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Weather Forecasts

Today
High
12°
Low
8°
35%
F4
Tomorrow
High
11°
Low
7°
20%
F3
Mon, 9 Feb
High
10°
Low
9°
65%
F5
Tue, 10 Feb
High
11°
Low
9°
50%
F4
Wed, 11 Feb
High
11°
Low
8°
65%
F5
Thu, 12 Feb
High
10°
Low
5°
50%
F4
Fri, 13 Feb
High
7°
Low
4°
40%
F5
Morning
Sunrise 07:35
Max
12°
35%
F4
Rather cloudy at first and the chance of showers. Sunny periods developing. Wind south to southwest moderate F4 to fresh F5.
UV 2
Afternoon
Sunset 17:16
Max
12°
25%
F4
Sunny periods and the chance of a shower. Wind south to southwest moderate F4, decreasing light F3.
UV 2
Night
Last Quarter
Min
8°
30%
F3
Some clear periods at first, otherwise rather cloudy, perhaps the odd shower. Wind south to southwest light F3, perhaps occasionally moderate F4.

Shipping Forecast

General Situation
At 18:00UTC low, 991mb, Irish Sea, expected to move north and lose its identity by midday Sunday. Low 989mb, 200 miles west of Ireland, moving northeast to be 996mb 50 miles north of Ireland by the same time.

Forecast from 00:00UTC Sunday to 00:00UTC Monday.
Wind
South to southwest 3 to 4, backing south to southeast to the south of Jersey for at time in the morning, perhaps locally 5 near showers by evening.
Sea State
Slight, with a low to moderate swell throughout.
Weather
Isolated showers. Mist or fog patches developing near the French coast by morning, drifting east and north for a time. Showers more frequent Sunday evening.
Visibility
Good, occasionally moderate, locally poor or very poor.
Outlook from 00:00UTC Monday to 00:00UTC Tuesday.
Wind
Southerly 4 to 5, backing south to southeast by Monday morning, increasing 5 to 6 by afternoon, veering southwest 4 to 5 Monday evening.
Sea State
Moderate with swell, becoming rather rough, perhaps rough mid Channel.
Weather
Isolated showers then rain later.
Visibility
Good, occasionally moderate and poor later.

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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