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Mourne Mountains

Confidence

High for a milder spell until Friday night then much colder again, lower for details and for the timing of the change.

  • Thursday
  • Friday
  • Further outlook

Thursday 24 January 2019

Weather hazards

Poor visibility High likelihood Hide detail

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.

Gales Low likelihood Show detail

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.

Severe chill effect Low likelihood Show detail

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.

Headline

Cloudy and increasingly misty with outbreaks of rain and drizzle spreading from west, starting as sleet or wet snow on the tops. Becoming windy in the evening.

Weather at 700m

06:00 09:00 12:00 15:00 18:00 21:00
Partly cloudy night Light rain Light rain Drizzle Fog Fog
10% 50% 70% 50% 30% 20%
Chance of precipitation
700 800 1,400 1,900 2,000 1,900
Freezing level (m)
The level above which snow is expected to settle or the ground is expected to be frozen

Wind speed and direction (mph) By altitude above mean sea level

06:00 09:00 12:00 15:00 18:00 21:00
600m NW 21 28 NW 16 24 SW 8 11 SW 14 19 W 26 35 NW 27 37
300m NW 10 20 NW 7 15 SW 4 8 SW 7 11 W 13 22 NW 16 26
Valley NW 8 19 NW 5 15 SW 2 6 SW 4 8 NW 10 19 NW 12 22

Temperature (°C) By altitude above mean sea level

06:00 09:00 12:00 15:00 18:00 21:00
600m 1 1 2 3 6 6
300m 2 3 4 4 6 7
Valley 3 4 4 5 7 8

Feels like temperature (°C) By altitude above mean sea level

06:00 09:00 12:00 15:00 18:00 21:00
600m -6 -5 -2 -2 0 1
300m -2 0 2 2 2 4
Valley -1 2 3 3 4 5
Sunrise: 08:25   Sunset: 16:48
Moon phase: Waning gibbous

Weather

Cloudy and increasingly misty with outbreaks of rain and drizzle spreading from west, starting as sleet or wet snow on the tops above about 700m. A few heavier bursts possible in the morning then rain turning light and drizzly.

Chance of cloud-free mountain/hill tops at 700m

20% at first but less than 5% for most of the day as cloud becomes extensive at 300-600m with a few lower patches especially in the north and west.

Visibility

Mainly good but becoming poor during the day with significant navigational difficulties.

Meteorologist's view

Stronger winds in evening but rising temperatures.

Friday 25 January 2019

Sunrise: 08:23   Sunset: 16:50
Moon phase: Waning gibbous

Weather

Cloudy with a little light rain at times.

Maximum wind speed expected

West to southwest 35 gusts 50mph.

Chance of cloud-free mountain/hill tops at 700m

20% with persistent cloud at 500-800m and a few lower patches

Temperature

  • At 700m Plus 6 Celsius
  • Valley Plus 9 Celsius
  • Freezing level Above the summits

Visibility

Often good away from cloud but moderate in rain. Flat light due to the overcast conditions.

Saturday 26 January 2019

Sunrise: 08:22   Sunset: 16:52
Moon phase: Third quarter

Some heavier rain overnight then clearing to sunny intervals and showers these turning to snow as gale force northerly winds arrive. The chance of a longer spell of snow and even blizzard conditions but low confidence in detail.

Sunday 27 January 2019

Sunrise: 08:20   Sunset: 16:54
Moon phase: Third quarter

Very cold with sunny intervals and occasional snow showers. Gale force north to northwest winds and freezing at all levels.

Monday 28 January 2019

Sunrise: 08:19   Sunset: 16:56
Moon phase: Third quarter

Overnight, a band of snow then turning showery in the morning the showers turning to rain below 500m. Strong west to northwest winds.

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