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Autumn arrives early

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Derek Brockway Derek Brockway | 16:39 UK time, Monday, 5 September 2011

Sometimes September can bring us some lovely weather but not this week! We're in for a roller coaster ride, with a strong jet stream bringing spells of wet and windy weather in from the Atlantic.

Tonight we'll all see some rain. The rain will be heaviest on the Cambrian Mountains and in Snowdonia. 50 to 75 mm is possible - two to three inches. The rain will be accompanied by a strong to gale force south-westerly wind. The strongest winds will occur during the early hours of Tuesday with gusts 45 to 55 mph on exposed coasts and hills. Strong enough to bring down a few branches given the trees are still in full leaf.

Tomorrow morning the rain will clear to brighter skies and blustery showers. The strong winds will ease but it will remain windy.

The rest of the week will be very changeable. Sunny intervals and blustery showers on Wednesday. On Thursday, more rain and drizzle is expected with plenty of low cloud, mist and hill fog. Friday should be drier but windy and milder with top temperatures 17 to 21 celsius.

Yesterday morning Liz Prince spotted a few waterspouts over Cardigan Bay at Dyffryn Ardudwy in Gwynedd. These are fairly common during the autumn when cool, unstable air passes over the relatively warm sea.

Waterspouts over Cardigan Bay. Photo: Liz Prince

Waterspouts over Cardigan Bay. Photo: Liz Prince

Last year a waterspout was spotted of the Anglesey coast in November by the RAF.

If you see anything unusual in the sky let me know or send in a photo if you can. My email is dereksdiary@bbc.co.uk and don't forget you can follow me on my twitter page as well @derektheweather.

Watch out for the heavy rain and strong winds tonight!

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