Mountain weather

Mourne Mountains

Yellow warning

Yellow weather warning in force for Mourne Mountains

Mourne Mountains Mountain weather forecast table

Confidence

High for remaining cold, lower for snow shower detail especially from Monday.

Sunrise:
Sunset:

This evening forecast

Mainly cloudy with showers, these of snow above 300-400m. Strong cold northwesterly winds.

Sunrise:
Sunset:
Mountain hazards

Mountain weather hazards

Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.

hazard Severe Chill Effect
Wind significantly lowers the ‘feels-like’ temperature relative to the actual temperature, with even moderate winds significantly adding to the chilling effect. Strong winds can result in a severe and debilitating wind chill many degrees below the actual temperature. This effect will be enhanced in rain or wet snow. Without protection, prolonged exposure could result in frost nip or frostbite on exposed parts of the body and/or hypothermia.

hazard Poor Visibility
Poor visibility presents challenging route finding conditions. Visibility could be significantly less than 50 metres in all directions with few or no visual references, especially on featureless moors or plateaux. Distances become hard to judge and cliff or cornice edges can be difficult to recognise. These conditions require good navigational skills. There is a risk of white-out conditions when mist or fog is combined with extensive snow cover.

hazard Gales
Gale force winds (gusts over 50mph) make walking difficult and strenuous with a potential to be blown over by gusts. There is often a marked increase in winds through cols or on exposed ridges and summits. Distances can take longer to cover and compass bearings become harder to follow accurately.
hazard Strong Sunlight
Harmful UV levels from sunlight increase with altitude giving a greater risk of sunburn and eye damage, even on some overcast days. On breezy days, the cooling effect of wind on exposed skin may disguise any feeling of sunburn until it is too late. If there is snow cover, glare increases the effect of UV rays especially on the eyes. It is advisable to wear sun block, protective clothing such as a long-sleeved top and hat and have good quality eye protection.

Mountain weather forecast

Bitterly cold with some clear or sunny intervals and occasional snow showers. Strong northwesterly winds.

Time 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Weather
(at 700m)
Fog Heavy snow Light snow shower (night) Light snow shower (day) Light snow shower (day) Light snow shower (day) Heavy snow shower (night) Light snow shower (night)
Chance of precipitation
(at 700m)
50% 70% 40% 40% 30% 40% 40% 30%

Wind direction and speed (mph)
Altitude above mean sea level
Time 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
600m NW
33
NW
26
NW
30
NW
29
NW
28
NW
30
NW
28
NW
28
300m NW
17
NW
14
NW
16
NW
16
NW
17
NW
18
NW
17
NW
17
Valley NW
14
NW
11
NW
13
NW
13
NW
15
NW
15
NW
14
NW
13
Wind gust (mph)
Altitude above mean sea level
Time 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
600m 45 35 42 39 39 42 39 39
300m 30 25 29 28 29 31 29 28
Valley 29 24 27 26 28 29 27 26

Altitude above mean sea level
Time 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
600m
-1°
-1°
-2°
-3°
-2°
-2°
-3°
-3°
300m
-1°
-1°
-1°
Valley
Freezing Level
500m
400m
200m
100m
200m
200m
100m
100m

Altitude above mean sea level
Time 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
600m
-9°
-9°
-11°
-12°
-11°
-11°
-12°
-12°
300m
-4°
-5°
-6°
-7°
-6°
-6°
-7°
-7°
Valley
-2°
-3°
-4°
-5°
-4°
-4°
-5°
-5°

Additional weather information

Meteorologist's view

Tabular values look good though the higher summits will have lower temperatures and higher windspeeds than the 600m level values.

Weather

Cloudy in the early hours with frequent showers, some heavy with snow above 400m. Clearer by morning then the rest of the day seeing clear or sunny intervals and occasional snow showers, these falling to low levels and bringing fresh accumulations above about 200m. These showers could be briefly heavy, with drifting and blowing snow possible on the higher hilltops as accumulations start to build.

Chance of cloud-free hill tops

20% in early hours. 60% by day.

Low cloud and visibility

General cloud at 450-600m in early hours. The cloud more broken thereafter but occasionally overcast as showers move through. Bases will be hard to distinguish from the poor visibility caused by the snow showers as they move through but away from cloud and showers, good visibility.

Sunrise:
Sunset:

Mountain weather information

Weather

Rather cloudy but a few clear or sunny intervals. Also a few light snow showers.

Chance of cloud-free hill tops

40% - while cloud on low ground should be broken or well broken there could be some persistent cloud over the tops.

Maximum wind speed expected

Northwesterly 35 gusts 45mph.

Temperature

  • At 700m Minus 4 Celsius
  • Valley Plus 1 Celsius
  • Freezing level 200m

Low cloud and visibility

While cloud on low ground should be broken or well broken there could be some persistent cloud over the tops above 700m. Away from cloud and any snow showers visibility mostly good.

Mountain weather information

Sun 4 Jan

Sunrise:
Sunset:

A few sunny intervals in morning and early afternoon with the odd snow shower. Then more generally cloudy with more frequent snow showers though probably turning to rain or sleet below 200m. Fresh to strong northwest winds, some drifting.

Mon 5 Jan

Sunrise:
Sunset:

A dry day with sunny spells, freezing at all levels, lighter winds.

Tue 6 Jan

Sunrise:
Sunset:

Probably cloudier with the chance of some snow, with rain at lower levels.

Updated at:

Summit specific forecast

Mountain summit forecast map

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