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Mourne Mountains

Confidence

Generally high, but moderate for strongest winds on today and exact timing of any rain Thursday. Becoming moderate confidence over the weekend.

  • Wednesday
  • Thursday
  • Further outlook

Wednesday 26 September 2018

Weather hazards

Gales High likelihood Hide 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.

Poor visibility High likelihood Show 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.

Headline

Dull with hill fog. Severe gales across the summits at first this morning, easing in the afternoon.

Weather at 700m

06:00 09:00 12:00 15:00 18:00 21:00
Overcast Overcast Overcast Cloudy Cloudy Partly cloudy night
20% 20% 20% 20% 10% 00%
Chance of precipitation
3,600 3,300 3,000 2,800 2,800 2,900
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 W 43 58 W 34 46 W 28 38 W 25 34 SW 22 29 SW 22 30
300m SW 17 32 SW 16 27 W 16 26 W 15 24 SW 13 20 W 11 19
Valley W 16 35 W 13 27 W 12 25 W 11 23 SW 9 18 SW 7 17

Temperature (°C) By altitude above mean sea level

06:00 09:00 12:00 15:00 18:00 21:00
600m 11 12 12 13 12 12
300m 13 13 14 15 14 13
Valley 13 14 15 16 15 14

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

06:00 09:00 12:00 15:00 18:00 21:00
600m 6 7 8 9 9 8
300m 10 10 12 13 12 12
Valley 10 12 14 15 14 13
Sunrise: 07:16   Sunset: 19:14
Moon phase: Full

Weather

A rather dull, cloudy day. A little patchy light drizzle at times through this morning and early afternoon. Drier and brighter by the end of the day, some clear spells developing late evening. Summit gales this morning, easing in the afternoon.

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

Nil for much of the day with cloud extensive above 200-300m, lifting to 500m in the afternoon. Becoming 90% late evening as cloud breaks and lifts above the summits.

Visibility

Poor for much of the day. Improving to good at low levels through the afternoon, Very good late evening.

Meteorologist's view

Winds rapidly increase with height to give severe gales across summits. With extensive low cloud this will give challenging walking conditions in the morning. Very mild in sheltered glens with highs of 17 Celsius possible.

Thursday 27 September 2018

Sunrise: 07:18   Sunset: 19:11
Moon phase: Full

Weather

Strong summit winds but dry with patchy cloud through the early hours and the morning. Cloud thickens around midday, bringing some light rain. This clears to drier, fresher conditions around mid afternoon

Maximum wind speed expected

West-Southwest 30 gusting 40 mph, occasionally 50 mph over summits, becoming Northwest 25 gusting 30 mph around midday, then North 15-20 mph by evening.

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

Generally 60-70% with occasional cloud above 600-700m, becoming frequent and lowering to 500m for a time around midday. 100% from late afternoon with bases above the summits.

Temperature

  • At 700m 9 Celsius falling to 5 Celsius in the evening
  • Valley 7 Celsius rising to 17 Celsius
  • Freezing level Above the summits

Visibility

Mostly very good, brief deterioration around midday in low cloud.

Friday 28 September 2018

Sunrise: 07:20   Sunset: 19:09
Moon phase: Waning gibbous

Dry and bright with light winds, some bright or sunny spells. Freezing level above the summits.

Saturday 29 September 2018

Sunrise: 07:21   Sunset: 19:06
Moon phase: Waning gibbous

Remaining dry, cloud increasing through the day. Moderate westerly winds. Freezing level above the summits.

Sunday 30 September 2018

Sunrise: 07:23   Sunset: 19:04
Moon phase: Waning gibbous

Mostly dry with some bright or sunny spells. Freshening northwest winds becoming northerly later. Freezing level above the summits.

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