ATL HANNA: Extratropical - Discussion

[KWT]

Estimated center still right in the deep convection and its still blowing up. As Aric said there is some good divergence which is no doubt helping to create the explosive convection.

Models done a good job forecasting strengthening despite the shear aloft, seems like thats whats happened and as long as shear doesn't really power up I can see this strengthening steadily a little more yet.

[bob rulz]

It brought a question to mind.
What is the record for number of active storms in the Atlantic basin at one time? Can anyone let me know?

I believe the record is 4. Last time that happened was 1995, when I think (?) it was Humberto, Jerry, Iris, and Karen all at the same time. We could easily tie that record again today or tomorrow.

There were FIVE at one time during 1995-you left out Luis. Easy enough to do as it never impacted the UUS but I have first hand knowledge having lived through Luis in the Caribbean-not a fun time, I can assure you. I still have nightmares of a CAT 4 on a small island.

Here is the data:
http://www.nhc.noaa.gov/1995humberto.html

Lynn

Wasn't Luis still a tropical depression while those other 4 storms were churning out there though? I'll have to go back to the research again...

[Matt-hurricanewatcher]

When Gustav weakens in it is doing so now, I expect this to strengthen. This thing is huge and it would not suprize me to see a cat3 hurricane form from this.

[wxmann_91]

In response to KBBOCA, the record number of storms in the ATL basin at one time is 4. Off the top of my head, I know it occurred in 1998 (Georges, Ivan, Jeanne, Karl), and 1893 (sometime in that decade, not exactly sure if it was 1896 or 1893).

[HurricaneQueen]

I believe the record is 4. Last time that happened was 1995, when I think (?) it was Humberto, Jerry, Iris, and Karen all at the same time. We could easily tie that record again today or tomorrow.

There were FIVE at one time during 1995-you left out Luis. Easy enough to do as it never impacted the UUS but I have first hand knowledge having lived through Luis in the Caribbean-not a fun time, I can assure you. I still have nightmares of a CAT 4 on a small island.

Here is the data:
http://www.nhc.noaa.gov/1995humberto.html

Lynn

Wasn't Luis still a tropical depression while those other 4 storms were churning out there though? I'll have to go back to the research again...

Bob,
You may be right but this is what I took from the link I posted:

"Humberto coexisted with four other tropical cyclones (Iris, Karen, Jerry and Luis) in the Atlantic basin. The hurricane traveled several days through the open Atlantic without hitting land." I does not differentiate between category of storms.

Now back to Hanna and her little and big brothers.

Lynn

[MiamiensisWx]

Hurricane Bob (1985) came close to Savannah, however the last storm to bring hurricane conditions to the city was David (1979), which made final landfall just southwest of Savannah at 80 knot intensity. The 1947 hurricane hit the city at 75 knots. Other Savannah hurricanes include: 1940, 1911 (both 65 knots), 1898 had two hurricanes to hit Georgia (both around 85 knot landfall intensity), and the 1893 hurricane made landfall near Savannah at 95 knots, thereby making it the strongest hurricane of recent record to hit the city.

- Jay

A few friendly addendums:

-The 1940 and 1947 hurricanes actually produced Category 2 winds at landfall, respectively.
-The 1893 hurricane was 100 kt/954 mb (Cat 3) at landfall SSE of Savannah, Georgia.

Here's the official data...

http://www.aoml.noaa.gov/hrd/hurdat/ushurrlist18512007.txt

1893 featured four TCs that were active simultaneously, in addition to 1998.

[KWT]

Well its huge Matt and also importantly its bursting still some pretty crazy convection, I've not seen such a wide coverage of powerful convection for a while.

Still looks like its getting slowly better organised as well.

[Chigger_Lopez]

Does Everyone buy the fact that all of the models are showing Hanna basically stationary or very close to it for the next 30ish hours before moving NW. That is a very long time for NO movement.

[meteorologyman]

Won't be too long before we lose visual sattelite on Hanna and back to crappy Infrared

[captain east]

Is the track still shifting west? I just got back...

[Aric Dunn]

Is the track still shifting west? I just got back...

yeah

[meteorologyman]

Is the track still shifting west? I just got back...

'just a little not much

[WindRunner]

Won't be too long before we lose visual sattelite on Hanna and back to crappy Infrared

IR images work perfectly fine, as long as you know how to use them properly. And if one does know how to use them, then there is actually a lot of extra information to be gained from IR that is not readily apparent in normal daytime vis imagery.

[bob rulz]

I believe the record is 4. Last time that happened was 1995, when I think (?) it was Humberto, Jerry, Iris, and Karen all at the same time. We could easily tie that record again today or tomorrow.

There were FIVE at one time during 1995-you left out Luis. Easy enough to do as it never impacted the UUS but I have first hand knowledge having lived through Luis in the Caribbean-not a fun time, I can assure you. I still have nightmares of a CAT 4 on a small island.

Here is the data:
http://www.nhc.noaa.gov/1995humberto.html

Lynn

Wasn't Luis still a tropical depression while those other 4 storms were churning out there though? I'll have to go back to the research again...

Bob,
You may be right but this is what I took from the link I posted:

"Humberto coexisted with four other tropical cyclones (Iris, Karen, Jerry and Luis) in the Atlantic basin. The hurricane traveled several days through the open Atlantic without hitting land." I does not differentiate between category of storms.

Now back to Hanna and her little and big brothers.

Lynn[/quote]

Okay, just did a bit of research and all four of those storms did co-exist at the same time. On August 27, TD13 (which would become Luis) formed, but Jerry had weakened to a tropical depression way back on the 24th, but was still dumping its heavy rains. On August 28, Jerry dissipated. So for a while, all 5 did co-exist, but Jerry and Luis were tropical depressions. Then on August 29, TD13 strengthened into a TS. So the four tropical storms that existed at the same time were Humberto, Iris, Karen, and Luis.

I forgot that it also happened in 1998, when it was much more clear-cut than that.

[gatorcane]

this truly may end up being up one of the largest hurricanes size-wise in Atlantic basin history. Even with shear hitting her hard.

The size of Hanna as she continues to grow is simply amazing:

[meteorologyman]

Won't be too long before we lose visual sattelite on Hanna and back to crappy Infrared

IR images work perfectly fine, as long as you know how to use them properly. And if one does know how to use them, then there is actually a lot of extra information to be gained from IR that is not readily apparent in normal daytime vis imagery.

That's very true, I'm one of those that have trouble with them but I can disect what part is strengthening or weakening but sometimes Infrared seems like it over does it, and sometime hard to find the eye when it hasn't fully developed

[jlauderdal]

Charleston's definately got it's eyes on this one... we are making plans to batten down the hatches already at the marine lab I work at. Let's hope this is at most Cat 1 or lower when it gets up here, just enough to not cause much damage and provide some good shelling in the next week or so. We can only hope.

you sure are alot more confident in your track than nhc is in their own track, good luck with the marine lab

[meteorologyman]

I like to compare this with katrina.
I would also like to compare it with Pacific storm typhoon tip.
As far as size goes,
obviously those storms were stronger then Hanna is curently now

[MiamiensisWx]

I like to compare this with katrina.
I would also like to compare it with Pacific storm typhoon tip.
As far as size goes,
obviously those storms were stronger then Hanna is curently now

Hanna's wind radii is not even remotely close to those TCs...

[Trader Ron]

I like to compare this with katrina.
I would also like to compare it with Pacific storm typhoon tip.
As far as size goes,
obviously those storms were stronger then Hanna is curently now

Tip was 1380 miles in diameter with 190 MPH winds