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Major Hurricane Helene


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6 minutes ago, CoastalWx said:

Because of the way the atmosphere works. You can be off just slightly, and the whole forecast goes to shit. Models off by even 10% RH in a large depth of the column are possible for sure.

 

And then there goes the forecast.

And the hip is connected to the thigh bone; and so it goes.  Being from the nonrtheast, Ive experienced enough busts so I shouldnt be surprised..   Tough to get the Big One to come to fruition.

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9 minutes ago, CTWeatherFreak said:

Loop current temps were around 87 degrees.. I wouldnt call that an inhibiting factor.

Yes, but (and this is not to argue, only learn)...compare a late-August storm before daytime highs, humidity, and general Gulf temps have broken to a late-Sept which was not as well-formed. Wouldn't those be the major differences in how this ended up?

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31 minutes ago, OSUmetstud said:

But drowning shots make big money. 

:lol: My wife prefers I come home. 

I prefer wind. 

16 minutes ago, erbsonci said:

If you don't mind me asking, do you do something related to storms? Like, why are you in Perry?

Storm chasing. I’ve documented a variety of hurricanes/blizzards/severe around the country (and Canada once) for almost a decade now. Usually my stuff gets picked up by outlets but for tropical, my chief passion, I love to forecast, document, and measure the impact of hurricanes. 

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2 minutes ago, erbsonci said:

Yes, but (and this is not to argue, only learn)...compare a late-August storm before daytime highs, humidity, and general Gulf temps have broken to a late-Sept which was not as well-formed. Wouldn't those be the major differences in how this ended up?

hurricane michael became  a cat 5 as it approached the coast in mid october...so that throws your gulf temps cooling out the window..

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7 minutes ago, OSUmetstud said:

This is something that Eric Webb brought up the past few days before Helene took off. I see some elements from the WSW drifting toward Helene on the mid-level WV that are originating from John's outflow to the southwest that could be affecting things. Mostly internal factors, but i think there could be something there. This is shear that's underneath the outflow layer. 

 

CODNEXLAB-GOES-East-regional-gulf-09-16_16Z-20240926_latlon-map_noBar-12-1n-10-100.gif

I was wondering as well. John virtually stalled and outflow sort of channeling towards Helene. Might be keeping the mid level dryness hanging around to the SW of Helene a bit longer than it looked two days ago.

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2 minutes ago, WEATHER53 said:

How far inland would a 15’ surge go before it dissipated to less than 1 foot?

These are inundation maps based on different hurricane categories. It depends on a lot of factors like the topography of land that the water is trying to flow over. 

https://experience.arcgis.com/experience/203f772571cb48b1b8b50fdcc3272e2c/page/Category-4/

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1 minute ago, franklin NCwx said:

Historic!

IMG_2711.jpeg.604a420df6179b03a17489dbe2c08e03.jpeg

I have never seen a 20-30” official forecast. And honestly wouldn’t be surprised if some places surpass that. Incredible. Even if the worst case doesn’t pan out, which it hopefully won’t, this one will be historic in its own right. 

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10 minutes ago, CTWeatherFreak said:

And the hip is connected to the thigh bone; and so it goes.  Being from the nonrtheast, Ive experienced enough busts so I shouldnt be surprised..   Tough to get the Big One to come to fruition.

I think it’s too early to say “bust” and with intensity forecast I’m not sure what would qualify. Would 115-120mph instead of 130 count as bust? The rain forecast looks perfectly on track so I see no bust there. Surge is also dependent on several different factors. 

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1 minute ago, BoulderWX said:

I have never seen a 20-30” official forecast. And honestly wouldn’t be surprised if some places surpass that. Incredible. Even if the worst case doesn’t pan out, which it hopefully won’t, this one will be historic in its own right. 

I believe there were forecasts that high in Texas associated with Hurricane Harvey. 

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Just now, BoulderWX said:

I have never seen a 20-30” official forecast. And honestly wouldn’t be surprised if some places surpass that. Incredible. Even if the worst case doesn’t pan out, which it hopefully won’t, this one will be historic in its own right. 

Deep fast tropical feed from the E/SE upsloping several thousand feet in those mountains. It’ll be bad for sure and for some favored places to rain in that situation, horrendously bad. As others mentioned already over 6” rain in spots. 

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7 minutes ago, BoulderWX said:

I have never seen a 20-30” official forecast. And honestly wouldn’t be surprised if some places surpass that. Incredible. Even if the worst case doesn’t pan out, which it hopefully won’t, this one will be historic in its own right. 

Me either.  It's been pouring here for the past 24 hours 

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3 minutes ago, Amped said:

Luckily it only has until 10 or 11pm tops before it gets on land. 

But it doesn’t need much time at all to really bomb from here if everything’s finally figured out. And if anything it might be bad timing since there isn’t time for an EWRC to get underway. 

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23 minutes ago, franklin NCwx said:

Historic!

IMG_2711.jpeg.604a420df6179b03a17489dbe2c08e03.jpeg

Can you link this? I can't find that exact image and I would like to send it to some peeople. Thanks.

 

Edit: Nvm. Finally found it. Thanks though. 

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Just now, jm1220 said:

But it doesn’t need much time at all to really bomb from here if everything’s finally figured out. And if anything it might be bad timing since there isn’t time for an EWRC to get underway. 

Remember though, Michael had zero fall troughs in the southern U.S. until mid-October, and that water was primed. 

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9 minutes ago, OSUmetstud said:

im a big fan of the hafs modeling project in general, but man these runs of going back and forth between intense hurricane and weak to moderate hurricane are a bit much. 

Those HAFS/HWRF/HMON I notice too are not capturing the 10m winds inland.  My experience has been the HRRR max 10m wind product verifies well with these inland once inside 8 hours.

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