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Thunderstorms and Convective Potential

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    #212
    DOCARCH
    Moderators, Home & Garden Moderators, Science, Health & Environment Moderators Posts: 17,998 Mod ✭✭✭✭DOCARCH


    Snowbie wrote: »
    Just like in April when the upper air temps are a bit cooler than during the summer months, the CB's build quite quick with cold air aloft(due to polar maritime air over us also) and as with the DP being lower the air is quite clear so we can see the individual CB's with good visiblity (unless your under a downpour then it's different).

    Yea - three seperate large CB's/individual anvils out to my west and one to my east (shower that just passed over) was in my mothers house and there was a flash, which I assume was lightning, but didn't hear any thunder.

    Must be big 'uns out to my west - from sat, these look like they are running down through the midlands - look a lot closer/


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    #213
    shamwari
    Closed Accounts Posts: 2,142 ✭✭✭shamwari


    Looking at StormVue, the TS seems to have died once it went off shore.


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    #214
    Hal1
    Registered Users Posts: 8,720 ✭✭✭Hal1


    No TS here only some heavy rain which lasted a half hour. Sun is shining here now, maybe this will aid something to develop later. There seems to be a risk (gfs) for the southern half on friday but its early days yet.


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    #215
    Snowbie
    Registered Users Posts: 5,033 ✭✭✭Snowbie


    Interesting looking at Sat pic, you can make out the clear air between the shower/Ts and Hal is right in saying any surface heating from insolation will aid in convection.

    Showers are wrapped around the LP and have a SE to east motion so heavy showers and storms will push east.
    Next storm now just to the NW of the Dublin area.
    Low level shear is pretty good with the odd funnel (no convergence though) but longevity of storms is poor due to deep level shear low or nil.

    This is represented by anvils that are flattened and CB not tilted on it's axis away from the base. Basically a textbook CB cloud.
    Upper level winds are not too strong either and why the anvil is still attached to the cloud structure and not being blown out to the side or away from the main part of the CB cloud too much.

    Very rare we get to see individual cells, so if you capture any on camera, please share.


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    #216
    gonker
    Registered Users Posts: 1,290 ✭✭✭gonker


    A few claps of thunder just now in Drogheda. Massive clouds and a very short lived shower (about 10 seconds).


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    #217
    lucernarian
    Registered Users Posts: 9,235 ✭✭✭lucernarian


    That 10 second shower was a 30 or so minute downpour here. The most menacing clouds seemed to be to the north but I was in the attic when the lightning struck and it seemed to be from the south or nearly overhead of me. I don't think Snowbie's detector showed the three strikes I heard though...

    Still raining here nearly without break for the last 40 minutes.


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    #218
    Snowbie
    Registered Users Posts: 5,033 ✭✭✭Snowbie


    Just one boom and flash.

    Rain rate from that shower of 182.9mm/hr


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    #219
    Mr Benevolent
    Closed Accounts Posts: 12,456 ✭✭✭✭Mr Benevolent


    ANyone notice that thunder heard from more then a mile away is a rumble, but close up it's more of a nasty crackling sound?


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    #220
    Jackz
    Closed Accounts Posts: 1,506 ✭✭✭Jackz


    Thunder west wicklow.


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    #221
    Gonzo
    Moderators, Science, Health & Environment Moderators Posts: 16,910 Mod ✭✭✭✭Gonzo


    had a small thunderstorm about half an hour ago, about 10 claps of thunder and very heavy rain, I was out in the middle of it walking home when it started:)


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    #222
    squonk
    Registered Users Posts: 9,273 ✭✭✭squonk


    Well it's quite dark in the centre of Dublin here right now. Just rain so far. I've a 10 minute walk to the train when I get out of the office here at 5 so I'm hoping it'll be dry as I forgot my umbrella :(


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    #223
    DOCARCH
    Moderators, Home & Garden Moderators, Science, Health & Environment Moderators Posts: 17,998 Mod ✭✭✭✭DOCARCH


    Seems to be passing to both my north and sout here - very menacing clouds passing to my south.


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    #224
    Mr Benevolent
    Closed Accounts Posts: 12,456 ✭✭✭✭Mr Benevolent


    So is there any chance of more lightning over north Dublin today?


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    #225
    Snowbie
    Registered Users Posts: 5,033 ✭✭✭Snowbie


    Confab wrote: »
    So is there any chance of more lightning over north Dublin today?
    Always a chance when there is CB's present.

    http://www.sat24.com/frame.php?html=view&country=gb&sat=vis


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    #226
    Hal1
    Registered Users Posts: 8,720 ✭✭✭Hal1


    Level1 alert from estofex for tomorrow in parts of the north and whest:

    Another disturbance with unstable air arrives during the night over western Ireland. GFS 12Z indicates a zone of >250 m2/s2 SREH and 0-1 km shear of >12 m/s will be present and supportive of a tornado.


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    #227
    Snowbie
    Registered Users Posts: 5,033 ✭✭✭Snowbie


    Lightning to my south. No thunder


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    #228
    arctictree
    Registered Users Posts: 4,329 ✭✭✭arctictree


    Snowbie wrote: »
    Lightning to my south. No thunder

    Just heard some loud thunder to my west - didn't notice any lightening though. Sky is very dark in that direction...


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    #229
    CIDK
    Closed Accounts Posts: 34 ✭CIDK


    Dublin doing very well this year on the TS front


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    #230
    Weather BOFH
    Registered Users Posts: 371 ✭✭Weather BOFH


    Two cracks of thunder here just now, didn't see any lightning.


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    #231
    highdef
    Registered Users Posts: 6,261 ✭✭✭highdef


    Just heard a loud crash of it two minutes ago in Inchicore. Indoors with windows shut and still sounded loud and close


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    #232
    SexVicar
    Closed Accounts Posts: 12 ✭SexVicar


    Heard the same in Tallaght with a big flash. The sun is breaking through now though.


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    #233
    Snowbie
    Registered Users Posts: 5,033 ✭✭✭Snowbie


    Dublin doing very well this year on the TS front
    Only 1 passed overhead here so far this year , the infamous August deluge.

    W and S.Dublin and Co.Meath have done far better than N Dublin.
    But thunder heard (<2 boom and flash) has been up on last year but that is hardly classed as a storm.

    So only 1 thunder day here when a thunderstorm is witnessed once or more or on seperate occasions within 00hrs-24z.

    Basically bad for storms and good for odd rumbles.


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    #234
    squonk
    Registered Users Posts: 9,273 ✭✭✭squonk


    Just had 2 rumbles here in Dublin City Center in the past 20 minutes. The sun is out again now. The second rumble was quite loud.


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    #235
    Hal1
    Registered Users Posts: 8,720 ✭✭✭Hal1


    Thunder heard here too about 14:50. That cell gave some larger than average hail half of a 1cent coin I would say. Sun came out briefly then.


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    #236
    squonk
    Registered Users Posts: 9,273 ✭✭✭squonk


    Lashing and another crack of thunder or two here just now. It's either very heavy rain or there's a little bit of hail mixed in. I'm not near a window so can't tell.


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    #237
    Jackz
    Closed Accounts Posts: 1,506 ✭✭✭Jackz


    Loudest thunder I have ever heard.


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    #238
    DOCARCH
    Moderators, Home & Garden Moderators, Science, Health & Environment Moderators Posts: 17,998 Mod ✭✭✭✭DOCARCH


    Jackz wrote: »
    Loudest thunder I have ever heard.

    Would be good to know where you are Jackz?

    Heavy rain and sporadic hail shower here atm. Heard some very distant thunder.


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    #239
    aidan_dunne
    Registered Users Posts: 2,265 ✭✭✭aidan_dunne


    Had a couple of rumbles here in Portlaoise just before 5 o' clock. Sure enough, Danno's detector seems to have picked them up at that time as well. :D

    What was even better was the view after the shower passed through, though. I saw 3 of the best looking, most clearly defined anvils I've seen in a long time. By the time I got my camera out to take a pic they had started to disperse and move on, though I think I might have caught a bit of one before it disappeared. The way the cloudbases are bubbling up so quickly here today is very impressive. Just the sheer speed they're developing but then dispersing again is so fast, within 10 minutes in a couple of cases I was watching. I'll try and post up some pics later in the weather pictures section if I can.


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    #240
    aidan_dunne
    Registered Users Posts: 2,265 ✭✭✭aidan_dunne


    Kicking off again here! Just had two more rumbles and the second one was very loud and crackling. Horrible looking sky approaching. Think I'll plug out for a while just to be safe! :eek: Catch you later, folks! :D


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    #241
    mike65
    Closed Accounts Posts: 88,978 ✭✭✭✭mike65


    Just had a quick downpour with some thunder at the end.

    Mike


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