Guernsey northwards, locally variable 1 to 3 near the Brittany coast in the afternoon, backing southwest in the evening and increasing 4 to 5 around midnight, perhaps 6 in the north of the area.
Sea state: Slight to moderate, becoming moderate to rather rough overnight.
Weather: Fair, becoming cloudy after midnight with the risk of mist patches and drizzle by morning.
Visibility: Good, becoming moderate to poor after midnight.
Swell: 2 to 4 feet.
Outlook from 7am Tuesday to 7am Wednesday.
Wind: Southwest 4 to 5, perhaps 6 in the north of the area at first, occasionally 3 Jersey southwards, increasing generally 4 to 6 late afternoon, veering west after midnight.
Sea state: Slight in the south to rather rough in the north with a low swell.
Weather: Occasional drizzle and patchy mist or fog spreading in from the west by late afternoon, clearing after midnight.
Visibility: Good becoming moderate, occasionally poor or very poor for a time.