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Saturday, 30 August 2014: dawn to dusk
Printable view Forecast issued: 1651 on Saturday, 30 August 2014
Rather cloudy through the early hours with outbreaks of rain possible, then a dry day with some sunny spells developing. Some rain possible later.
|Heavy snow||No Risk|
|Storm force winds||No Risk|
|Severe chill effect||No Risk|
|Persistent and extensive hill fog||High||Persistent down to 400m through the early hours, and again through the evening.|
|Heavy persistent rain||No Risk|
|Strong Sunlight||Medium||With moderate UV levels there is a risk of sunburn in sunny spells.|
|Dawn to 0900||0900 to 1200||1200 to 1500||1500 to dusk|
It will be cloudy through the early hours, with outbreaks of mainly light rain and extensive hill fog. The rain will quickly ease, and through the morning the cloud will lift and break to leave a dry day with some warm sunny spells. Through the afternoon cloud will gradually lower and thicken from the west, with patchy rain and drizzle along with extensive hill fog moving in later in the evening and overnight.
Generally good, but moderate to poor in outbreaks of rain and very poor in hill fog.
Occasional patches (persistent on Snowdon Range on the coastal hills) above 400-600m during the overnight period. Becoming less extensive with bases rising to perhaps 700-800m during the morning, but soon lowering and becoming widespread across the park. By evening, most hills above 300-400m will be shrouded in persistent hill fog making navigation difficult.
Northwesterly 30mph, backing Southwesterly 30-35 gusts 45pmh later
|Valleys||Plus 11 Celsius rising Plus 18 Celsius|
|900 m||Plus 9 Celsius|
|Freezing level||Above the summits|
It will be cloudy through much of the morning with outbreaks of rain and extensive hill fog. Late in the morning, rain will gradually ease and cloud will lift and breaks, to leave a mainly dry afternoon with some bright or sunny spells.
Moderate or poor at first in rain, becoming generally good by the afternoon. However, very poor in hill fog.
Extensive down to 400 metres through the morning, locally down to 100 metres on western facing slopes, severely affecting navigation. Through the morning, cloud will gradually lift and break, with just isolated patches down to 800 metres through the afternoon.
|Valleys||Plus 9 Celsius rising Plus 18 Celsius|
|900 m||Plus 9 Celsius|
|Freezing level||Above the summits.|
Probably dry on Tuesday, but with large uncertainties regarding cloud amounts. Some bright or sunny periods are likely and these may well be most prolonged in western areas of the park. Light to moderate easterly or southeasterly winds developing.
Any early mist or fog patches should quickly clear to leave a dry and fine day with a good deal of sunshine, particularly first thing. During the day, the cloud may well build, however this should stay largely above the summits. Winds are likely to be light and variable.
It will be another mainly dry day, with variable amount of cloud and bright or sunny spells developing after any early mist or fog patches lift. Winds will remain light and variable.
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