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Weather Forecasts

Today
High
20°
Low
17°
100%
F5
Tomorrow
High
22°
Low
16°
30%
F4
Mon, 31 Aug
High
20°
Low
15°
55%
F5
Tue, 1 Sep
High
21°
Low
15°
15%
F3
Wed, 2 Sep
High
21°
Low
16°
15%
F3
Thu, 3 Sep
High
21°
Low
16°
20%
F3
Fri, 4 Sep
High
22°
Low
16°
25%
F3
Morning
Sunrise 05:22
Max
20°
100%
F5
Cloudy with rain, heavy at times, clearing mid-morning. Wind south moderate F4 to fresh F5, gradually veering southwest, perhaps occasionally strong F6 with gusts to 40mph.
UV 5
Afternoon
Sunset 19:02
Max
20°
65%
F5
Sunny spells, becoming cloudier for a time with a couple of showers likely. Wind southwest fresh F5, occasionally strong F6 with gusts to 45mph, gradually veering west.
UV 5
Night
Full
Min
17°
25%
F5
Clear periods, with the slight chance of a shower. Wind west to southwest fresh F5, perhaps strong F6 at first, decreasing moderate F4 by dawn.

Shipping Forecast

General Situation
At 18:00UTC new low, expected 997mb just south of Ireland by dawn Saturday, with associated fronts affecting the area as it tracks eastward through the day.

19.6°C
Sea Temperature

Forecast from 00:00UTC Saturday to 00:00UTC Sunday.
Wind
Southwest 3 to 5, backing south 5 to 6 by soon after dawn, veering southwest to west 6 to 7 with gusts to 45kt by late afternoon, decreasing 5 to 6 again later.
Sea State
Slight to moderate, increasing rather rough to rough by mid-afternoon, perhaps occasionally very rough mid-Channel.
Weather
Rain and drizzle, locally heavy, spreading in from the west by dawn, clearing to scattered showers by mid-afternoon, becoming isolated by dusk.
Visibility
Good, becoming moderate to poor for a time.
Outlook from 00:00UTC Sunday to 00:00UTC Monday.
Wind
West 5 to 6, backing southwest 4 to 5 by dawn, further backing south by midday, then veering southwest 5 to 6 by dusk, perhaps locally 7 later.
Sea State
Moderate to rough, decreasing slight to moderate with a low swell by dawn, increasing moderate to rough again later.
Weather
Isolated showers, perhaps more widespread and locally heavy at times.
Visibility
Good, locally moderate, or perhaps 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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