Jeanne: Florida Landfall Increasingly Likely

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donsutherland1
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Jeanne: Florida Landfall Increasingly Likely

#1 Postby donsutherland1 » Thu Sep 23, 2004 5:40 pm

NOTE: This was reposted as a separate message, as I accidentally posted it in another thread. Apologies for the duplication.

Consistent with my thinking all along, things continue to point toward a Florida landfall for Hurricane Jeanne.

At 5 pm, Hurricane Jeanne was centered at 25.9N 70.3W and had been heading generally west-northwest over the past 12 hours (293° from 25.6N 69.5W to 25.9N 70.3W).

As high pressure begins moving offshore over the next 12-24 hours, I believe Jeanne will take on an increasingly west track and possibly a tad to the south, as well.

The following is an animation of the European Model, which was spectacular in calling the timing of Jeanne's turn back to the west from 4 days out:

Image

A general west track should be sustained until Jeanne nears landfall or possibly just after she makes landfall (I believe that she will be heading between west-northwest and northwest upon landfall). Overall, I believe Jeanne could get as far west as 81.5W to 84.5W depending on her forward speed and the rate at which the high pressure moves farther offshore.

Early on, I believe Ivan will likely take the following track and this idea is quite close to the NHC track though increasingly south of it toward the end of the period:

25.8N 72.5W
25.8N 73.5W
25.7N 75.0W
26.0N 77.5W
27.0N 80.0W

At this time, such a track has the support of a number of the computer models, including the NOGAPS, GFS, and UKMET.

I also believe that Jeanne will make landfall as a Category 2 hurricane with some chance at making landfall as a Category 3 strength. In 48 hours, the SHIPS Model brings Jeanne's maximum winds up to 120 mph. After 72 hours, it eases the winds to 113 mph.

If Jeanne were to make landfall as a Category 3 storm, 2004 would become the first year since 1955 in which 3 major hurricanes made landfall. It would also become the first year since 1950 in which two major hurricanes made landfall at Florida (Ivan came ashore at Gulf Shores, AL and registered as a "hit" but not landfall at Florida).
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#2 Postby Josephine96 » Thu Sep 23, 2004 5:43 pm

Nice comp. graphic.. All us Floridians need to stay safe..
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#3 Postby dixiebreeze » Thu Sep 23, 2004 5:47 pm

Thanks for the excellent analysis and graphics, DonSoutherland1. I think if Jeanne maintains Cat. 2 or 3 status before landfall, she is likely to travel farther into the interior of Florida before her turn. At any rate, I'm replenishing my water supply Friday.
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#4 Postby HurricaneQueen » Thu Sep 23, 2004 5:57 pm

Exactly, Dixie. The faster it comes. the more west it should come before making the northerly turn. Unfortunately, it will cover a lot more real estate that way. Ugh! Sure wish it had one more loop de loop up its sleeve before heading west!

Lynn

BTW, after reading about the fre,nzied buying on the east coast, I couldn't help but notice that most parking lots and gas stations were empty here this evening. No one at work is taking it very seriously either and I am tired of preaching so unless I'm asked, I never even mention Jeanne and even then just warn them to watch the local weather. My guess is everyone will be quite aware by morning.

Lynn
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#5 Postby donsutherland1 » Thu Sep 23, 2004 6:00 pm

Thanks Dixiebreeze and Josephine96.

I agree with you Dixiebreeze. The stronger Jeanne is at landfall, the more likely she will take a wider turn and punch farther west. That's part of the reason I suggested she could get as far as 81.5W-84.5W.

Hopefully, Floridians will be prepared and also Jeanne will weaken appreciably prior to landfall.
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#6 Postby rainstorm » Thu Sep 23, 2004 6:11 pm

i agree. my feeling is with no big trough to turn jeanne, the stronger jeanne becomes the more the high builds and the further west it goes. 84.5 is not out of the question
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#7 Postby WXBUFFJIM » Thu Sep 23, 2004 6:48 pm

We got a ridge north of Jeanne, hence the landfall most likely over central and or southeast Florida, similar to that of Frances, except possibly stronger or a major hurricane of 120 mph.

Jim
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#8 Postby cape_escape » Thu Sep 23, 2004 7:04 pm

HurricaneQueen wrote:Exactly, Dixie. The faster it comes. the more west it should come before making the northerly turn. Unfortunately, it will cover a lot more real estate that way. Ugh! Sure wish it had one more loop de loop up its sleeve before heading west!

Lynn

BTW, after reading about the fre,nzied buying on the east coast, I couldn't help but notice that most parking lots and gas stations were empty here this evening. No one at work is taking it very seriously either and I am tired of preaching so unless I'm asked, I never even mention Jeanne and even then just warn them to watch the local weather. My guess is everyone will be quite aware by morning.

Lynn


Hi again neighbor! Things are pretty much the same here.
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#9 Postby hurricane1020 » Thu Sep 23, 2004 7:24 pm

im in the cape too and if she makes it to 84.5 w then what do you think we would get?
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#10 Postby cape_escape » Thu Sep 23, 2004 7:48 pm

hurricane1020 wrote:im in the cape too and if she makes it to 84.5 w then what do you think we would get?


According to Sanibel, not much more than we got from Frances.
Don't quote me on that thou, because that wasn't with the 84.5 coordinates.
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#11 Postby hurricane1020 » Thu Sep 23, 2004 7:54 pm

the weather guys on wink and abc are not really saying too much about this they made more of a big deal with frances and if this gets to 84.5 or even 83w i would think we would feel more then frances
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#12 Postby cape_escape » Thu Sep 23, 2004 8:16 pm

hurricane1020 wrote:the weather guys on wink and abc are not really saying too much about this they made more of a big deal with frances and if this gets to 84.5 or even 83w i would think we would feel more then frances


I agree! The one thing I did hear on NBC was something about landfall around Ft Lauderdale, and that we will see some wind...
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Re: Jeanne: Florida Landfall Increasingly Likely

#13 Postby donsutherland1 » Fri Sep 24, 2004 2:04 pm

As of 2 pm, Hurricane Jeanne was centered at 26.3N 72.9W and continuing to head almost due west. At this point in time, she is running just to the north of the track outlined last evening:

25.8N 72.5W Actual: 26.2N 72.5W
25.8N 73.5W
25.7N 75.0W
26.0N 77.5W
27.0N 80.0W

With a more or less due west track likely through the rest of today and the synoptic situation little changed from yesterday, I will leave the track unchanged. I'm continuing to favor a track somewhere along the lines of the latest runs of the NOGAPS and UKMET until and shortly after a Florida landfall.

After this evening's model guidance, I'll likely add another coordinate or two. If necessary, I might refine the earlier ideas, but I don't expect substantial changes from what I'm seeing right now.

Finally, I expect Jeanne's slow weakening to level off perhaps this evening. Afterward some strengthening is possible, especially as she moves over somewhat warmer waters and the dry air that has been harrassing her diminishes somewhat.

SSTs:
http://www7300.nrlssc.navy.mil/altimetr ... at_sst.gif

SST Anomalies:
http://www7300.nrlssc.navy.mil/altimetr ... _sst.a.gif

Overall, I'm still expecting her to make landfall as a Category 2 hurricane. There is some possibility that she could be a Category 3 storm upon landfall.
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Re: Jeanne: Florida Landfall Increasingly Likely

#14 Postby donsutherland1 » Fri Sep 24, 2004 4:46 pm

At 5 pm, Hurricane Jeane was centered at 26.4N 73.5W and heading generally westward at 12 mph. She had maximum sustained winds of 100 mph.

She has been maintaining a mainly westerly track through the day:

Track for 12-Hour Periods Ended:
9/24 12z 273° West
9/24 12z 273° West
9/24 18z 275° West
9/24 21z 277° West

This motion should continue through much of tomorrow as she rides under a strong ridge as depicted quite well on the European Model:

Image

In fact, I believe she will probably head closer to 270° than 280° for the next 12-18 hours.

Consequently, the only refinements in my estimated track from last night is for the earlier portion to incorporate her position farther to the north than anticipated. The latter part of the track remains unchanged:

Estimated Track from Thursday (9/23) Evening:
25.8N 72.5W Actual: 26.2N 72.5W
25.8N 73.5W Actual: 26.4N 73.5W

My Estimated Track through 30.0°N:
26.5N 75.0W
26.5N 77.5W
27.0N 80.0W
30.0N 82.0W

At this time, my thinking remains that Jeanne could get as far west as 81.5W to 84.5W depending on her forward speed and the rate at which the high pressure moves farther offshore. The faster she heads west and the stronger she grows, the more likely a wider turn will result.

Finally, based on the latest environment Jeanne is likely to experience as she heads for a Florida landfall, I continue to believe that Jeanne will make landfall as at least a Category 2 hurricane. There remains a real chance she could make landfall as a Category 3 storm.
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#15 Postby cape_escape » Fri Sep 24, 2004 4:49 pm

Thanks for the update!
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#16 Postby donsutherland1 » Fri Sep 24, 2004 5:04 pm

You're welcome, Cape_escape. I wish I had better news for Florida.
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#17 Postby donsutherland1 » Sat Sep 25, 2004 10:11 am

Hurricane Jeanne Becomes Season’s 6th Major Hurricane

At the 11 am advisory, Hurricane Jeanne was located at 26.6N 77.6W and continuing to head west. In addition, her top sustained winds had increased to 115 mph, making her the 6th major hurricane of the 2004 season. The 2004 hurricane season is just the 8th season on record in which there have been 6 or more major hurricanes:

1950.....8
1961.....7
1916.....6
1926.....6
1955.....6
1964.....6
1996.....6
2004.....6

In terms of her track, Jeanne has behaved extremely well and continues to take a track very close to 270° or due west. That should continue through much of today.

Track for 12-Hour Periods Ended:
9/25 3z 275° West
9/25 6z 273° West
9/25 9z: 272° West
9/25 12z: 270° West
9/25 15z: 272° West

Estimated Track from Friday (9/24) Night:

26.5N 75.0W Actual: 26.5N 75.0W
26.5N 77.5W Actual: 26.6N 77.5W
27.0N 80.0W
30.0N 82.0W

As noted previously, I remain concerned that Jeanne could get as far west as 84.5°W. If that looks more likely, the figure for 30.0N 82.0W would likely need to be adjusted. By this evening, I’ll have a better idea on this.

For now, the area with the highest probability of seeing Jeanne's landfall ranges from Fort Lauderdale to Vero Beach. Most likely, landfall will probably occur within 35 miles of West Palm Beach.

It should also be noted that the odds of Jeanne’s making landfall as a major hurricane (Category 3 or above) have increased since yesterday. It should be noted that many of the strongest hurricanes to make U.S. landfall were heading in a west, west-northwest, or northwest direction upon landfall. Among those hurricanes was devastating Hurricane #6 (1926). Jeanne should be heading west-northwest while making a slow turn to the northwest upon landfall.

If Jeanne makes landfall as a major hurricane, 2004 will be only the fourth year that 3 major hurricanes have made U.S. landfall:

1909: 1 Category 4 hurricane; 2 Category 3 hurricanes
1954: 1 Category 4 hurricane; 2 Category 3 hurricanes
1955: 3 Category 3 hurricanes

At the same time, if Jeanne makes landfall as a major hurricane, 2004 would be the first year since 1950 in which two major hurricanes made landfall in Florida (Easy and King). Ivan made landfall at Gulf Shores, Alabama and constitutes a Florida “hit” but not Florida landfall.

Finally, the 5 am EDT NHC discussion stated:

IT WOULD NOT BE A SURPRISE TO SEE JEANNE GET STRONGER
THAN THAT...AND REACHING CATEGORY FOUR STATUS IS NOT OUT OF THE
QUESTION.


Based on an examination of past Category 4 or stronger hurricanes, some milestones to look for if Jeanne is to enter a rapid intensification phase that would take her to Category 4 status:

• 947 mb or lower by 2 pm, or
• 945 mb or lower by 5 pm
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#18 Postby Innotech » Sat Sep 25, 2004 10:21 am

Jeanne landfalling in FLorida is practically guaranteed at this point....
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#19 Postby donsutherland1 » Sat Sep 25, 2004 10:26 am

I completely agree, Innotech.
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#20 Postby donsutherland1 » Sat Sep 25, 2004 7:25 pm

As of 8 pm, Hurricane Jeanne was centered at 27.1N 79.3W and continuing to track mainly to the west.

My revised estimates based on this position and model guidance suggest that by 30.0N, Jeanne will be farther west than I had initially estimated, though well within the 81.5W-84.5W bound outlined several days ago.

Consequently, I have refined my position for 80.0W and adjusted the 30.0N one as follows:

27.2N 80.0W Landfall very close to Stuart, Florida
30.0N 83.2W

For what it is worth, I'll also score last the Friday night track estimates from which the landfall idea appears likely to have been remarkably close to what now appears likely.

Estimated Track from Friday (9/24) Night:

26.5N 75.0W Actual: 26.5N 75.0W
26.5N 77.5W Actual: 26.6N 77.5W
27.0N 80.0W
30.0N 82.0W
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