National: Cold spell Charts/ Media/ Forecasts (Strictly no chit-chat) (15/12/2010)

nacho libre · 14-12-2010 5:11pm #1

Please keep chic-chat to the other thread.

ecmwind.096.png

look at that beauty! bone chilling upper atmosphere wind straight from the arctic freezer! we are talking polar low territory and active troughs crossing down over us!

feel free to edit this mods as you see fit.

WolfeIRE · 14-12-2010 5:32pm

latest GFS extending lifetime of the upcoming cold spell into christmas.

Snow risk remains for anywhere in Ireland from Thursday into Tuesday

TheMilkyPirate · 14-12-2010 5:41pm

T+186 on the latest GFS has a potent low over the south of ireland moving up and away to our east on wednesday next, Fantasy island i know but that would surely fall as sleet/snow given the temp charts for the same timeframe? Precip looks very heavy.

nacho libre · 14-12-2010 5:49pm

personally i think this chart maybe slightly conservative. i think parts of Ulster could have 4-6 inches of lying snow by Saturday afternoon.

snaps · 14-12-2010 5:49pm

If im not asking a stupid question, what do the different colours mean in that 1st chart?

WolfeIRE · 14-12-2010 5:53pm

wind speed snaps

Tom Cruises Left Nut · 14-12-2010 5:53pm

snaps wrote: »

If im not asking a stupid question, what do the different colours mean in that 1st chart?

I may be wrong but I think speeds ?

darkman2 · 14-12-2010 5:54pm

WRT Friday - there is an increasing risk of more significant snowfall across the country during the day. Looks like a frontal trough may move through. On the down side the mild sector will be close to the South coast so things look sleety there. But could be appreciable snow elsewhere. Have to be watched.

irishmotorist · 14-12-2010 5:58pm

snaps wrote: »

If im not asking a stupid question, what do the different colours mean in that 1st chart?

I'm still trying to figure out the general themes of the charts, but usually there's a legend of some description on the charts. In this one, the title at the top of the chart is "Wind speed/direction" at 850hpa (not sure myself yet what this bit means) and the side has the colour coding.

I've seen a good few references to 850hpa in the threads here over the last while. It sounds like it's a pressure, but is it related to altitude or anything?

Iancar29 · 14-12-2010 6:01pm

irishmotorist wrote: »

I'm still trying to figure out the general themes of the charts, but usually there's a legend of some description on the charts. In this one, the title at the top of the chart is "Wind speed/direction" at 850hpa (not sure myself yet what this bit means) and the side has the colour coding.

I've seen a good few references to 850hpa in the threads here over the last while. It sounds like it's a pressure, but is it related to altitude or anything?

Ye its relative to 1 mile or so above the surface.

whiteandlight · 14-12-2010 6:06pm

Iancar29 wrote: »

Ye its relative to 1 mile or so above the surface.

Thanks. Ive wOndered that too. It'll be my new thing learnt today!

irishmotorist · 14-12-2010 6:06pm

Iancar29 wrote: »

Ye its relative to 1 mile or so above the surface.

Without wanting a training session in all this (as I plan to get some books and learn a bit more myself), is there a law or rule of thumb that says how this relates to ground level? If this is a 2 semester answer, I can go digging myself rather than bogging here down...

eoinbergin · 14-12-2010 6:16pm

Hey guys last week i had a link to a great wind model which showed the progression over a couple of days and i cant seem to find it. I looked through the helpful links section but to no avail. Does anyone here have a good links that are not in the thread on links thanks

WolfeIRE · 14-12-2010 6:17pm

eoinbergin wrote: »

Hey guys last week i had a link to a great wind model which showed the progression over a couple of days and i cant seem to find it. I looked through the helpful links section but to no avail. Does anyone here have a good links that are not in the thread on links thanks

http://magicseaweed.com/msw-surf-charts2.php?chart=1&res=750&type=wind&starttime

http://www.xcweather.co.uk/

nacho libre · 14-12-2010 6:29pm

a chart to savour!

the 510 dam line that close by is incredible!!

we could have a prolonged spell of snow moving down across the country based on this chart. i also think unexpected features could well pop up over the weekend. so i feel it's reasonable to say most places in Ireland will have seen at least a bit of snow by Sunday! well i don't want to jinx things but we are getting into reliable timeframe now!

cian1500ww · 14-12-2010 6:34pm

I asked this in the other thread but I think it got lost in all the posts, how is this shaping up in comparison to the event that we had around this time last year?? I remember seeing the heaviest snow of my life exactly one year ago this coming Sunday.

hotwhiskey · 14-12-2010 6:38pm

Just take a look above Iceland it has just came into view looks impressive.

http://www.sat24.com/Region.aspx?country=eu&sat=ir&type=loop

th3 s1aught3r · 14-12-2010 6:51pm

hotwhiskey wrote: »

Just take a look above Iceland it has just came into view looks impressive.

http://www.sat24.com/Region.aspx?country=eu&sat=ir&type=loop

Is that the Greenland express?
I assume its going to come down and push that Atlantic front out of the way?

Brenireland · 14-12-2010 6:52pm

hotwhiskey wrote: »

Just take a look above Iceland it has just came into view looks impressive.

http://www.sat24.com/Region.aspx?country=eu&sat=ir&type=loop

Cheers for that looking good,moving fairly lively.... early tomorrow evening one would imagine we may see the floodgates open?...

mickger844posts · 14-12-2010 7:01pm

Friday looking great for the whole country bar the south west where it could be marginal with Dew points hovering around zero but still probably ok.

Tom Cruises Left Nut · 14-12-2010 7:02pm

mickger844posts wrote: »

Friday looking great for the whole country bar the south west where it could be marginal with Dew points hovering around zero but still probably ok.

Inquitus · 14-12-2010 7:13pm

When it says say 2-4mm of snow, am I correct in thinking that translates into a few inches as its describing the depth as if it fell as rain?

darkman2 · 14-12-2010 7:14pm

ECM going for a heavy period of snowfall across the country on Friday similar to the GFS. You can make out the warm sector off the South coast - spot on like the GFS.

DOCARCH · 14-12-2010 7:14pm

Inquitus wrote: »

When it says say 2-4mm of snow, am I correct in thinking that translates into a few inches as its describing the depth as if it fell as rain?

1mm is approx. = 1cm of snow.

qwert2 · 14-12-2010 7:18pm

I don't mean to be a snow kill joy, but I think we're in for a lot of cold weather and maybe not too much snow? I could be wrong. Does anyone think we're talking 1982 levels here?

darkman2 · 14-12-2010 7:21pm

qwert2 wrote: »

I don't mean to be a snow kill joy, but I think we're in for a lot of cold weather and maybe not too much snow? I could be wrong. Does anyone think we're talking 1982 levels here?

No, in a word:)

ninebeanrows · 14-12-2010 7:21pm

Netweather will go into meltdown after the ECM 96hr chart!

Shows snowstorm over London!

mickger844posts · 14-12-2010 7:21pm

Looking at the speed of the Greenland Express is it due to hit the country a little early ???

image.ashx?country=eu&type=slide&time=&index=2&sat=ir

TheMilkyPirate · 14-12-2010 7:24pm

qwert2 wrote: »

I don't mean to be a snow kill joy, but I think we're in for a lot of cold weather and maybe not too much snow? I could be wrong. Does anyone think we're talking 1982 levels here?

I hear this thrown around quite a bit, more so in the last few days. 1982 was an extreme event in ireland while it's possible (likely?) that something like that will happen again i don't think it will be this weekend. But then again i don't really know what i'm talking about as i'm only 22 so wasn't around and only have basic weather knowledge :pac:

darkman2 · 14-12-2010 7:24pm

Weathercheck wrote: »

Netweather will go into meltdown after the ECM 96hr chart!

Shows snowstorm over London!

Not only London - the (occluded probrably) front trails back over Ireland. And that after a prolonged period of snow on Friday.

ECM1-96.GIF?14-0

And more troughing from the South on Sunday

ECM0-120.GIF?14-0

That's 3 days of potential more prolonged snowfall. Interesting.

maiden · 14-12-2010 7:31pm

Whats are the lowest temps to expect?

National: Cold spell Charts/ Media/ Forecasts (Strictly no chit-chat) (15/12/2010)

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