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Bordeaux Harbour
Bordeaux Harbour Picture by Peter Frankland
Today
High
9°
Low
4°
0%
F3
Tomorrow
High
12°
Low
11°
5%
F3
Thu, 18 Dec
High
13°
Low
8°
80%
F6
Fri, 19 Dec
High
12°
Low
7°
25%
F4
Sat, 20 Dec
High
11°
Low
7°
15%
F4
Sun, 21 Dec
High
10°
Low
6°
40%
F3
Mon, 22 Dec
High
11°
Low
6°
30%
F3
Morning, Today
High
9°
Mostly cloudy, but with some bright or sunny intervals. Perhaps the odd spot of light rain in Alderney.
0%
1
UV
F3
North to northwest light F3 in Guernsey, moderate F4 in Alderney.
Sunrise 08:01
Afternoon
High
9°
Sunny periods.
0%
1
UV
F3
North to northwest light F2 to 3.
Sunset 16:12
Night
Low
4°
Clear periods increasing.
5%
F2
North light F1 to 2, perhaps briefly light F3, becoming variable or southerly later.
Waning Crescent

Shipping Forecast

General Situation
At 18:00UTC high, 1030mb, Azores, extended a ridge across the area. Low, 944mb, mid-Atlantic, expected 953mb, south of Iceland by Thursday, with associated fronts affecting the area later.

11.2°C
Sea Temperature

Forecast from 00:00UTC Wednesday to 00:00UTC Thursday.
Wind
North to northwest 2 to 3, backing southwest to south 3 to 4 by dawn, increasing 5 to 6 by noon, locally 7 in the north and west of the area later.
Sea State
Slight, increasing rather rough to rough Wednesday afternoon, with a low to moderate swell throughout.
Weather
Rain spreading from the west from Wednesday afternoon.
Visibility
Very good or good, locally moderate.
Outlook from 00:00UTC Thursday to 00:00UTC Friday.
Wind
South 6 to 7, increasing 7 to 8 for a time Thursday afternoon, veering west to northwest 4 to 5 by midnight.
Sea State
Moderate with a low to moderate swell in the southeast. Rather rough to rough in the northwest, very rough for a time Thursday evening.
Weather
Occasional rain, locally heavy, clearing to isolated showers later.
Visibility
Good, occasionally moderate, locally poor.

Understanding the Forecast

The wind speed is given in the Beaufort Scale on an 8 point compass with a variability of +-45°. Terms commonly used in association with the wind and other parts of the forecast include:

Veering - a change of wind in the clockwise sense (up to 180°)
Backing – a change of wind in the anticlockwise sense (up to 180°)
At first – within the first 12 hours
Later – within the latter 12 hours
Occasional/occasionally – lasts less than half the time (location or time specific)
At times – non-persistent (lasts more than half the forecast period)
For a time – a transient state

Waves or sea state is the forecast of the mean of the largest 7% of combined wind and swell waves. Wind waves are locally produced waves; swell waves are produced by distant strong winds. Sea state descriptions equate to the following wave heights:

Description

Height

Smooth

< 0.5m

Slight

0.5 - 1.25m

Moderate

1.25 - 2.5m

Rough

2.5 - 4.0m

Very Rough

4.0 - 6.0m

High

6.0 - 9.0m

Very High

9.0 - 14.0m

Phenomenal

> 14m

Visibility measurements equate to the following distances in nautical miles and kilometers:

Description

Distance N.Mi

Distance Km

Good

> 5 n.mi

> 10 km

Moderate

2 - 5 n.mi

3.7 - 9 km

Poor

0.6 - 2 n.mi

1.0 - 3.7 km

Very Poor

< 0.6 n.mi

< 1000 m

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