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Snowdonia: latest pressure
Monday, 20 May 2013: dawn to dusk
Printable view Forecast issued: 1631 on Monday, 20 May 2013
Overview for Tuesday
Brightening up after a cloudy start.
| 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 | Patches of hill fog from 300m will lift and clear above the summits by lunch time. |
| Thunderstorms | No Risk | |
| Heavy persistent rain | No Risk | |
| Strong Sunlight | Medium | Prolonged cloud breaks in the afternoon will allow strong sunlight to come through. |
key to hazards and forecast content
| Dawn to 0900 | 0900 to 1200 | 1200 to 1500 | 1500 to dusk |
 Cloudy |
 Sunny intervals |
Sunny intervals |
 Sunny |
| 30% | 0% | 0% | 0% |
Detailed mountain weather forecast: Snowdonia
Tuesday
Weather
Starting cloudy with patchy drizzle. It will gradually turn drier and brighter up through the morning with good sunny spells, and some longer sunny intervals during the afternoon. Much of the cloud will dissipate later into the afternoon and evening.
Visibility
Good at first though very poor in any hill fog, becoming very good or excellent later.
Hill fog
Patchy hill fog down to 300 metres will readily lift and thin, rising higher than the summits before lunch time.
Maximum winds above 500m
Northerly 35 mph.
Temperature
| Valleys | Plus 8 rising to 18 Celsius. |
| 900 m | Plus 9 Celsius |
| Freezing level | Well above the summits. |
Wednesday
Weather
Similar to Tuesday - a cloudy start with perhaps some light drizzle. Turning drier and brighter with plenty of sunshine by lunchtime.
Visibility
Generally good or very good, though very poor in any hill fog.
Hill fog
Patches down to 400 metres at first, lifing above the summits by lunch time.
Maximum winds above 500m
Northwesterly, 30 mph
Temperature
| Valleys | Plus 8 rising to 17 Celsius |
| 900 m | Plus 5 Celsius |
| Freezing level | Above the summits. |
Outlook
Thursday
A pleasant day with plenty of sunshine, and some scattered cloud. no hill fog expected. Northerly wind increasing through the day and turning gusty. Freezing level 800 metres rising just above the summits by lunchtime.
Friday
A chilly start, but a pleasant day with plenty of sunshine, moderate northerly winds. No hill fog expected, freezing level above the surface.
Saturday
A pleasant day with plenty of sunshine, and only a few clouds, winds much lighter than Friday. No hill fog expected and freezing level above 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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