ATL: DELTA - Post-Tropical - Discussion

[WC08]

The deepening of the cold pool seems to have done the trick.
Inversion is likely all but gone.

https://i.imgur.com/KBJ4s22.png

What does this mean?

[ElectricStorm]

Appears to still be a slight thermal inversion below 1 km.
If that breaks, the cork pops

https://i.imgur.com/lr4Hdw0.gif

What does that mean? Is that inversion good or bad for the storm?

The inversion puts a block on the exchange of energy from the water.
Once the inversion is gone, it allows much more energy to flow into Delta.

There is a good analogy with the development of afternoon thunderstorms over land.
A thermal inversion in the lower atmosphere in the mornings blocks moist air from rising into the cooler atmosphere to precipitate.
Solar heating of the land during the day breaks down that inversion and then the thunderstorms quickly develop in the afternoon.
Pretty much the same principle here.

Ah thanks

[GCANE]

IMHO would be a big shock if see an extrap below 960 mb

[GCANE]

The deepening of the cold pool seems to have done the trick.
Inversion is likely all but gone.

https://i.imgur.com/KBJ4s22.png

What does this mean?

See my explanation to Weather Dude

[TheStormExpert]

Impressive Hurricane Delta. Looks better now than when it was a Category 4.

https://i.imgur.com/t4AY8c4.jpg

I will definitely agree this is the best it's looked!

Likely a major again if I had to guess.

[WC08]

The deepening of the cold pool seems to have done the trick.
Inversion is likely all but gone.

https://i.imgur.com/KBJ4s22.png

What does this mean?

See my explanation to Weather Dude

Thanks, I just read it. so are you saying the inversion is staying which would make it harder to gain strength?

[kevin]

New Extrapolated Sfc. Pressure measured by recon is 954.2 mbar!

[FLpanhandle91]

954.2 extrapolated. Wow.

[ElectricStorm]

New Extrapolated Sfc. Pressure measured by recon is 954.2 mbar!

Yikes at this rate my 945 prediction is in jeopardy of it keeps this up...

[northjaxpro]

New Extrapolated Sfc. Pressure measured by recon is 954.2 mbar!

Yes that is correct. Quite a significant pressure drop in the last few hours. Not good at all! We may be seeing Delta regain Cat 4 intensity a bit later this evening. This potential is certainly there.

[FLpanhandle91]

90+ kt in the SW quad is impressive.

[xironman]

954.2 extrapolated. Wow.

Unflagged 91kt SFMR on the weak side.

[Nimbus]

954.2 extrapolated. Wow.

Winds in the southwest quadrant haven't come up yet will probably see that next pass.

[Jr0d]

IMHO would be a big shock if see an extrap below 960 mb

954.2 mb on this pass, even with the adjustment, that is sub 960mb. Im guessing they will adjust it to 958mb...

Hopefully we will.get another center pass before the 5pm(edt) advisory.

[us89]

954.2 extrapolated. Wow.

Winds in the southwest quadrant haven't come up yet will probably see that next pass.

Keep in mind also the back left quadrant is typically the weakest part of a hurricane in the northern hemisphere.

[Steve]

Comparing the Delta thread to f.e. Laura and Sally it is still surprisingly quiet. I think this one might surprise a lot of people by how strong is is/will become. I think many people checked out once the Wilma level potential wasn't realized, but this is shaping up to be one massive major hurricane right now.

If Delta was threatening Texas or Florida this thread would be super active.

Sure. But remember that those had a lot more mystery. We have had a pretty good idea for several days what this was going to do.

[Senobia]

Comparing the Delta thread to f.e. Laura and Sally it is still surprisingly quiet. I think this one might surprise a lot of people by how strong is is/will become. I think many people checked out once the Wilma level potential wasn't realized, but this is shaping up to be one massive major hurricane right now.

If Delta was threatening Texas or Florida this thread would be super active.

It is impacting parts of Texas.
We're here.
Just watching and reading.

[ColdMiser123]

Mixing quite well now, given how close the SFMR values were to the FL wind found.

[Hypercane_Kyle]

Should be getting the NE quad here shortly. If it's a major hurricane again we'll find out shortly

[Tireman4]

Indeed