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Snow and Ice Warning : Saturday(PM)/Sunday 9th/10th December - SEE MOD NOTE POST #1

Kermit.de.frog

MOD NOTE

This is a busy thread and as a result the Mod Team will be taking a zero Tolerance approach to trolling and flaming

Don’t say you weren’t warned!!

And please don’t feed - report & let the Mod team deal with it

**It would be helpful to all that when posting weather reports that locations are added in the post ( this can be kept general if preferred) **

Thanks

As requested.

Sunday will be an event for many Northern and North Western areas. With regards to other areas it's a delicate situation.

To summarise:

Rain will move in from the southwest on Saturday night but will meet embedded very cold air over the country. It will turn to snow as it moves northeastward. It's a classic "battle ground" scenario between different air masses.

It will fall as snow initially over North Leinster (it will turn back to rain for a time). Over Ulster and most of Connaught it will fall as heavy snow throughout the event. Large accumulations in these parts. I would be of the opinion at least an orange warning is needed for these parts as of now - possibly red nearer the time.

Later on Sunday as the system begins to unwind and move away it returns to snow over Leinster and turns to snow in Munster with accumulations here. Not as significant but could still be disruptive.

As it clears it gets very cold and icy - another hazard in itself. Temperatures will plunge Sunday night well below freezing. Coldest night of the year so far.

This looks a severe event in the north and northwest including northern Connaught right now.

There is still the risk of significant snow further south as well. This is not 100% nailed in terms of where this will effect. Regardless many are going to see a significant snowfall.

I think it is safe to say this will be the most significant frontal snow event the country has seen in many years for the areas effected.

This is 48 hours out. There is no doubt it will be impactful.

Another risk is flooding, a lot of water associated with this.

I would advise people in the north and northwest - and Connaught - to keep up to date on forecasts and be prepared.

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davidsr20

Nice covering this morning in craughwell but by far the best iv seen on my drive today was loughrea to ballinasloe on the old dublin road it was fairly extream council out plowing the roads and near 2 foot high in the edges and middle after they were done. Around kilreekil was the worst 2010 material.

Oscar Bravo

9pm.... its getting cold

Mount Dillon -4
Markree -4
Ballyhaise -3
Athenry -3
Claremorris -2

James Bond Junior

Hovering around -1.7/-1.8 in Limerick city at the moment. I was down in Kerry for the weekend and was very disapointed to return to a snow free Limerick.

GoneHome

[QUOTE= I was down in Kerry for the weekend and was very disapointed to return to a snow free Limerick.[/QUOTE]

Same as that, I came back from Kerry this evening snow free but definitely much colder here in North Cork/South Limerick.

elvis99

Few from today, just south of Finny (other-side of the lake in photo), Galway/Mayo border.

The depth measurement of just over 6 inches was at 78m asl.

Easily one of the best events here since December 2000 Polar low event. Have to commend the performance of the HIRLAM and various short range models. I was initially very sceptical of the forecast amounts.

TomOnBoard

Can anyone explain what exactly is the temperature that is quoted in all these reports. Is it air temperature right on the ground, 2 metres above the ground or something else. Or is it the temp of the ground itself, or something else entirely?

I just went out with my Chinese temperature gun thing (with the IR/red laser built in) and found the following readings:

The ground itself: -7
A metal stand for a patio brolly: -11
An empty gas cylinder: -9
Ice on the top of a bucket of water: -10

Accuweather is showing my location as being at -2.

Confused!

irishrover99

A lot of disappointed dubs on here today. I live in rathfarnham so I went up to ticknock with the kids and their was plenty of snow up there at the first car park about 200m. Drove the car as far as the snow line and then walked the rest. The kids had a great time and when they started feeling cold we left.
Off work tomorrow using my last holiday of the year so might pop up again while the kids are in school.
It was actually nice getting to the snow but not having it in your garden and walking the slush into your house anytime you pop out.
Enjoying a nice Rioja from Lidl now after the kids went to bed shattered.

Oscar Bravo

Met hourly reports are air temperature ,At automatic stations and at the airports temperatures are measured by means of platinum resistance thermometer, at other locations the temperature is read by means of a mercury-filled thermometer

Pangea

Currently -2 and drizzling rain in SW Donegal, typical.

Oscar Bravo

Pangea wrote: »

Currently -2 and drizzling rain in SW Donegal, typical.

now thats annoying to be fair

Gaoth Laidir

TomOnBoard wrote: »

Can anyone explain what exactly is the temperature that is quoted in all these reports. Is it air temperature right on the ground, 2 metres above the ground or something else. Or is it the temp of the ground itself, or something else entirely?

It's the air temperature at 1.5 metres above a grassy surface. On nights like this the ground temperature will be a lot lower

TomOnBoard

Gaoth Laidir wrote: »

TomOnBoard wrote: »

Can anyone explain what exactly is the temperature that is quoted in all these reports. Is it air temperature right on the ground, 2 metres above the ground or something else. Or is it the temp of the ground itself, or something else entirely?

It's the air temperature at 1.5 metres above a grassy surface. On nights like this the ground temperature will be a lot lower

So the readings I got outside make some sense?

flaneur

The M8 from about the Cashel Services to Cork is absolutely fine. The temperature rises from 0°C to +2°C in Cork.

There's serious risk of ice on the M7 through from Kildare to the M8 exit and on the M8 until about Tipperary.

The surfaces are well treated but the small roads, including into some of the services have compacted, refrozen snow.

There's also frozen compacted snow lying in some of the toll lanes (notably the express lane (which is closed))on the M7 beyond Portlaoise. Be very careful approaching them.

I had a few absolute muppets tailgating and also overtaking without fully entering the fast lane because they thought there was ice in it! I had a car one overtake me and then swirve right in on top of me!

I was driving through and conditions in NI today too and similarly ridiculous behaviour.

A small % of people really need a LOT more cop on!

Grandeeod

Woke up to a lovely dumping of snow this morning on the Laois/Kilkenny border. It started to change from rain to snow around 5am. Lots of unprepared folks around me this morning, which I always fail to comprehend. Some funny sights.:D A slight thaw towards lunchtime, but once the sun started to go down so did the temps and the slushy sound from cars turned to a crunch and now crackle. Local schools have already texted to say they are shut tomorrow.

Whether it's snow/slush or a wet road these low temps will obviously bring crappy conditions in the morning. A nice snow treat though.:D My only gripe would be the way some stupid people drive in conditions like today. I watched drivers from my living room window drive at stupid speeds in an attempt to get through snow and still get stuck. Saw a poor cat get splattered by a driver that lost control. Personally I took the advice from ME and this forum. In all day. Warm and safe. Best of luck to all in the snow zone that's turning into the ice zone. Just be carefull.;)

yorlum11

You can see those showers clearly here. Up tp 11pm.

prosaic

TomOnBoard wrote: »

Can anyone explain what exactly is the temperature that is quoted in all these reports. Is it air temperature right on the ground, 2 metres above the ground or something else. Or is it the temp of the ground itself, or something else entirely?

I just went out with my Chinese temperature gun thing (with the IR/red laser built in) and found the following readings:

The ground itself: -7
A metal stand for a patio brolly: -11
An empty gas cylinder: -9
Ice on the top of a bucket of water: -10

Accuweather is showing my location as being at -2.

Confused!

The ground is going to be emitting heat, so that's warmer.
The sky will be like having a very very cold freezer overhead: Infrared radiation from obects go up into the sky but very little infrared radiation comes back down so the net effect is cooling. If you have something isolated from surrounding, e.g sitting in a hollowed styrofoam container, open to the sky, it will get very cold.
You can add a few more variables into the mix: how reflective the surface is in the infrared, orientation to the sky/ground/surroundings, humidity in the air, other conduction, convection paths for heat.
Do a few experiments. It's fun.
Turn your thermometer to the sky. It might read -50 or something.

JCX BXC

Temperature had gotten down as far as -1.7c here in West Clare, however has risen now as high as -1.0c. Looks like a thaw could set in before morning?

Villain

Hoping I might get to see some more drifts tomorrow but getting around could be tricky.

Some more like this would be nice

https://twitter.com/carlowweather/status/939863505662021632

boxer.fan

Pangea wrote: »

Currently -2 and drizzling rain in SW Donegal, typical.

Snowing nicely here in Northwest Donegal right now ðŸ˜

Gaoth Laidir

TomOnBoard wrote: »

So the readings I got outside make some sense?

Yes, things like a metal pole, bucket, car roof, etc., will radiate out heat very quickly in the form of longwave radiation on a clear night, with no cloud and low water vapour to radiate this heat back.

Air is not a good conductor, so while the air close to these objects does cool eventually, air further away (e.g. 1.5 m away from the cold ground) takes a lot longer to cool.

Take a look at tomorrow morning's grass minimum temperature reports. They will most likely be 5-10 degrees less than the minimum 1.5-metre air temperature.

Pangea

Oscar Bravo wrote: »

now thats annoying to be fair

Starting to change to wet snow now, the rain has frozen on the ground, lethal driving conditions..

Gaoth Laidir

-7 at Belfast Aldergrove now.

dfx-

sryanbruen wrote: »

Looks like Monday night will be another severely cold night for the UK, -12c for a second consecutive night. Been a long while with minimums as low as that for a consecutive period.

https://twitter.com/bbcweather/status/939959205263478784

It's hovering around 0c in UK midlands for hours, warmer than a lot of places recently quoted and it just hasn't stopped snowing all day, sometimes at different intensity.

Some amount of disruption tomorrow I'd say.

Dank Janniels

I can feel a draught in my room, think from the corner of 1 of the windows! Baltic!!

lolie

The BBC forecast earlier showed plenty of showers moving down later in the night but mostly falling as rain though.
Unless the temperatures rise the roads could be lethal if it falls on to frozen ground.

nagdefy

Funny how all the Met Eireann bashers who were on here when it was raining heavily between 10pm and 1am last night disappeared today.. Melted away much more quickly than the snow:p

Some ridiculous bashing on here last night.

giveitholly

nagdefy wrote: »

Funny how all the Met Eireann bashers who were on here when it was raining heavily between 10pm and 1am last night disappeared today.. Melted away much more quickly than the snow:p

Some ridiculous bashing on here last night.

Exactly well said

Pretzill

5 below and freezing out there.

S.Sligo
90m asl

jimbobaloobob

Is it likely that this type of event could be typical this winter?

Soccarboy11

-1°c here in Cork. Frost on the grass and just starting to form on the roofs of the cars, only a thin layer though so musnt have been below freezing for long.