Mountain weather
Eryri / Snowdonia
Confidence
High for dry conditions tonight and the change to unsettled wet conditions during tomorrow morning. Moderate for extent of heavier outbreaks of rain through the Sunday and colder air Sunday night, allowing for patchy precipitation to turn to snow at height. Low for timing and phase of precipitation Monday night which may produce blizzard conditions and accumulating snow at height.
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This eveningSunrise:Sunset:
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Sun 15 NovSunrise:Sunset:
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Mon 16 NovSunrise:Sunset:
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Further outlook
This evening forecast
Dry with variable cloud producing patchy low cloud and transient hill fog at the summits. Sub-zero temperatures at height with a severe wind chill above 600 M.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Poor Visibility
Severe Chill Effect
Heavy Persistent Rain
Mountain weather forecast
*
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
Weather
(at 800m)
|
Weather symbols |  |
 |
|
 |
|
 |
|
 |
|
Chance of
precipitation (at 800m)
|
Chance of precipitation |
10%
|
20%
|
20%
|
60%
|
70%
|
90%
|
90%
|
60%
|
Wind direction and speed
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | S 39mph knots
S
39mph |
S 29mph knots
S
29mph |
S 19mph knots
S
19mph |
SE 16mph knots
SE
16mph |
S 11mph knots
S
11mph |
NW 16mph knots
NW
16mph |
NW 30mph knots
NW
30mph |
NW 32mph knots
NW
32mph |
|
600m
|
600m | S 25mph knots
S
25mph |
S 20mph knots
S
20mph |
S 15mph knots
S
15mph |
SE 12mph knots
SE
12mph |
S 8mph knots
S
8mph |
W 10mph knots
W
10mph |
NW 19mph knots
NW
19mph |
NW 21mph knots
NW
21mph |
|
300m
|
300m | S 16mph knots
S
16mph |
S 12mph knots
S
12mph |
S 11mph knots
S
11mph |
SE 7mph knots
SE
7mph |
SE 6mph knots
SE
6mph |
W 7mph knots
W
7mph |
NW 12mph knots
NW
12mph |
NW 15mph knots
NW
15mph |
|
Valley
|
Valley | S 15mph knots
S
15mph |
S 11mph knots
S
11mph |
S 11mph knots
S
11mph |
S 7mph knots
S
7mph |
SE 6mph knots
SE
6mph |
W 6mph knots
W
6mph |
NW 13mph knots
NW
13mph |
NW 15mph knots
NW
15mph |
Wind gust
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | 47mph | 37mph | 26mph | 20mph | 14mph | 20mph | 37mph | 40mph |
|
600m
|
600m | 34mph | 29mph | 22mph | 17mph | 11mph | 14mph | 26mph | 29mph |
|
300m
|
300m | 32mph | 25mph | 21mph | 15mph | 10mph | 12mph | 24mph | 27mph |
|
Valley
|
Valley | 31mph | 24mph | 22mph | 16mph | 10mph | 12mph | 24mph | 28mph |
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
900m
|
900m | ||||||||
|
600m
|
600m | ||||||||
|
300m
|
300m | ||||||||
|
Valley
|
Valley | ||||||||
| Freezing Level | Freezing Level |
1000m
|
1100m
|
1500m
|
1600m
|
1600m
|
1500m
|
1100m
|
900m
|
Additional weather information
Meteorologist's view
Poor walking conditions with widespread rain (locally heavy), along with low cloud and hill fog making visibility difficult during the afternoon. Waterproofs may become drenched with the risk of a few watercourses becoming swollen during the evening. Towards midnight the freezing level falling with any patches of precipitation turning wintry at height. NW'ly winds strengthening during the evening adding to the severe wind chill as the summits fall below freezing.
Weather
Dry conditions through the early morning with patches of cloud low enough to shroud hills. Rain then gradually spreading from the SW and locally turning heavy from midday with low cloud becoming extensive generating widespread hill fog. Wet conditions with poor visibility lasting much of the day with only a few breaks at times. During the evening rain turning more showery, with colder air from the NW producing snow showers over 800 M. Clear spells emerging. SE'ly winds veering and strengthening to NW'ly gusting 30 mph at height.
Chance of cloud-free hill tops
Initially 50% decreasing to 10% under extensive cloud and rain. 50% later towards midnight.
Low cloud and visibility
Patchy summit cloud initially before low cloud and hill fog becomes more extensive above 400 M during the afternoon. Visibility turning poor to very poor under heavy rain and low cloud. Clearer spells towards midnight.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Weather
Cold conditions through the morning with clear spells and the odd light shower, wintry over high ground. A severe wind chill at height with a frost not just towards summits. Largely dry through Monday afternoon with increasing medium to high level cloud. Heavy rain then spreading from the SW producing the risk of a period of accumulating snow and possible freezing rain above 250 M. Snow may then turn to a period of rain and sleet with extensive low cloud, hill fog and poor visibility.
Chance of cloud-free hill tops
80% through the morning then 10% during the evening into overnight.
Maximum wind speed expected
Winds strengthening to a ESE with gusts of 40 mph at height during evening with a severe wind chill.
Temperature
- At 800m MAX MINUS 1 C with a MINUS 8 C feel like.
- Valley MAX 6 C with a 3 C feel like.
- Freezing level 500 M rising to 1500 M overnight.
Low cloud and visibility
A few patches of cloud early morning and associated with any passing showers then excellent visibility before evening rain and snow produces poor to very poor visibility along with hill fog. Blizzard conditions possible for a time over high ground.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Tue 17 Nov
Unsettled wet conditions on Tuesday with overnight rain clearing north and a legacy of low cloud and hill fog during the morning. Any accumulations of snows likely to start thawing. Brighter spells at times during the afternoon however frequent heavy and locally thundery blustery showers spread from the west. Freezing level around 1500 M.
Wed 18 Nov
A continuation of unsettled showery conditions on Wednesday with heavy and locally thundery showers merging to spells of rain. Cloud low enough at times for hill fog. Freezing level around 1500 M but likely to fall overnight to 800 M turning precipitation wintry at height.
Thu 19 Nov
Legacy of patchy rain clearing during early morning with clearer and drier conditions developing during the day. An overnight frost likely with a severe wind chill at height. Freezing level down to 600 M.
Summit specific forecast
Mountain summits
Other points of interest
Cluster of multiple stations