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Snowdonia: latest pressure
Saturday, 21 November 2009: dawn to dusk
Overview for Saturday
A generally cloudy day with outbreaks of rain becoming heavier and more widespread during the morning along with strengthening winds.
| Hazards | Risk | Explanation |
|---|---|---|
| Blizzards | No Risk | |
| Heavy snow | No Risk | |
| Storm force winds | Low | A risk of gusts to around 70 mph in the afternoon. |
| Gales | High | Southerly winds strengthening through the morning. Gusts in excess of 50 mph likely by afternoon. |
| Severe chill effect | No Risk | |
| Persistent and extensive hill fog | High | Hill fog is likely to become extensive or blanket above around 500 metres by afternoon. |
| Thunderstorms | No Risk | |
| Heavy persistent rain | High | Rain is likely to be heavy and persistent through the afternoon. |
| Dawn to 0900 | 0900 to 1200 | 1200 to 1500 | 1500 to dusk |
 Light rain |
 Heavy Rain |
Heavy Rain |
Heavy Rain |
| 50% | 80% | 90% | 90% |
Detailed mountain weather forecast: Snowdonia
Saturday
Weather
A cloudy start with outbreaks of mostly light rain. The rain becoming heavier through the morning to leave a wet afternoon with hill fog becoming extensive. Southerly gales developing over the higher ground.
Visibility
Moderate or poor for much of the day in rain and very poor in hill fog.
Hill fog
Occasional above around 300 metres at first, especially southern upslopes. becoming widespread or blanket above around 500 metres by afternoon.
Maximum winds above 500m
Wind gusting 60 to 70 mph in the afternoon above around 600 metres.
Temperature
| Valleys | Plus 13 Celsius. |
| 900 m | Plus 8 Celsius. |
| Freezing level | Well above the summits. |
Sunday
Weather
A very windy day. Bright or sunny spells are likely at times with broken cloud but there will be occasional blustery showers, heavy and perhaps prolonged. Gale or perhaps severe gale force south or southwest winds. Occasional hill fog.
Visibility
Moderate or good but occasionally poor in heavier showers and very poor in hill fog.
Hill fog
Occasional above around 500 metres with patches at 300 metres in heavier showers.
Maximum winds above 500m
Wind gusts 70 to 80 mph possible at times above around 600 metres.
Temperature
| Valleys | Plus 10 to plus 12 Celsius. |
| 900 m | Plus 6 Celsius. |
| Freezing level | Well above the summits. |
Outlook
Monday
Unsettled with further showers or perhaps some longer spells of rain. Strong to gale force westerly winds. Occasional hill fog.
Tuesday
Continuing unsettled with further showers or perhaps some longer spells of rain. Strong to gale force westerly winds. Occasional hill fog.
Wednesday
Another unsettled and windy day with occasional blustery showers and occasional hill fog.
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