Saturday
Weather
It will be a cloudy start to the day with some pockets of drizzle. It will stay rather cloudy throughout the morning, although some brighter breaks are possible across northern and eastern hills. A band of heavy showers will push across all parts of Snowdonia from the southwest during the afternoon bringing the risk of lightning. This will be replaced by rather cloudy weather with a scattering of showers, although becoming more frequent through the evening. Remaining windy, but it will remain mild for the time of year.
Visibility
Generally good or very good below the cloud bases, but moderate to poor in the showers and very poor in the hill fog.
Hill fog
Extensive hill fog across southern and western hills at first, with bases 400-600m. Across more sheltered northern and eastern hills bases will be broken at around 600-900m. By the early part of the afternoon, the bases will lift to 600-800m in the west, but patches down to 500m in the band of showers. However, northern and eastern hills may become clear of cloud for a time during the early afternoon period, however patches will reform down to 600m near, and after, the shower band in the afternoon.
Maximum winds above 500m
South-westerly 25-35mph, perhaps 40mph across highest summits and ridges.
Temperature
Valleys Plus 11 becoming 17 Celsius
900 m Plus 10 Celsius
Freezing level Above the summits.
http://www.metoffice.gov.uk/loutdoor/mountainsafety/snowdonia/snowdonia_latest_pressure.html
