Tag Archives: Met Éireann

Weather

I had not realised that the times of the Met Éireann inland lakes weather forecasts, broadcast by the Coast Guard on VHF, had been changed. The times are now

06:15
10:15 repetition
13:15
16:15 repetition

MRCC Dublin, to whom I am grateful for confirming the new times, says

Standby on VHF Channel 16 for your local working channel.

In bygone days the Lough Derg and Lough Ree forecasts were five minutes apart, but now the initial call on Channel 16 is at the same time everywhere.

I found the new 10:15 broadcast to be particularly convenient.

Forecast format

However, one aspect in which I thought the Met Éireann forecasts (also available here) less useful than those from other sources (eg Windguru) is the absence of a forecast for wind gusts. On several occasions this year, the gusts were (a) almost continuous and (b) much stronger than the forecast wind speed. They thus had more influence on our trip planning than did the base wind speed. It would be nice if Met Éireann, and thus the Coast Guard, could include a forecast for gusts.

Hire boats

The hirers’ training materials I mentioned here give good advice about rough weather on lakes but, after seeing several hire boats cross Lough Ree in weather that kept us in harbour, I wondered whether the lakes forecasts are readily available to hirers. If they’re not, perhaps they could be transmitted daily by text message?

I should stress that I did not hear of any accidents caused by stress of weather, but some folk may have had uncomfortable trips.

 

 

The wind today

From the Met Éireann National Forecast for today, made at 28 January 2016 05:09:

Temperatures will reach 10 or 11 degrees today and southwest winds will be fresh to strong and from the southwest.

Well I never.

 

Wind

I had been thinking that it was rather a windy summer on the Shannon, and  Met Éireann’s seasonal summary [select Year 2015 and Period Summer 2015 here to get a PDF] supports that view:

Seasonal wind speeds were the highest in at least six years at the majority of stations with records of up to 41 years exceeded at Shannon Airport (mean wind speed of 9.9 knots (18km/h)). Seasonal mean wind speeds ranged from 5.9 knots (11km/h) at Mullingar, Co Westmeath (its windiest summer in 11 years) to 13.8 knots (26km/h) at Mace Head, Co Galway (its windiest summer in 7 years).

Gale-force winds were reported on 9 days, with four of these days (June 1st, June 2nd, July 17th and August 3rd) reporting severe gales. Malin Head reported the seasons highest 10-minute mean wind speed and highest gust on June 1st with 47 knots (87 km/h) and 65 knots (120km/h), respectively, both the highest reported since the summer of 1988.

But what has caused this excess of wind? The learned Tyler Cowen reports today that there has been a shortage of wind in the Americas and that the amount of electricity generated by some wind farms has fallen.

Clearly, therefore, the missing American wind has ended up in Ireland, and the method of transmission is undoubtedly by the wind farms themselves. Just as the wind is caused by the waving of trees, so too is wind caused by the turbines of wind farms. And while American wind farms are set to blow, ours must be set to suck, thereby bringing American wind to Ireland.

They can have it back any time they like.

 

 

A little rain goes a long way

Here are some water level readings from Athlone Weir. I’ve taken them from the OPW’s very useful water levels site, where you can monitor levels from the comfort of your own armchair. [If only there were a gauge at Killaloe ….]

At Athlone, staff gauge zero is 35.360m above Poolbeg datum (from 18 Oct 2003). I chopped the bottoms off the first two graphs. The first one shows the level for 35 days to 30 September 2014; I presume that the level of Lough Ree was being reduced to enable it to hold some of the autumn’s rainfall.

Athlone Weir 20140930

Athlone Weir 35 days to 30 September 2014 (truncated)

Here’s the graph for the 35 days to 15 October 2014.

Athlone Weir 20141015

Athlone Weir 35 days to 15 October 2014 (truncated)

Then, in October, the level began to rise again. By 30 October, it was back to about 2.1 metres, roughly the starting point on the first of the graphs above.

Athlone Weir 20141030

Athlone Weir 35 days ro 30 October 2014

And since then it has continued to rise.

Athlone Weir 20141117

Athlone Weir 35 days to 17 November 2014

Met Éireann’s weather summary for October 2014 [PDF] has this chart:

Met Eireann weather Oct 2014

Met Éireann rainfall October 2014

It says:

Rainfall: wet conditions nearly everywhere

Monthly rainfall totals were above-average nearly everywhere with the exception of stations in coastal areas in the Northwest and West and in parts of the Midlands. Percentage of Long-Term Average (LTA) values ranged from 81% at Gurteen to 161% at Johnstown Castle, which recorded it wettest October since 2002.

Fermoy (Moore Park) reported 135% of its LTA with 153.6 mm and its wettest October in 10 years. The wettest days were mainly the 3rd, 5th and 28th, with the month’s highest daily rainfall reported on the 5th at Cork Airport with 38.6 mm, its wettest October day in five years. Mullingar reported its wettest October day in 12 years on the 28th with 26.4 mm. The number of wet days (days with 1 mm or more rainfall) ranged from 12 at Casement Aerodrome to 24 at Valentia Observatory and Claremorris, with Claremorris reporting its highest number of October wet days since 1973.

Use of the OPW charts is licensed under Directive 2003/98/EC [PDF] of the European Parliament and of the Council on the re-use of public sector information. Met Éireann allows use of “the web pages, and the information contained within them, for private and non-commercial purposes, for teaching, and for research […] is allowed subject to the condition that the source of the information is always credited in connection with its use”.