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Weather Forecasts

Today
High
18°
Low
10°
80%
F4
Tomorrow
High
21°
Low
13°
0%
F2
Thu, 21 May
High
21°
Low
13°
0%
F2
Fri, 22 May
High
26°
Low
15°
0%
F3
Sat, 23 May
High
21°
Low
14°
20%
F3
Sun, 24 May
High
21°
Low
14°
15%
F2
Mon, 25 May
High
23°
Low
15°
15%
F2
Morning
Sunrise 04:21
Max
18°
80%
F4
Rather cloudy with rain or drizzle likely until mid-morning, some sunny periods developing later. Wind west to southwest moderate F4, occasionally fresh F5, mainly in Alderney.
UV 7
Afternoon
Sunset 19:54
Max
18°
10%
F3
Rather cloudy, becoming increasingly sunny through the afternoon. Wind westerly moderate F4, decreasing light F2 to 3 by evening, perhaps variable light F1 to 2 by dusk.
UV 7
Night
Waxing Crescent
Min
10°
5%
F2
Mainly clear, perhaps becoming cloudier and misty towards dawn. Wind southwest or variable light F1 to 3, becoming south by midnight.

Shipping Forecast

General Situation
At 18:00UTC low, 990mb, 200 miles west of Hebrides, expected to move north and fill by midday Thursday, with associated fronts affecting the area. Developing high expected 1028mb, West Germany, by same time.

13.7°C
Sea Temperature

Forecast from 00:00UTC Wednesday to 00:00UTC Thursday.
Wind
Southwest 4 to 5, locally 6 in the north of the area, generally becoming west to northwest 2 to 4 tomorrow afternoon, then south to southeast 1 to 3 in the evening.
Sea State
Rather rough to rough, in the northwest of the area, otherwise slight to moderate with a low swell, generally becoming smooth to slight with a moderate swell later.
Weather
Patchy rain and drizzle spreading eastwards and then clearing around midday.
Visibility
Good, locally moderate or poor at times.
Outlook from 00:00UTC Thursday to 00:00UTC Friday.
Wind
South to southeast 2 to 3 locally 4 at times, backing easterly by midday, increasing 3 to 4 locally 5 in the evening.
Sea State
Smooth to slight with a low swell.
Weather
A risk of mist or fog patches until mid-afternoon..
Visibility
Good, perhaps locally poor or very poor at times.

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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