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Weather Forecasts

Today
High
14°
Low
9°
35%
F3
Tomorrow
High
15°
Low
12°
65%
F4
Mon, 18 May
High
15°
Low
12°
65%
F4
Tue, 19 May
High
17°
Low
12°
60%
F5
Wed, 20 May
High
18°
Low
10°
30%
F4
Thu, 21 May
High
22°
Low
13°
0%
F3
Fri, 22 May
High
23°
Low
13°
0%
F3
Morning
Sunrise 04:25
Max
14°
35%
F3
Some bright or sunny spells, but mostly cloudy with the chance of showers. Wind west to northwest light F3 to moderate F4.
UV 6
Afternoon
Sunset 19:50
Max
14°
35%
F4
Some brightness at times, but mostly cloudy with the odd shower possible, especially later. Wind west moderate F4.
UV 6
Night
New
Min
9°
80%
F3
Mainly cloudy with showers. Wind west light F3 to moderate F4, backing southwest.

Shipping Forecast

General Situation
At 18:00UTC low, 991mb, east of Greenland, slow moving and filling by midday Sunday. Low, 985mb, mid-Atlantic, expected 984mb, 500 miles northwest of Ireland by same time.

13.4°C
Sea Temperature

Forecast from 00:00UTC Sunday to 00:00UTC Monday.
Wind
Northwest to west 3 to 4, backing west 4 to 5 later.
Sea State
Slight to moderate with a low swell.
Weather
Isolated showers, perhaps locally heavy.
Visibility
Good or very good, locally moderate or perhaps poor at times.
Outlook from 00:00UTC Monday to 00:00UTC Tuesday.
Wind
West to southwest 4 to 5, occasionally 3, backing south 3 to 4 for a time.
Sea State
Slight to moderate with a low swell.
Weather
Patchy rain or showers spreading in from the northwest overnight.
Visibility
Good or very good, locally moderate or perhaps 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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