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Thunderstorms

Snowbie

Continue to post here in the event of all things thunderstorm related,wheather it be radar,maps,charts,forecasts or just simple discussions.

Weather pics(clouds,lightning) in attachments only are allowed here otherwise use [thread=2055050139]Weather pics 2007[/thread] for your snaps.

Over the months you will find some variables or terms describing suitability of storms which are:
CAPE - This is the amount of potential energy in the atmosphere. High CAPE will indicate a high chance of thunderstorms.
LI - Lifted Index (LI) displays the 'trigger' potential at the surface to initiate unstable conditions. A low or negative LI will indicate conditions for thunderstorms are favourable.
Cb-Cumulonimbus or thundercloud.
Anvil-Where the top of the Cb reaches the stratosphere and spreads out like a flat top.
Cell or Supercell-An individual storm or a violent storm.
Squall line-Multi cellular organised storms forming in a line usually ahead or parallel to cold fronts.
Embedded Storms-Storms that are contained in overcast conditions
Convection-Warm air rising,cools,condenses forming cumuli clouds.
Orographic lift-Low level winds are forced to rise against rising terrain ie:mountains.Prevailing wind on a hot summers day,this lift can produce rapid convection.
Convergence zone-usually refers to a region in the atmosphere where two prevailing winds meet and interact, usually resulting in turbulent weather.
Lapse rate steepeing-is another fancy term for instability.
Sferics-Sound of low-frequency radio signals that derive from lightning strikes.Common terms would be strikes or strokes.

Some useful links

http://www.irlweather.com

http://www.gyweather.com/

http://www.isleofwightweather.co.uk/live_storm_data_sound.htm

http://www.wetterzentrale.de/pics/Rsfloc.html

Estofex

http://www.blitzortung.org/index.php?mode=0&map=5&lang=e

http://www.nowcast.co.uk/lightning/

http://meteocentre.com/lightning/map_sfuk.php?time=0&lang=en&map=Europe

http://www.estofex.org/guide/

If anyone has any more feel free to post them.

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Comments

nilhg

Rathangan Co. Kildare, huge big TS heading for me now.

nilhg

Big flash just now, lit up the whole room!

nilhg

And another

nilhg

Two more, and it's pi**ing down, time to go:eek:

lucernarian

I haven't seen such a menacing sky ever. The entire sky looks like lightning could erupt from it. And to the west, the land is shrouded out in rain. It will be great if there was some lightning, it looks spectacular at night.

I'm going to disconnect the internet after the 9 pm radar is shown. That sky is evil-looking!:eek:

Supercell

Keep the reports coming lads!
I reckon our north Dublin members have some fun on the way soon too, Snowbie stay online!!

nilhg

Had 7 or 8 flashes over the space of 15 minutes or so, seemed to be along the front edge of the rain. Still raining here but lighter.

Snowbie

Rain not here atm,and its still quiet from my detector.Unfortunately.

Supercell

Its raining cats and dogs here, any action north of the mountains, would think North Dublin shoulkd be getting some big downpours atm ?

Snowbie

Aye just started to rain now,i can see the heavier stuff on the radar alright.

Trogdor

Just started here also, can here the heavier stuff already
EDIT: That didn't take very long, pi**in down here now, the clouds have a strange orange tinge to them

darkman2

No thunder or lightning to report here.

The problem is once the sun disappears below the horizon the energy goes very quickly.

Supercell

Snowbie wrote:

Aye just started to rain now,i can see the heavier stuff on the radar alright.

What kind of rain rates are you seeing?, its belting down here and i'm far south of the main action - currently 44 mm/hr ..its bouncing up off all surfaces .

darkman2

trogdor wrote:

Just started here also, can here the heavier stuff already
EDIT: That didn't take very long, pi**in down here now, the clouds have a strange orange tinge to them

Any lightning?

Trogdor

darkman2 wrote:

Any lightning?

You think i'd keep it a secret?:D

No, no lightning to report here.

Supercell

Rain trailing off here, clouds visable - show over.

Should be some big rain rates in north of Dublin city, have we any Dundalk or Drogheda members with stations here?

Snowbie

Longfield wrote:

What kind of rain rates are you seeing?, its belting down here and i'm far south of the main action - currently 44 mm/hr ..its bouncing up off all surfaces .

Its only starting to pick up as i type,nothing registered yet and still no sferics.

Takeshi_Kovacs

Looks like it is very heavy in Dublin and Meath at the moment going by the radar

Trogdor

Noticed a Flash of thunder to my South-West just now, out of my window accompanied by a low rumble off in the distance, a good 25/30 seconds after

aidan_dunne

Just reporting back on the earlier activity in Portlaoise.

Some very bright flashes of lightning for a while earlier and one, in particular, at 8 p.m. on the dot lit up the whole place and was so bright it was almost blinding :eek: (I was looking directly out the window at the time). It was followed immediately after by an incredibly loud crack of thunder that shook the whole house. In fact, it almost sounded to me like the distinctive "double boom" you'd hear after a sonic boom, there were kind of like two bangs one after the other followed then by the sound of it rolling across the sky for a good half a minute or so. It must have been right overhead or as damn near to it as you can get, judging by that.

The storm flashed and rumbled on for maybe an hour or so around here before moving off but the rest of the flashes and bangs were an anti-climax compared to the one I just described above. That one was definitely one of those "fúck me!" (yes, those were my exact words at the time, by the way!

), too-close-for-comfort-and-pretty-scary types, believe me! :eek:

lucernarian

There was nothing to "enlighten" us last night here. Just some heavy rain, despite the sky's suggestions.

Nice enough chart for northern areas for today: http://www.wetterzentrale.de/pics/Rtavn1211.png

The t+18 moves that to east Ulster/North Leinster. There had better be some lightning in it!!

Wertz

Extremely active t-storm just moving out into the bay in Dundalk here....several rumbles and a few flashes. Rumbles are about 20 seconds aaprt and prolonged...

[edit] Strange, nothing showing on snowbie's detector

Snowbie

Wertz wrote:

Extremely active t-storm just moving out into the bay in Dundalk here....several rumbles and a few flashes. Rumbles are about 20 seconds aaprt and prolonged...

[edit] Strange, nothing showing on snowbie's detector

Thats exactly what i need to know.I have corrected the ranging in your part of the world and should see the corrections in a few moments if the lightning persists.
Just to make it clear again,the detector or any detector will have optimum ranging in the stronger stoms.

Wertz

Okay well there's a second cell to my WSW producing rumbles as I type....anvil is over me now but main body is about 4 miles inland.

[edit] Strong continuous rumbling coming from west...main body is moving S of me. Inter cloud flashes.

[edit2] Snowbie if it's any help I'd say you're still estmating the current pool of strikes as being about 15-20km too far N...unless that is, there's a monster of a cell in central Armagh. I'd be pretty confident the cluster on the map currently is the cell just S of Dundalk.

Wertz

Mammatus formations on the underside of the anvil. They stretch for about 30 degrees across the sky.
Never seen them so clearly here before....pity it's not sunset.

Snowbie

Wertz wrote:

[edit2] Snowbie if it's any help I'd say you're still estmating the current pool of strikes as being about 15-20km too far N...unless that is, there's a monster of a cell in central Armagh. I'd be pretty confident the cluster on the map currently is the cell just S of Dundalk.

I thought it ranged it spot on in the end.At least next time it should be closer.Just replayed the archive of your 2 cells and it takes time and the more strikes for calibration to adjust but it got there.

137 strikes in total from them 2 cells.Good storms by all accounts.

Supercell

Looks like there's a beefy shower down towards Gorey on the 19:00 radar, anyone down that direction ? ..Tristrame?

Wertz

Okay I combined 4 shots into this one with some mucking about in PS...to give you an idea of the scope of the cloud, it spanned the roofs of six houses in that; the base of the cloud would have been about 10 miles south at that stage.

3200*1200~ px

Trogdor

Good thunderstorm here last night around 5am. First strike i saw struck right down on a bouy in Lough Swilly beside where we are staying. Must've been less than 1km away. Winds are very strong here as well. Sunny and bright now anyway

fatherdougalmag

There was an amateur weather chap on Newstalk 106 this morning from Donegal. He was saying that we're in for an Indian summer setup because of fog on the mountains and he saw a stork going up a mountain.

So, just stay away from the drinking water up there. There must be something in it.