Snowdonia National Park

Includes all summits in the the northern half of Wales from Plynlimon northwards.

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Viewing Forecast For

Snowdonia National Park
Saturday 29th February 2020
Last updated Saturday 29th February 2020 at 7:34 AM

Summary for all mountain areas

A complex weather situation. An early zone of rain and upland snow clears away eastwards, with cloud breaking widely. Then another area of heavy snow spreads in from the west into the afternoon. Wind speeds varied; least windy northern Scotland, but increasingly stormy across hills of England & Wales.

Headline for Snowdonia National Park

Upland gales increasingly stormy. Snow & hail showers, may set in.

How windy? (On the summits)

Southwesterly; 30-40mph morning, but strengthening, to 50-60mph by midday or soon after, and abruptly 70-80mph across higher tops during afternoon.

Effect of the wind on you?

Generally arduous conditions on the hills. Deteriorating to make any mobility difficult on higher terrain during afternoon. Severe wind chill.

How Wet?

Snow showers, risk setting in for a time.

Overnight snow & rain will clear by dawn. A few snow showers, but mid afternoon abruptly constant snow and whiteout for two hours or so. Perhaps briefly hail and chance isolated thunder. Rain only in and just above valleys. Very wet underfoot lower slopes following previous heavy rain; streams in spate or flood.

Cloud on the hills?

Forming widely in snow

Patches at dawn will largely clear, with most summits cloud free for several hours. However, anticipate abrupt deterioration from west middle of day as in precipitation fog quickly shrouds the hills.

Chance of cloud free summits?

30%

Sunshine and air clarity?

Patches of sun morning, particularly east Wales. Hazy before visibility becoming very poor or appalling in snow.

How Cold? (at 900m)

-3 or -4C. Where exposed to strongest winds, feeling close to -20C by afternoon on high tops.

Freezing Level

600m, temporarily into afternoon lowering to 400m.

Viewing Forecast For

Snowdonia National Park
Sunday 1st March 2020
Last updated Saturday 29th February 2020 at 7:34 AM

How windy? (On the summits)

West or southwesterly 40 to 50mph; perhaps lower speeds for a time.

Effect of the wind on you?

Risk of difficult conditions for walking; severe wind chill high tops.

How Wet?

Snow showers

Snow and hail showers sometimes frequent and heavy. Small risk thunder.

Cloud on the hills?

Extensive on higher areas

Cloud base will vary, though higher tops only fleetingly if at all clearing; generally between showers cloud base 900m, but patches near precipitation above about 450m.

Chance of cloud free summits?

30%

Sunshine and air clarity?

Bursts of sunshine and very good or excellent visibility - although temporarily very poor visibility in snow.

How Cold? (at 900m)

-2C

Freezing Level

600 to 700m, lowest early in day.

Viewing Forecast For

Snowdonia National Park
Monday 2nd March 2020
Last updated Saturday 29th February 2020 at 7:34 AM

How windy? (On the summits)

Westerly, speeds varied (detail uncertain), occasional lulls, but often 25-30mph, risk at times 45mph.

Effect of the wind on you?

Expect buffeting and significant wind chill across the hills; conditions may vary through the day.

How Wet?

Showers, snow on hills

A few showers spreading from west, snow or hail flurries on the hills, mostly rain lower slopes. May become frequent for a few hours western areas.

Cloud on the hills?

Often capping higher slopes

Cloud bases varied depending on extent of precipitation. Sometimes shrouding the hills for periods above 600-800m, lowest near west coast, and may often cover high tops. Breaks best toward east.

Chance of cloud free summits?

30%

Sunshine and air clarity?

Occasional sun, most common east Wales. Visibility often very good, but at times very poor if in snow.

How Cold? (at 900m)

-2C

Freezing Level

500-600m, perhaps lower from dawn; may rise slightly further in afternoon.

Planning Outlook

Remaining cold into the start of March, with westerly winds generally prevailing. Scottish mountains staying sub-zero much of the time, whilst England & Wales will see periods of freeze and thaw, and snow more often confined to higher slopes. Precipitation remaining focused on western mountains. Lower terrain staying very wet underfoot. Wind speeds varied, occasional lulls, but also gales at times. Some indications of higher pressure into the second week of March.