Snowdonia mountain area forecast
Sunday, 22 November 2009: dawn to dusk
Forecast issued: 1652 on Saturday, 21 November 2009
Latest pressure
Updated: 2122 on Sat 21 Nov 2009
Digital Map Data:
© Collins Bartholomew Ltd (2006)
Overview for Sunday
A brighter day, but very windy with strong to gale force winds throughout. Also, frequent showers, some heavy with the risk of hail.
| Hazards | Risk | Explanation |
|---|---|---|
| Blizzards | No Risk | |
| Heavy snow | No Risk | |
| Storm force winds | High | Southwesterly, gusts up to 60 mph, with the risk of 70 mph over 700m |
| Gales | High | Southwesterly, gusts up to 60 mph likely, particularly on exposed ridges. |
| Severe chill effect | High | In showers and especially above 700m. |
| Persistent and extensive hill fog | Low | Occasional patches of hill fog in and around showers above 600m. |
| Thunderstorms | Low | Low risk of thunder and lightning in any of the heavier showers. |
| Heavy persistent rain | Low | Low risk of heavy showers merging together to form longer periods of rain during the afternoon. |
| Dawn to 0900 | 0900 to 1200 | 1200 to 1500 | 1500 to dusk |
 Heavy rain showers |
Heavy rain showers |
Heavy rain showers |
Heavy rain showers |
| 60% | 60% | 70% | 90% |
Detailed mountain weather forecast: Snowdonia
Sunday
Weather
Brighter but very windy with strong to gale-force winds together with frequent showers, some heavy with the risk of hail. Largely cloudy but some sunshine can be expected in between the showers.
Visibility
Generally moderate to good, but poor in heavy showers and very poor in any hill fog.
Hill fog
Occasional patches above around 700 metres.
Maximum winds above 500m
Southwest 45 to 55 mph gusting 60-70 mph.
Temperature
| Valleys | Plus 9 Celsius. |
| 900 m | Plus 2 Celsius. |
| Freezing level | 1100m, just above the Snowdon summit. |
Monday
Weather
Another windy day with strong westerly winds, but brighter with more in the way of sunny spells in between occasional, mainly light showers. Showers easing during the afternoon period allowing more in the way of sunshine.
Visibility
Moderate or good but occasionally poor in showers and very poor in any hill fog.
Hill fog
Occasional patches above 600 metres.
Maximum winds above 500m
Westerly 30-40mph gusting 55mph.
Temperature
| Valleys | Plus 8 Celsius. |
| 900 m | Plus 2 Celsius. |
| Freezing level | Above the summits. |
Outlook
Tuesday
Remaining unsettled with more strong to gale-force southwesterly winds, and some spells of persistent, heavy rain. Periods of hill fog are likely.
Wednesday
Very windy with strong to gale-force west or southwesterly winds, and further heavy showers throughout the day. Occasional patches of hill fog.
Thursday
Winds easing but still remaining unsettled with scattered showers and variable amounts of cloud. Occasional hill fog.
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