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Snowdonia National Park
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Viewing forecast for Sunday, 19th May, 2013
Forecast last reviewed on Saturday, 18/05/13 at 16:12
Summary for all mountain areas
Warm, moist air covers all ranges in a gentle northeasterly airflow with some early morning low cloud and local fine drizzle. Cloud extensively dispersing particularly across western ranges. Isolated thundery afternoon showers mainly England and Wales.
Headline, Snowdonia National Park
Warm, mostly bright with fairly light winds. Small thundery shower risk.
Direction varying but mostly from an easterly point, 15mph or less.
Effect Of Wind?
Risk thunderstorms developing
Mostly dry but low risk of a shower or thunderstorm developing in the afternoon.
Cloud on the hills?
Soon cloud free. Risk later deteriorating.
Areas of very low cloud or fog at first, particularly eastern hills, will soon clear. Summits then cloud free for much of the day but small risk of cloud developing, mainly later in afternoon near any showers.
Chance of cloud free Summits?
Sunshine and air clarity?
Unbroken sunshine developing but may fade later in afternoon. Visibility hazy, and very poor at first where in fog.
How Cold? (at 900m)
8 to 10C
Planning Outlook for all mountain areas from Monday, 20th May, 2013
Warm with continued rapid melting of remaining snow at higher levels on Monday and for most of Tuesday with a good deal of sunshine and very little precipitation. Gradually turning cooler and cloudier from the northwest from late Tuesday. Probably only small amounts of rain and winds generally remaining fairly light. A divergence of views towards next weekend with some models pointing to high pressure persisting just to the west of Ireland bringing mainly dry weather and others pointing to more unsettled weather slowly extending southwards at least across northern ranges.