Dr. Jeff Masters' WunderBlog

Haiti weakens Ernesto
Posted by: Dr. Jeff Masters, 8:13 PM GMT en Agosto 27, 2006 +0
Ernesto is has been clobbering Hispanolia all morning with tropical storm force winds and torrential rains. But now, the island has bitten back. Ernesto is struggling to hold his eye together, thanks to the mountainous terrain on the southwestern peninsula of Haiti. The 1:10pm and 3pm EDT Hurricane Hunter eye reports found a surface pressure estimated at 1007 mb, a big increase from this morning's 995 mb. Moreover, the eye was substantially tilted, with the calm at the surface about 25 miles south of the calm at the 10,000 foot flight level. The plane could find maximum winds of only 35 mph during that 2-hour period, so Ernesto will probably be downgraded to a tropical storm with the 5pm advisory. The center of the storm is just south of some very mountainous terrain, and this is significantly disrupting Ernesto. The upper level outflow still looks strong, wind shear is weak, and an upper-level anticyclone (clockwise-rotating region of winds) is still in place, so Ernesto will no doubt reorganize tonight once he moves away from Haiti. However, given Ernesto's small size and the difficultly he is having with Hispanolia, there is hope that the expected 1-2 day traverse of Cuba will significantly weaken him. It may take Ernesto a day or two to regain hurricane strength once he emerges into the Florida Straits. This bodes well for the Florida Keys, which may dodge another hurricane. I think that only if Ernesto makes landfall north of Tampa will he have time to organize into a major hurricane.

The Keys evacuate
Monroe County emergency management is taking no chances, and has ordered a mandatory evacuation of all visitors and non-residents in the Florida Keys beginning at 1 pm this afternoon. A local state of emergency has been declared by Monroe County at noon today. All County and state Parks are encouraged to close this afternoon. At 10 am Monday, an evacuation for all mobile home residents will go in effect.


Figure 1. A view of the southwestern peninsula of Haiti, looking towards Cuba. Note the mountainous terrain and totally denuded of trees. Deforestation in Haiti has claimed over 99% of all the forests. The lack of forest cover to absorb Ernesto's torrential rains will cause deadly floods throughout southern Haiti today and Monday. Image credit: Google Earth.

The intensity forecast
There is no major change to the intensity forecast. As long as Ernesto is not interacting with Cuba or Hispanolia, he should strengthen. A low-shear environment with an upper-level anticyclone (clockwise rotating region of winds) has developed on top of the storm. These conditions are highly favorable for intensification. Ernesto is over waters of 30-31 C (86-88 F), and these waters warm up to nearly 90F in the narrow channel between Jamaica and Cuba. These warm waters extend to great depth, and the total heat content available to fuel rapid intensification is high. However, given the sharp decrease in intensity of Ernesto, thanks to its interaction with Hispanolia, I no longer expect Ernesto will have enough time to reorganize and attain Category 2 status for its Cuba landfall. Expect a Category 1 hurricane.

The track forecast
The 12Z (8am EDT) models are in, and continue to show Florida will get a double hit--first the Keys, then the main Peninsula. The GFDL model is the furthest west, favoring a hit in the Panhandle as a Category 3 hurricane. The GFS is the farthest east, calling for a hit on Key Largo as a tropical storm. The other models are in between. At this point, there is no reason to disqualify any of these model solutions as unreasonable. It still appears that New Orleans can breathe easy, as Ernesto should miss that city by a wide margin. However, residents of the U.S. southeast coast need to be prepared for tropical storm conditions if Ernesto crosses Florida and then re-intensifies off the Southeast coast. Several of the models indicate a track curving along the Southeast Coast just offshore, which may bring tropical storm conditions to Georgia, South Carolina, and North Carolina. Ernesto is not a threat to New England.

The storm surge forecast
Ernesto should not generate as high of storm surge in the Keys as Hurricane Wilma did last year. Storm surge heights should be four feet or less. Cuba will block the formation of the mound of storm surge water that Ernesto is piling up today and Monday, and the storm will have to generate a new mound of storm surge water once it crosses into the Florida Straits. North of the Keys, any hit along the west coast of Florida as a Category 2 or higher storm will generate a 10 foot or higher storm surge, due to the shallow waters extending out for a great distance from the coast.

Next update
The Hurricane Hunters will be in Ernesto until about 5pm EDT this afternoon. The next mission is at 8pm EDT tonight. The NOAA jet is scheduled to fly tonight as well, so we'll have our first set of higher-reliability model runs Monday morning. The NOAA P-3 gets its first action Monday morning, and will fly their SFMR instrument that measures surface winds over the entire area. I may have a short update tonight if there's a significant change to report, otherwise I'll see you in the morning.

Jeff Masters
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1352. Joshfsu123 3:15 AM GMT en Agosto 28, 2006    
People in Florida, from Pensacola to Miami, should continue to keep a close eye on the progress of this system. Model runs at 2am and 8am will include samplings from the surrounding environment and they will provide us a better idea on where this system is going. However, I do not expect any significant changes in the forecast track. (Maybe a little north and west of current projections.)

Probabilities:

West(Tampa)/Southwest(Punta Gorda) Coast of Florida: (60%)
North Eastern Florida(Big Bend): (25%)
Atlantic Ocean(Missing Florida): (10%)
North Central Gulf: (5%)
Texas: (0%)
Mexico: (0%)
Member Since: Julio 6, 2005 Posts: 5 Comments: 575
1353. dads1boss 3:15 AM GMT en Agosto 28, 2006    
1354. HurryKaneKata 3:15 AM GMT en Agosto 28, 2006    
What about if ernesto intensifies and goes around Cuba on the east side of the Island and then goes by the florida keys into the gulf of Mexico and gets to a Cat.5 Hurricane and hits padre island?
1355. Crisis57 3:15 AM GMT en Agosto 28, 2006    
i agree with you ike it looks more northward movement
1357. sporteguy03 3:16 AM GMT en Agosto 28, 2006    
So the Noaa Jet data improves the accuracy of the models or does it still leave many questions?
Member Since: Julio 7, 2005 Posts: 0 Comments: 4840
1358. StormMan 3:17 AM GMT en Agosto 28, 2006    
And this too.

http://media.maps.com/magellan/images/eHAI-W.gif

terrain

As you can see, lots to help neutralize the eye so the 'warm water' between Haiti and Cuba SE coast will be of little actual value to storm intensity, at least that's what it looks like is happening.

-StormMan
Member Since: Agosto 15, 2005 Posts: 0 Comments: 51
1359. Joshfsu123 3:18 AM GMT en Agosto 28, 2006    
It should improve the accuracy of the models.
Member Since: Julio 6, 2005 Posts: 5 Comments: 575
1361. thelmores 3:19 AM GMT en Agosto 28, 2006    
the LLC appears to me to be appraching the west side of the convection, and is close to becoming exposed.... i think! LOL
Member Since: Septiembre 8, 2005 Posts: 0 Comments: 3754
1362. dads1boss 3:19 AM GMT en Agosto 28, 2006    
a href="http://www.weather.com/weather/map/32583?from
hey look


=36hour_map_large" target="_blank">Link
1363. kmanislander 3:20 AM GMT en Agosto 28, 2006    
sporteguy
the NOAA jet samples the environment at high altitude whereas the HH is primarily a low altitude invest
the combination of the two gives a nore precise picture of the entire atmospheric environment around the storm thus leading to better model runs
if I have this wrong someone will no doubt correct me
LOL
Member Since: Agosto 19, 2006 Posts: 0 Comments: 14988
1364. will40 3:21 AM GMT en Agosto 28, 2006    
it will also help the NHC have a better look for their next advisory
Member Since: Septiembre 19, 2005 Posts: 2 Comments: 3462
1365. dads1boss 3:21 AM GMT en Agosto 28, 2006    
1366. Joshfsu123 3:21 AM GMT en Agosto 28, 2006    
well, the storm is looking really bad now. I am going to bed but will get up around 3/4am to check the 2am model runs and see how/what the storm is doing, if anything.

night
Member Since: Julio 6, 2005 Posts: 5 Comments: 575
1367. sporteguy03 3:21 AM GMT en Agosto 28, 2006    
Tom Terry's What to expect:
Next 12 hours over Cuba are critical

NOAA Jet data input in models

Stronger High in Bahamas more Westward Shift

Sums it up perfectly!
Member Since: Julio 7, 2005 Posts: 0 Comments: 4840
1368. HurricaneRoman 3:23 AM GMT en Agosto 28, 2006    
remember that the nhc can't predict rapid intesification... this thing could hit florida anywhere from a TD to mayb even a cat 4
Member Since: Febrero 25, 2006 Posts: 2 Comments: 958
1369. HurricaneRoman 3:23 AM GMT en Agosto 28, 2006    
i hope the track shifts west tonite i will wake up at 6
Member Since: Febrero 25, 2006 Posts: 2 Comments: 958
1370. dads1boss 3:24 AM GMT en Agosto 28, 2006    
1371. Crisis57 3:25 AM GMT en Agosto 28, 2006    
anyone think the track might shift a little more to the east?
1372. ClearH2OFla 3:25 AM GMT en Agosto 28, 2006    
Good nite all
1373. theBlur 3:26 AM GMT en Agosto 28, 2006    
H2O -

You may be right, except that the storm may even track further east.
1374. 2COOL 3:26 AM GMT en Agosto 28, 2006    
meaning of Ernesto: noble and famous in battle. Let's see how is does battling land now.
Member Since: Mayo 26, 2006 Posts: 0 Comments: 22
1375. NWAtlanticCyclone 3:26 AM GMT en Agosto 28, 2006    
Yeah I agree with the northward movement and relocation of his center I can expect to be further north. If Ernesto can form his coc further north he can avoid Cuba and get out of the Caribbean Sea and then it becomes a whole new ball game. He will then take a more westward path from the influence of the high pressure ridge over the Bahamas. The ull to the north will pull on Ernesto and thats how he gets above Cuba. He will enter the Fl. Straights and reintensify over the warmer waters. Ernesto will then enter the SE Gulf of Mexico. Then at this point it is very possible the front will miss him if this turns out to be right during the next 36 to 72 hours. Then from there on who knows.
1376. thelmores 3:26 AM GMT en Agosto 28, 2006    
Member Since: Septiembre 8, 2005 Posts: 0 Comments: 3754
1378. BahaHurican 3:27 AM GMT en Agosto 28, 2006    
I don't know about the rest of u guys, but the W portion of that NW motion is not showing itself. What I notice is - once again - a Nward jump in the CoC, bringing much closer to an earlier exit from Cuba. If it gets out into the Old Bahama Channel just south of Ragged Island, we could see some serious problems. Water there is cooler than S of Cuba, but still warm enough to give Ernesto a considerable boost. Plus this would put it out of interference from any serious land mass for a good 24 hours, more than long enough to strengthen considerably. If it DOES make this short trip, everybody better pray that trough flies down fast enough to force Ernesto east before it can get to the Gulf . . ..

Not that I really want it to come this way; most people here really have been expecting it to stay on the south side of Cuba and out of our hair . . . .
Member Since: Octubre 25, 2005 Posts: 19 Comments: 17961
1379. Crisis57 3:28 AM GMT en Agosto 28, 2006    
to me looking at the storm and the NHC track the storm seems to be a little more to the right of the track maybe its just me
1380. dads1boss 3:29 AM GMT en Agosto 28, 2006    
1381. Crisis57 3:29 AM GMT en Agosto 28, 2006    
i agree bahahurican its looks like another northward jog
1382. will40 3:29 AM GMT en Agosto 28, 2006    
i agree JP the darn little sneak has got eyes
Member Since: Septiembre 19, 2005 Posts: 2 Comments: 3462
1383. BahaHurican 3:30 AM GMT en Agosto 28, 2006    
Thelmores,

Why does that map show Cockburn Town down in the Turks and Caicos???? That's well north and west, on San Salvador . . . .
Member Since: Octubre 25, 2005 Posts: 19 Comments: 17961
1384. NWAtlanticCyclone 3:30 AM GMT en Agosto 28, 2006    
Trough will miss then a possible Rita situation on our hands. No time for panic just suggesting what could happen if this does play out. I'm off to bed. 11:30pm 8/27/06
1385. HurricaneRoman 3:31 AM GMT en Agosto 28, 2006    
I think the nhc has it over cuba too much, i would move it to the right about 50-75 miles...
Member Since: Febrero 25, 2006 Posts: 2 Comments: 958
1386. dads1boss 3:31 AM GMT en Agosto 28, 2006    
Take a look our own land hurricaneLink
1387. sporteguy03 3:31 AM GMT en Agosto 28, 2006    
JP,
Why the increase in forward speed?
Member Since: Julio 7, 2005 Posts: 0 Comments: 4840
1388. thelmores 3:31 AM GMT en Agosto 28, 2006    
dont look now..... WE HAVE A BURST OF CONVECTION "NEAR THE CENTER"


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1389. franck 3:31 AM GMT en Agosto 28, 2006    
The Haitian hills stole most of Ernesto's mojo. Will he get it back? Stay tuned.
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1390. kmanislander 3:32 AM GMT en Agosto 28, 2006    
bb tomorrow
gnite all
Member Since: Agosto 19, 2006 Posts: 0 Comments: 14988
1393. Crisis57 3:32 AM GMT en Agosto 28, 2006    
i agree with you on that hurricaneroman i think way to much over cuba and you can clearly see it jogged north again
1394. pseabury 3:33 AM GMT en Agosto 28, 2006    
Great Satellite Tool

This is my favorite because if you hover your mouse over the section at the top marked "Slider" you can manually control which frame shows just by moving your mouse side to side. This lets you go both forward and in reverse with almost no effort, and in a smooth manner.

I find that especially by looking at it in reverse it's easier to find the COC.
Member Since: Mayo 28, 2005 Posts: 0 Comments: 3
1395. will40 3:33 AM GMT en Agosto 28, 2006    
nite kman
Member Since: Septiembre 19, 2005 Posts: 2 Comments: 3462
1396. nola70119 3:33 AM GMT en Agosto 28, 2006    
I think Ernesto is done.
Member Since: Junio 16, 2006 Posts: 0 Comments: 1535
1398. BahaHurican 3:34 AM GMT en Agosto 28, 2006    
Eyes on all sides LOL.

Not that this is anything new; wasn't it Ivan that avoided every land mass, even making landfall in the largest inlet it could find in the GoM?? I remember it was forecast to go in at the Mississippi Delta, only it veered off to find Mobile Bay . . . .
Member Since: Octubre 25, 2005 Posts: 19 Comments: 17961
1399. cat1cane 3:34 AM GMT en Agosto 28, 2006    
I just checked my forecast for the week on the NWS site and weather.com. The NWS site has wind gusts to 105 mph on Wednesday night, while weather.com has 7mph winds. Bizarre.
1400. JM2 3:35 AM GMT en Agosto 28, 2006    
Take a look at the water vapor loop: http://www.ssd.noaa.gov/goes/east/watl/loop-wv.html notice how everything over FL is moving to the west? Ernesto will continue to track NW overall under this influence. It might go north for a few hours then swing west for awhile thus overall you get a NW motion. Normally little jogs like this mean nothing in a storm two days away from a US landfall but in this case it makes all the difference due to the interaction with moutains in Cuba. This is a tricky little storm.

I'm in the middle of the cone and will post updates as needed: http://www.wunderground.com/blog/JM2/show.html
1401. will40 3:36 AM GMT en Agosto 28, 2006    
yea Baha these things are sooooooooooo amazing
Member Since: Septiembre 19, 2005 Posts: 2 Comments: 3462

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About JeffMasters
Jeff co-founded the Weather Underground in 1995 while working on his Ph.D. He flew with the NOAA Hurricane Hunters from 1986-1990.

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