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11-10-2017, 19:52   #1
M.T. Cranium
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Extratropical Storm Ophelia - Technical Analysis Only - MOD NOTE post #1

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

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Just briefly for now, recent model runs (12z Wed 11th) have shown a track near Ireland for strong extratropical low (Ophelia) with timing converging on Monday 16th during the daytime hours.

The GFS model was of some concern but the ECM now has a very high impact low depicted at 965 mbs just about 70 miles southwest of Valentia by mid-day Monday.

This would evidently track through Ireland and Scotland on a generally NNE to NE path, which would bring damaging wind gusts into most of Ireland.

Too early to get very specific about impacts or peak wind speeds but these maps got my interest and look as intense as storm "Darwin" in 2014.

I wanted to get a dedicated thread into existence so that we can focus on this storm rather than using the tropical seasonal thread. Also, please note, obviously if this verifies a level 3 warning would be justified and at some point we will consider upgrading the current level 1 which is appropriate mainly because of the uncertain outcome, but an event of at least level 1 status seems almost locked in given the model consensus.

The GEM model is currently an outlier, like the rest of the pack it shifted east but that took its earlier eastern Ireland windstorm into Britain instead. It would be unusual for the GEM to beat out all these other models at five days so I don't give that much weight. However, it needs to be mentioned that this storm is currently a long way away (southwest of Azores) and relatively small for a hurricane, which it is about to become later today (last advisory had it as a high end tropical storm).

We shall see how the models respond to developments. The track towards Ireland makes sense when you consider how warm it is likely to be on the weekend and the position of the long-wave trough slowly moving east from the central Atlantic.

This could be a high impact windstorm for Ireland and the forum will be buzzing from now until the event comes into clear focus, after which it may be hyperactive, so post wisely with useful info as it comes along.

Mods, I will get in touch if I feel that a higher level or title change is needed. Get ready for a very busy few days.

Last edited by Lumi; 14-10-2017 at 11:14. Reason: Mod note
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11-10-2017, 19:55   #2
JCX BXC
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Have only realised the potential severity of this now! As I've said in the other thread, I hope nothing too severe or damaging comes about but the weather enthusiast inside me is jumping for joy at the thought of some actual weather!

At a minimum, it will be somewhat interesting on here! Thanks in advance for anyone who will supply information, Meteorite, Syran, Oscar Bravo and M.T, don't let us down!

Last edited by JCX BXC; 11-10-2017 at 20:37.
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11-10-2017, 20:08   #3
Meteorite58
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This is the ECM 12Z MT is mentioning. 5 Days out so adjustments to track and intensity to follow no doubt but certainly looks like a possibility of a significant event.




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11-10-2017, 20:11   #4
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Just for tasters...









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11-10-2017, 20:14   #5
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Am I seeing things or does that suggest 179km/h gusts over the dingle peninsula?
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11-10-2017, 20:24   #6
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You are not seeing things, but be aware that the average forecast error at 120h is on the order of 200-300 miles so those winds could hit anywhere this actually goes.

For example, when Irma was five days out from Florida, the track was predicted to be near the east coast, by event time that had shifted 150 miles west to the Keys and west coast, then it actually came in about 30-50 miles east of the late guidance.

Something like that same range of uncertainty exists here, with the added wrinkle of Ophelia's current small size which makes five day forecasts somewhat more uncertain than if we were dealing with a large cat-4 west of Bermuda heading towards Europe.

On the other hand, when you look at the large scale set-up, where else is this likely to go, it's going to ride up the thermal gradient between a cold central Atlantic and a warm south-central Europe.
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11-10-2017, 20:24   #7
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Looks a bit extreme, here is the mean wind speed chart for 16.00, the center of the ex tropical storm just off the Dingle Peninsula on this run so one would expect the strongest winds around its SE / NE quadrant. Long long way off yet to be certain how this will pan out.

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11-10-2017, 20:29   #8
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A very interesting synoptic evolution - certainly not a set up we are used to - will be fascinating to see how it evolves.
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11-10-2017, 20:30   #9
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The 12Z GFS on a very similar track and intensity as the ECM

Gusts


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11-10-2017, 20:33   #10
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JCX BXC looking forward to your TAF updates that day!
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11-10-2017, 20:36   #11
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The ARPEGE showing a bit track more W and arriving earlier, not often you see the models so close to each other 4 / 5 days out.



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11-10-2017, 20:59   #12
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What's the protocol with regards naming extra tropical storms that had originally been named hurricanes.If it impacts Ireland will it be become Storm Brian or remain Ex- Ophelia ?
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11-10-2017, 20:59   #13
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Excellent. Finally some interesting weather. But from following the hurricane season the other side of the Atlantic, one thing I've seen time and time again is these storms never end up where the models are saying they will this far out. But really looking forward to the rollercoaster
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11-10-2017, 21:05   #14
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After moving past Spain, forecasters expect Ophelia to come quite close to the Irish coast as a strong storm on Monday.

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11-10-2017, 21:08   #15
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Quote:
Originally Posted by squarecircles View Post
What's the protocol with regards naming extra tropical storms that had originally been named hurricanes.If it impacts Ireland will it be become Storm Brian or remain Ex- Ophelia ?
Because this storm had tropical origins, they'll keep the name.
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