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 4pm Friday, 20 September 2019 for the period ending 7pm Sunday.
At 1 p.m., high 1029mb over Germany, expected to drift east and decline, with a strong easterly airflow through the Channel. At the same time, a complex of slow moving lows, lay 500 miles west of Britain, with fronts slowly approaching the Channel.
Forecast from 7pm Friday to 7pm Saturday.
Wind: East 4 to 6, locally 7 mid-Channel, veering SE and decreasing 4 to 5 by midnight, further decreasing 3 to 4 around noon tomorrow perhaps southerly 2 in the south of the area later.
Sea state: Slight in the south, rather rough decreasing moderate overnight in the north, then slight in all parts tomorrow afternoon.
Weather: Fine, becoming cloudier overnight with the slight risk of a shower from around dawn. Slight risk of thunder by tomorrow evening. Mainly in the northwest of the area.
Visibility: Good, perhaps moderate in any thundery showers.
Swell: 2 feet developing.
Outlook from 7pm Saturday to 7pm Sunday.
Wind: Southeast 3 to 4, perhaps locally 5, veering south to southwest by Sunday morning, then southwest to west on Sunday afternoon.
Sea state: Slight with a low swell.
Weather: Isolated showers with a slight risk of thunder at first. Rain, locally heavy, spreading in from the west towards dawn Sunday, clearing to isolated showers by noon.
Visibility: Good, but moderate in showers and rain, locally poor for a time on Sunday morning.