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Spring/ Summer 2014 Convection Discussion


weatherwiz

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More data is more better. Been talk about getting radiosonde level equipment on jets and plugging it into the main models, some jets and private forecast companies already do so.

That's a bit different than shooting a laptop into the atmosphere, presumably with firecrackers.
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Seems like an unpredictable situation the next few days with the only certainty being pouring rain across the entire area. Widespread instability seems like a lock and is modeled on every piece of guidance I've seen but favors different areas while making a general focus shift to the east on wednesday. The real question seems to be what occurs Wednesday as the storm departs and of course the well mentioned severe threat tomorrow (tuesday). QPF maxes seem to be varied across the models, with some predicting litchfield county and the berks. Some have HVN to New Bedford potential south coast jackpots in addition. With the setup it would make sense to me, especially if the firehose makes an appearance. My thinking is that anywhere nw of bos-pvd has a pretty substantial severe threat tomorrow (of course already excluding the south shore of sne). It's pretty damn unstable and combined with moisture, one wet fart and you will have towering cu. I think the tor threats might be mixed into a line or multicell when all is said and done (sort of like midatlantic today. Seems like it would be kind of hard to maintain a distinct discrete classic super cell in this environment with no cap. I'm kind of skeptical on the firehose, but my interest is sparked because the euro is bullish on it.

 

 

Euro actually had a great handle on the rain this afternoon, looking back at it now. At the same time it has impressive instability for almost the entire area on Tuesday, highest cape is in previously mentioned spots in the west and then shifts east as the evening continues on. Good cape Wednesday SE of BOS, BDL, HVN. Also torrential rains. Euro just smoked the gfs handling this front a few days too. Kinda leaning on this.

 

Nam 18z 12km seems meh to me on Tuesday in SNE. Wagons NW with the good stuff. Of course still widespread drenching rains. However, Wednesday is an absolute firehouse deluge south of Boston and even into the city in eastern mass.

 

18z RGEM/GEM says max qpf litchfield county, good dousing for the entire region, but no real matching qpf maxes in the east or south coast like other models suggest. Just isn't as substantial as any other model. Seems underdone considering that. Also considering I'm probably already almost reaching the rain total it suggests two days from now as being the storm total.

 

18z GFS looks similar to the nam but without the wednesday show in the east.

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18z RGEM/GEM says max qpf litchfield county, good dousing for the entire region, but no real matching qpf maxes in the east or south coast like other models suggest. Just isn't as substantial as any other model. Seems underdone considering that. Also considering I'm probably already almost reaching the rain total it suggests two days from now as being the storm total.

Messenger is rolling in his seasonal grave.

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I wouldn't be using the GFS for anything related to severe lol. It had the front thru tomorrow morning if you recall

 

Well the GFS can have better handles on these setups...often times it's much more realistic when it comes to projected cloud cover...NAM can often overdo cloudiness.  

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21z SREF has decent probs for >1000 J/KG of Cape...backed off a bit though on probs for >2000 Cape.

Assuming this is SBcape?

fcap24.gif

Are the SREFS decent severe indicators? Totally honest question...never really looked at them in the warm season.

I ask because they were absolutely atrocious all winter, to the point of being un-usable.

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Are the SREFS decent severe indicators? Totally honest question...never really looked at them in the warm season.

I ask because they were absolutely atrocious all winter, to the point of being un-usable.

 

Just like when using them for winter indices and such they are great to look at to get an idea of what the mean is for (in this case) cape projections.  In this case the 21z run is showing >80% probs of getting >1000 J/KG of Cape so seeing that certainly is an indicator that is what we will be dealing with.  

 

SREFS can be absolutely huge when dealing with these situations b/c you can gauge what way to lean.  

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Are the SREFS decent severe indicators? Totally honest question...never really looked at them in the warm season.

I ask because they were absolutely atrocious all winter, to the point of being un-usable.

 

Actually they do much better with severe than snow lol

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