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Snowdonia

Confidence

High confidence for the general weather story for the next few days. Some uncertainty in the timings of low cloud clearance on Tuesday and Wednesday.

  • This evening
  • Tuesday
  • Wednesday
  • Further outlook

Monday 15 October 2018

Sunrise: 07:42   Sunset: 18:21
Moon phase: Waxing crescent

Dry with clear spells at first but low cloud and patchy drizzle will arrive from the south through the evening. Light southerly winds becoming fresh over the summits.

Tuesday 16 October 2018

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.

Headline

Low cloud and patchy rain clearing for a time in the afternoon but returning later. Breezy.

Weather at 800m

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Mist Fog Fog Drizzle Mist Sunny intervals Light rain Drizzle
40% 40% 40% 60% 20% 10% 60% 80%
Chance of precipitation
2,600 2,600 2,500 2,200 2,000 3,000 2,700 2,300
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

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
900m SE 15 20 SE 17 21 S 21 26 S 25 32 SW 25 35 SW 29 39 SW 27 36 SW 22 31
600m SE 12 16 SE 12 16 S 15 20 S 18 25 SW 21 31 SW 21 31 S 19 28 SW 16 25
300m SE 8 15 SE 7 13 S 8 16 S 10 21 SW 13 27 SW 14 29 S 12 26 SW 10 22
Valley SE 8 16 SE 7 15 S 8 16 S 10 19 SW 13 27 SW 13 28 S 11 25 SW 9 21

Temperature (°C) By altitude above mean sea level

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
900m 6 7 7 8 7 7 7 7
600m 8 8 8 9 10 9 9 9
300m 9 10 10 11 12 12 11 11
Valley 10 11 11 12 14 13 12 12

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

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
900m 2 3 3 3 3 1 2 3
600m 5 5 5 6 6 5 5 6
300m 7 9 8 9 9 9 8 9
Valley 8 9 9 10 11 11 10 11
Sunrise: 07:44   Sunset: 18:19
Moon phase: First quarter

Weather

A dull and misty morning with patchy rain or drizzle. Becoming dry for a few hours in the afternoon with bright intervals. Thicker cloud and outbreaks of rain will return around early evening before clear spells arrive late in the evening as the rain moves away eastwards.

Chance of cloud-free mountain/hill tops at 800m

Almost zero chance in the morning with extensive cloud from low slopes upwards. Improving to 60% in the afternoon as cloud bases lift but most summits above 900m will remain in cloud. Almost zero chance from early evening with extensive cloud lowering to around 400 or 500m.

Visibility

Misty or foggy conditions at most levels through the morning and again in the evening. Visibility will become good in the afternoon under the cloud base for a few hours.

Meteorologist's view

Strong winds on the tops in the afternoon with isolated gusts of 50mph possible on high summits and ridges exposed to the southwesterly winds. Low cloud, damp conditions and winds combine to give a marked wind chill on the tops.

Ground conditions

No recent ground conditions report available.

Wednesday 17 October 2018

Sunrise: 07:46   Sunset: 18:17
Moon phase: First quarter

Weather

A mostly cloudy start with isolated showers but these will soon die away with increasing amounts of hazy sunshine coming through in the afternoon. A clear evening will follow and becoming cold with patchy fog and frost developing by midnight.

Maximum wind speed expected

Westerly 25-30mph in the early hours but soon decreasing to 10-15mph.

Chance of cloud-free mountain/hill tops at 800m

30% at first with patchy cloud above 500m but this soon lifting and breaking up with all summits expected to be clear in the afternoon.

Temperature

  • At 800m Plus 6 or 7 Celsius.
  • Valley Plus 6 rising to 13 Celsius, falling to Plus 1 Celsius through the evening.
  • Freezing level Above the summits.

Visibility

Under the cloud the air clarity will be very good with distant hills visible.

Thursday 18 October 2018

Sunrise: 07:47   Sunset: 18:15
Moon phase: First quarter

A cold and frosty start with a few fog patches in the valleys at first. Then a fine day with plenty of sunshine, light winds and excellent visibility.

Friday 19 October 2018

Sunrise: 07:49   Sunset: 18:13
Moon phase: First quarter

Mainly dry with bright or sunny intervals but patchy low cloud will affect the high summits. Southwesterly winds will freshen across the tops through the day. Feeling chilly at height.

Saturday 20 October 2018

Sunrise: 07:51   Sunset: 18:10
Moon phase: Waxing gibbous

Cloudy, mild and breezy conditions expected with patchy light rain or drizzle. Best of the dry conditions in the east.

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