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Snowdonia: latest pressure
Saturday, 25 May 2013: dawn to dusk
Printable view Forecast issued: 1734 on Saturday, 25 May 2013
Overview for Sunday
Sunday will be another fine and dry day with some good spells of sunshine developing, particularly through the afternoon. However, some low cloud will affect western hills through the morning.
| Hazards | Risk | Explanation |
|---|---|---|
| Blizzards | No Risk | |
| Heavy snow | No Risk | |
| Storm force winds | No Risk | |
| Gales | No Risk | |
| Severe chill effect | No Risk | |
| Persistent and extensive hill fog | Low | Some low cloud will shroud some hills through the early morning period, particularly coastal hills |
| Thunderstorms | No Risk | |
| Heavy persistent rain | No Risk | |
| Strong Sunlight | Medium | Given the prolonged sunny periods and the time of year, risk of sunburn during the day. |
key to hazards and forecast content
| Dawn to 0900 | 0900 to 1200 | 1200 to 1500 | 1500 to dusk |
 Cloudy |
 Sunny intervals |
Sunny intervals |
 Sunny |
| 0% | 0% | 0% | 0% |
Detailed mountain weather forecast: Snowdonia
Sunday
Weather
Early valley mist and low cloud will clear to leave another dry and bright day with some sunny spells developing, especially across eastern hills. However, always more in the way of cloud across western hills through the morning.
Visibility
Generally very good or excellent, but poor in any mist and very poor in hill fog through the morning.
Hill fog
Low cloud will affect some western hills through the morning resulting in extensive hill fog, especially on coastal hills. However, this should lift and disperse through the afternoon, with summits becoming cloud free.
Maximum winds above 500m
Southwesterly 10-20mph.
Temperature
| Valleys | Plus 1 becoming 16 Celsius |
| 900 m | Plus 4 becoming 6 Celsius |
| Freezing level | Above summits, but frosty through the valleys around dawn. |
Monday
Weather
A band of rain arriving from the west during the morning, this may well be heavy at times and continue into the early afternoon before clearing to brighter, but showery, conditions. Winds will increase markedly with height with widespread upland gales developing for a time, before easing through the afternoon and evening.
Visibility
Generally poor through the morning and very poor in the hill fog throughout. Becoming good or very good through later in the afternoon.
Hill fog
Extensive hill fog will shroud the hills for much of the morning and early afternoon period. Lowest bases will be across southwestern hills at 300-500m. The highest bases will be across northeastern hills at 500-800m. Bases will lift through the afternoon as the rain clears to brighter, but showery conditions.
Maximum winds above 500m
Marked increase in speeds with height. South or southwesterly 35-45mph, gusts to 60mph across highest summits and ridges.
Temperature
| Valleys | Plus 7 becoming 14 Celsius |
| 900 m | Plus 2 becoming 4 Celsius |
| Freezing level | Above summits. |
Outlook
Tuesday
Remaining unsettled through Tuesday with sunshine and showers, some of which may well be on the heavy side with the risk of hail and thunder. Moderate southwesterly winds. Freezing level above the summits.
Wednesday
The showery theme will continue as low pressure dominates the weather pattern. Some of the showers will again be on the heavy side with the risk of the odd rumble of thunder. Fresh, to occasionally strong, north or northwesterly winds. Freezing level above the summits.
Thursday
Thursday may well be a drier and brighter day across all ranges. However, some light rain or drizzle may affect northwestern hills at times. Freezing level above the summits. Moderate to fresh northwesterly winds.
Observations
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The Enhanced Mountain forecast for Snowdonia has been discontinued. All forecast information for these locations can be found in the standard Mountain forecast above.
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