Stormy Wednesday for Cornwall?

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Stormy Wednesday for Cornwall?

Postby Graham Easterling » 2012 Apr 15, 18:43

The low that is set to wind itself up over western Ireland & track SE is a perfect setup for a decent NW gale on the tip of Cornwall. Most of our gales in recent years seem to have come from this sort of setup. The forecasts tend to overestimate the wind speed just ahead of a low such as this, but understate the following NWesterly (Possibly due to insufficient allowance for the shape of the peninsula, and the wind funnelling around Land's End?) The wind speeds typically decrease rapidly as you head eastwards up the County towards England.

Also, because the direction/speed of movement of the low, it's likely to generate a fairly exceptional swell for April. 20'+ forecast for Sennen (near Land's End) http://magicseaweed.com/Sennen-Surf-Report/4/ This is a more certain prediction than the wind speed, as if the track of the low is just 50 miles further west we'll miss the NW gale, but the swell will be much the same.

Still, it's been a lovely day today. Prolonged periods of strong sunshine have made it feel a good deal warmer than the 11.4C it actually reached, and the visibility has been excellent once again, as it has been much of the last week. http://www.cornwallcam.co.uk/recently.htm
Graham

Penzance Weather Station
Grid Ref:
SW464231 - Post Code: TR18 4TP
19m AMSL - Aspect SSE
In a SE - NW orientated valley

23 Years of Penzance Weather Records : http://penzanceweather.atspace.com/weather.html
Graham Easterling
 
Posts: 316
Joined: 2011 Nov 30, 20:29
Location: Penzance, Cornwall

Re: Stormy Wednesday for Cornwall?

Postby Graham Easterling » 2012 Apr 16, 18:28

The forecast gale, and more significantly the likely huge swell which will be generated south west of Ireland, is now being taken quite seriously down here. All the boats pulled as far up as possible. http://www.sennen-cove.com/today2.htm. Probably (& hopefully!) nothing like March '08. http://www.sennen-cove.com/ts06.htm and http://www.sennen-cove.com/ts1.htm , which was not a disimilar situation, low tracking SE just to the NW of Cornwall. (plenty of Youtube videos taken that day)

Update 16:00 on 17th. Already a gust to 60mph at Land's End with the mean speed reaching F8 for a time. A windy night ahead, Scilly looks like being worse hit than the mainland, the strongest winds just west of Scilly 3-6am on 18th.

UPDATE 10:30 Wednesday
In the event a 64mph gust at Land's End in the early hours and mean speeds up to 45mph on Scilly.

More impressive was the well forecast swell. Everything went to plan and the low wound itself up steadily to the west of Ireland, and then tracked SE at just the right speed to accompany the swell, building it all the time. The swell built steadily at Seventones (just off Land's End) from an already large 11' at 15:00 yesterday, to a massive 28' by 04:00 today, the biggest swell of 2012.
Graham

Penzance Weather Station
Grid Ref:
SW464231 - Post Code: TR18 4TP
19m AMSL - Aspect SSE
In a SE - NW orientated valley

23 Years of Penzance Weather Records : http://penzanceweather.atspace.com/weather.html
Graham Easterling
 
Posts: 316
Joined: 2011 Nov 30, 20:29
Location: Penzance, Cornwall

Re: Stormy Wednesday for Cornwall?

Postby Len Wood » 2012 Apr 18, 11:27

Not much difference in max gusts between your locality and mine Graham.

63 mph Culdrose
58 mph Plymouth Mt Batten

according to
http://www.weatheronline.co.uk/
Len

Wembury, SW Devon coast
N50.33 W4.13
Altitude 83 m asl
Len Wood
 
Posts: 349
Joined: 2012 Jan 28, 16:12
Location: Wembury, coastal SW Devon, 83 m asl

Re: Stormy Wednesday for Cornwall?

Postby Graham Easterling » 2012 Apr 18, 12:29

Not much difference in max gusts between your locality and mine Graham.

63 mph Culdrose
58 mph Plymouth Mt Batten


Not a great difference I agree, but Mt Batten does seem to be about the highest recording in south Devon, whilst virtually everywhere on the coast here exceeded > 60mph. 66mph at NCI St Ives for instance.

Land's End achieved a mean speed of 51mph (F9) around 2am, not much less than Mt. Battens peak. The 1st F9 in April for a while. It was the 28' swell at Sevenstones that was quite something for April. Doesn't the breakwater look insignificant somehow? http://www.sennen-cove.com/today2.htm
Graham

Penzance Weather Station
Grid Ref:
SW464231 - Post Code: TR18 4TP
19m AMSL - Aspect SSE
In a SE - NW orientated valley

23 Years of Penzance Weather Records : http://penzanceweather.atspace.com/weather.html
Graham Easterling
 
Posts: 316
Joined: 2011 Nov 30, 20:29
Location: Penzance, Cornwall


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