Competition: Predict lying snow cm at ME stations 10 Dec and 11 Dec

Neddyusa · 09-12-2017 10:21AM #1

Just for a bit of fun! ;-)

Plenty of great amateur forecasters on here.
Great opportunity to nail your colours to the mast by predicting lying snow depths for tomorrow/Monday.

I'd suggest Sun morning 10 Dec and Mon morning 11th measurements for a Met Eireann Station.

I'm going for:
Sun: Mt Dillon 18cm
Mon: Gurteen 22cm

uck51js9zml2yt · 09-12-2017 11:11AM

Neddyusa wrote: »

Just for a bit of fun! ;-)

Plenty of great amateur forecasters on here.
Great opportunity to nail your colours to the mast by predicting lying snow depths for tomorrow/Monday.

I'd suggest Sun morning 10 Dec and Mon morning 11th measurements for a Met Eireann Station.

I'm going for:
Sun: Mt Dillon 18cm
Mon: Gurteen 22cm

Think about the children...and the people who will be flooded if your right.......you just don't care!!!!!

CrowdedHouse · 09-12-2017 11:24AM

Who measures the snow at automatic stations?

Larbre34 · 09-12-2017 11:55AM

CrowdedHouse wrote: »

Who measures the snow at automatic stations?

I do.

Larbre34 · 09-12-2017 11:57AM

Casement is nearest me, so 6cm peak snow depth btwn now and Monday night

Danno · 09-12-2017 12:47PM

Gurteen 29cm
OakPark 21cm

Calibos · 09-12-2017 12:57PM

Grange 0cm

JCX BXC · 09-12-2017 12:58PM

Knock 20cm

pauldry · 09-12-2017 01:19PM

Knock 25cm
Mullingar 14cm

Bonzo Delaney · 09-12-2017 01:39PM

Eloise Damp Self-improvement wrote: »

Think about the children...and the people who will be flooded if your right.......you just don't care!!!!!

Just a question for anyone that might know but
How many litres of water can be expected in a cubic meter of fresh fallen snow is there a rule if thumb figure ?

ninebeanrows · 09-12-2017 01:43PM

Mullingar 7cm.

gerrybhoy · 09-12-2017 01:45PM

Castleknock D15 3cm

kod87 · 09-12-2017 02:05PM

knock, 5cm

BLIZZARD7 · 09-12-2017 02:07PM

Gurteen 34cm
Oak Park 27cm

Donegal Storm · 09-12-2017 02:49PM

Claremorris 7cm

sryanbruen · 09-12-2017 03:33PM

Calibos wrote: »

Grange 0cm

:pac:

M.T. Cranium · 09-12-2017 07:08PM

Athenry 18 cm (Sunday morning) may tie with Claremorris, Knock or MtDillon
Danno 25 cm (Monday morning) Gurteen 22 Oak Park 20

some place could get 30 cm from this, not likely to be an official reporting site.

MidMan25 · 09-12-2017 07:57PM

Roches Point 0cm
Cork Airport 0cm
Moore Park 0cm

pauldry · 09-12-2017 08:10PM

MidMan25 wrote: »

Roches Point 0cm
Cork Airport 0cm
Moore Park 0cm

Are you the Cork Grinch? ðŸ˜€

MidMan25 · 09-12-2017 08:11PM

pauldry wrote: »

Are you the Cork Grinch? &#55357;&#56832;

I'm the Cork realist :pac: I'll be very happy if proven wrong!

SomethingElse · 09-12-2017 08:19PM

Athenry - 0cm
Johnstown Castle - 0cm
Ballyhaise - 0cm
Knock Airport - 0cm
Belmullet - 0cm
Mace Head - 0cm
Carlow Oakpark - 0cm
Malin Head - 0cm
Casement Aerodrome - 0cm
Markree - 0cm
Claremorris - 0cm
Mount Dillon - 0cm
Cork Airport - 0cm
Mullingar - 0cm
Dublin Airport - 0cm
Newport - 0cm
Dunsany - 0cm
Phoenix Park - 0cm
Fermoy Moorepark - 0cm
Roches Point - 0cm
Finner - 0cm
Shannon Airport - 0cm
Gurteen Agri College - 0cm
Sherkin Island - 0cm
Valentia - 0cm

EDIT: Predictions are in mm, not cm.

nacho libre · 09-12-2017 10:32PM

Knock 20 cm
Mountainy Man 35 cm
Mullingar 10cm

Neddyusa · 10-12-2017 12:37AM

nacho libre wrote: »

Knock 20 cm
Mountainy Man 35 cm
Mullingar 10cm

Knock of course!
How did I forget Knock? ! ðŸ˜‰
Also Oak Park likely to be close to the max.

What time are morning measurements made at the manned stations?

JCX BXC · 10-12-2017 11:29PM

So Knock, 13cm is the final figure?

Neddyusa · 11-12-2017 08:20AM

JCX BXC wrote: »

So Knock, 13cm is the final figure?

Not sure - I didn't realise that the un-manned stations have no instrument to measure snow-depth.

Come to think of it - surely ME are missing out on a very important data-set there?!
Or have they some other way of validating snow depths with their forecasts?

Gaoth Laidir · 11-12-2017 09:26AM

Bonzo Delaney wrote: »

Just a question for anyone that might know but
How many litres of water can be expected in a cubic meter of fresh fallen snow is there a rule if thumb figure ?

The liquid equivalent of snow varies with the type of snow. Dry, powdery snow can have a 40:1 ratio (i.e. 40 mm of snow would melt down to 1 mm of liquid) while yesterday's wet snow is more dense and could be more like 5:1.

1 mm of liquid precipitation is 1 litre per sq.m, so 1 cubic metre of snow could equate to anywhere from 25 litres for dry snow to 200 litres for wet snow.

Unfortunately the automated synoptic stations in the Republic have no depth-measuremnt instruments but in the North they do. The main airports in the Republic all report depths every hour, as do the ones in the North. Knock's 13 cm was the highest measured depth of them all.

Bonzo Delaney · 11-12-2017 10:33AM

Gaoth Laidir wrote: »

The liquid equivalent of snow varies with the type of snow. Dry, powdery snow can have a 40:1 ratio (i.e. 40 mm of snow would melt down to 1 mm of liquid) while yesterday's wet snow is more dense and could be more like 5:1.

1 mm of liquid precipitation is 1 litre per sq.m, so 1 cubic metre of snow could equate to anywhere from 25 litres for dry snow to 200 litres for wet snow.

Unfortunately the automated synoptic stations in the Republic have no depth-measuremnt instruments but in the North they do. The main airports in the Republic all report depths every hour, as do the ones in the North. Knock's 13 cm was the highest measured depth of them all.

Thanks for the explanation.
I was just curious as to whether co. councils could use snow depth as a measurement for flood risk assement when a thaw happens over a given sized area as in a football pitch covered in 100 mm of snow would potentially create thereabouts 20 k litres of water at about a 25:1 ratio .

snowstreams · 11-12-2017 11:24AM

There wasnt much snow depth at the Athenry weather station but just 10 miles further inland at loughrea and the depth was about 13cm.
Is there any weather station near ballinasloe in East Galway?

Gaoth Laidir · 11-12-2017 12:36PM

The liquid equivalent of Knock's snow was actually around 10:1, as it got 13 cm of snow from 11 mm of precipitation.

For areas lower than Knock's 206 m the snow would have been wetter and hence the ratio would have been lower, more like 5:1.

That's the problem with automation of stations. All our stations used to be manned and so reported hourly depths. Now only the 5 main airports do so.

We could of course install the automated ultrasonic sensors that they have in the UK (including Ulster), but I suppose the benefits are probably seen to be not worth the investment when you look at how infrequently snow affects us compared to the UK.

Competition: Predict lying snow cm at ME stations 10 Dec and 11 Dec

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