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Spring/ Summer 2014 Convection Discussion


weatherwiz

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00z NAM develops a healthy looking line of storms by mid afternoon back across PA and central NY. A few discrete cells flare up by 5-6 p.m. across far western New England and also NH/ME. It looks like a late start, but that *could* capitalize on bonus heating.

Although the best forcing appears to remain west of SNE, the NAM finally ramps up the deep layer shear toward 00z, with an area of >40kts bulk shear reaching NW CT/W Mass. Without significant helicity and the front further west, the supercell potential will heavily rely on getting those greater shear values in.

We'll have to watch obs/trends and the HRRR to see how backed the low levels winds are too. This may end up being another Capital district region (Albany into far western Mass.) special with climo and forecasts favoring backed surface winds up the valley. That combined with the slower timing could result in some good bangers up that way and isolated spinners.

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When dealing with convection here and the threat for severe you have to be extremely patient and very understanding.  When it came to a day like today we had ingredients in place to produce severe, however, they all just didn't come together and we lacked the sufficient instability we needed.  While we talked over the past few days about the potential today sometimes I think some get a little carried away with the difference between "potential" and "what is going to happen".  

 

When it comes to convection, especially this part of the country you always have to be discussing and talking knowing that it's all potential...it's all dependent on A, B, C, etc and more times than none it all becomes a nowcasting event (even in the Plains it comes down to nowcasting at times...especially those setups where storm mode is a bit unclear until activity develops).  

 

Setups like today come with worlds of potential but everything has to fall in place and that's why it's not a good bet to just throw in the towel or give up b/c you just don't know.  We could have the same setup next Monday and next week could produce.  

 

Absolutely Wiz and others...together in time and place matters...many "weak" elements coming together can lead to "BIG" events !

Lol thanks, never seen that before. Gonna have to investigate. Looks like I'm going west tomorrow, aiming for that WY bullseye there. Or maybe just western mass.

Also, TWC has a torcon of less than two tomorrow. Hang up your hats, show's over. For sure.

Do that and if you base a forecast or expectation on TORCON you have a lot to learn

 

99% of us didn't get carried away, because we know that "potential" around here is always low.

The same isn't true of snowstorms. That's why most people here prefer them, or for the general public, pay attention to them. There isn't anything more to it than that.

Not completely true..IMO ANY WEATHER EVENT/ELEMENT/HAPPENNING ALL depend on how atmospheric elements/parameters come together in both time and place...one thing out of phase or not as BIG as forecast your screwed either way

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Not saying I put a lot of stock into the GFS for short-range convection forecasting, but a host of mixed signals.

Wiz will be delighted to see >2,000 J/kg SBCAPE along and NW of I-84 with some good overlap with stronger shear. However, low-level winds are not backed much at all. Some soundings even show a bit of a veer-back-veer with SWrly LL winds. Take it FWIW.

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Anyone nw of se ma wouldn't be complaining with the 9z hrrr. Interioe sne looks great today. Multiple segments/lines lifting northeast. Also, later in day as night begins to fall a widespread line rolling east probably maintained well into the area with elevated instability.

I am always skeptical east of a Danbury to Springfield corridor.
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Not completely true..IMO ANY WEATHER EVENT/ELEMENT/HAPPENNING ALL depend on how atmospheric elements/parameters come together in both time and place...one thing out of phase or not as BIG as forecast your screwed either way

 

People around my neck of the woods generally are concerned with precipitation, and will definitely hammer on a forecaster for getting that wrong. However, most of the general public would not know if a thunderstorm verified severe if they were standing in the middle of an open field naked during it.

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