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Snowdonia: latest wind
Monday, 20 May 2013: dawn to dusk
Printable view Forecast issued: 0512 on Monday, 20 May 2013
Overview for Monday
Quite cloudy with hill fog likely in places initially, but cloud should lift and break up later with some sunny spells.
| 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 | Medium | Periods of hill fog above 300 metres are likely during the morning, breaking up later. |
| Thunderstorms | No Risk | |
| Heavy persistent rain | No Risk | |
| Strong Sunlight | Medium | Occasional lengthy cloud breaks may develop later with some strong sunshine coming through. |
key to hazards and forecast content
| Dawn to 0900 | 0900 to 1200 | 1200 to 1500 | 1500 to dusk |
 Cloudy |
Cloudy |
 Sunny intervals |
Sunny intervals |
| 30% | 20% | 0% | 0% |
Detailed mountain weather forecast: Snowdonia
Monday
Weather
Generally a dry and settled, warm day, but often cloudy. Most of this cloud will be during the morning, enveloping peaks and high ridges, with perhaps the odd light drizzly shower of rain. Becoming brighter and drier during the afternoon with cloud lifting and breaking somewhat, allowing some warm sunshine to break through. Winds should be light and north or northwesterly.
Visibility
Moderate to start, but poor visibility cross-peak with low cloud. Generally improving during the afternoon especially as cloud lifts and breaks.
Hill fog
Periods of hill fog above 300 metres during the morning, especially against north-facing slopes. This will lift somewhat during the afternoon to about the level of the peaks.
Maximum winds above 500m
North or northwesterly 20 mph.
Temperature
| Valleys | Plus 7 Celsius becoming 18 degrees Celsius during afternoon. |
| 900 m | Plus 8 Celsius becoming 11 degrees Celsius. |
| Freezing level | Well above the summits. |
Tuesday
Weather
A rather cloudy and fairly mild morning again with some spots of light rain, and some hill fog capping the peaks. The cloud should thin and break again during the afternoon, becoming largely dry, and gradually becoming a little fresher as winds strengthen from the northwest.
Visibility
Generally very good once low cloud has lifted. Very poor in any hill fog.
Hill fog
Periods of hill fog probable during the morning above 500 metres, slowly lifting with only patches over the higher summits during the afternoon.
Maximum winds above 500m
Northerly 30 mph.
Temperature
| Valleys | Plus 11 Celsius becoming 16 Celsius during the afternoon. |
| 900 m | Plus 11 Celsius becoming 8 Celsius during the afternoon. |
| Freezing level | Well above the summits. |
Outlook
Wednesday
Some morning cloud and light outbreaks of rain possible, but becoming less cloudy and fresher during the afternoon with a strengthening northwesterly wind. Freezing levels should remain above the summits, but cooling-off quite markedly over high peaks and ridges later in the afternoon as colder air arrives.
Thursday
Cool, dry and fine with sunny spells and gusty north or northwesterly winds through the day, and freezing levels just above the summits.
Friday
Similar to Thursday, largely dry with sunny spells and perhaps some occasional cloud. Winds will be moderate and northerly, with freezing levels just above the summits.
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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