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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701. WPBHurricane05 11:50 PM GMT en Agosto 27, 2006    
bayoubug...i dont see an ULL over the bahamas, we wish it would shear, but Ernesto would have to be on the east of it to get sheared
Member Since: Julio 31, 2006 Posts: 56 Comments: 7929
702. will40 11:50 PM GMT en Agosto 27, 2006    
ok everyone spam da Punk
Member Since: Septiembre 19, 2005 Posts: 2 Comments: 3439
703. longislandxpress 11:50 PM GMT en Agosto 27, 2006    
If it is a slow crawer, that would be a killer, but some mid strength storms are real weak like this one even when it develops. Well have to see, but even the bad track might not be so bad. Fingers crossed.
705. longislandxpress 11:51 PM GMT en Agosto 27, 2006    
oops, I mean weak on the west side , sorry.
706. ClearH2OFla 11:51 PM GMT en Agosto 27, 2006    
Im back ty storm junkie
707. PBG00 11:51 PM GMT en Agosto 27, 2006    
Because for the most part..the people with the insight we trust are here(at leaste for me anyway)
Member Since: Octubre 20, 2005 Posts: 14 Comments: 6650
708. HurricaneRoman 11:52 PM GMT en Agosto 27, 2006    
scla a jog is just a jog!
Member Since: Febrero 25, 2006 Posts: 2 Comments: 958
709. Patrap 11:52 PM GMT en Agosto 27, 2006    
..sees Ernesto making a good comeback in building the CDO..around a tightening coc.The Cyclone in the process has shifted somewhat to the wnw during this period.About the last 2hrs.Although some of the motion could be derived from the tightening infloe .the motion has been consistent the last hour.around 291 @ 7-8mph. Ernesto still gives a good overall look to his outflow..and the ULL to its north that has been its lead the past 12.Is having less northward pull on the system.More observation is needed to see if the new motion is transitory..or a trend .
Member Since: Julio 3, 2005 Posts: 372 Comments: 111605
713. seminolesfan 11:52 PM GMT en Agosto 27, 2006    
Posted By: cyclonebuster at 11:42 PM GMT on August 27, 2006.
I love how the initial positions on that map above are all in different locations!!


The run times for each model are very different. Details CB, gotta mind the details.
Member Since: Junio 14, 2006 Posts: 0 Comments: 1720
714. WPBHurricane05 11:52 PM GMT en Agosto 27, 2006    
where is cantore headed for
Member Since: Julio 31, 2006 Posts: 56 Comments: 7929
716. bayoubug 11:53 PM GMT en Agosto 27, 2006    
sorry just east of the bahamas..
Member Since: Julio 25, 2006 Posts: 0 Comments: 157
718. tampagirl 11:53 PM GMT en Agosto 27, 2006    
ClearH20Fla- this is a little bit frightening, isn't it? Not sure how much this area could sustain. We get killed on a good thunderstorm.
721. sporteguy03 11:53 PM GMT en Agosto 27, 2006    
Hey Jp,
Nice to see ya waiting to see if Tom Terry has a weigh in on Ernesto, hes good at this stuff.
Member Since: Julio 7, 2005 Posts: 0 Comments: 4824
722. hurricaneman23 11:53 PM GMT en Agosto 27, 2006    
does it look to be intensifiying right now?
724. WPBHurricane05 11:53 PM GMT en Agosto 27, 2006    
cyclonebuster, that is an idiotic thing to say, because 1. i live in West Palm Beach, and 2. what would make you say that
Member Since: Julio 31, 2006 Posts: 56 Comments: 7929
725. Joshfsu123 11:54 PM GMT en Agosto 27, 2006    
I was expecting the GDFL to switch to the east.... that makes 3 models that have landfall about 50 miles north of Tampa or about 100 miles SE of Tallahassee. That seems reasonable.

Similar to Charley though, unexpected turns can happen. This storm could continue north a little longer and threaten the Big Bend or it could move into South Florida and threaten Punta Gorda again.

Florida's west coastline is such that a 50 mile change in path (which isn't a lot) could cause a major difference in the strength and the location of where it hits.

The 2am and 8am model runs tomorrow should tell us a lot.

Also, Ernesto is moving WNW for the most part, a little more west than expected. This is good news as a NW path would allow it to cross Cuba much quicker than forecasted.
Member Since: Julio 6, 2005 Posts: 5 Comments: 575
726. BahaHurican 11:54 PM GMT en Agosto 27, 2006    
On flying over Cuba and whether they would notice, Cuba does have radar and stuff. The met people seem to be able to interact w/ US sufficiently to share info. I dunno about military planes, even HH, overflying, though. IF the gov. did allow it, it would prolly only be the NOAA plane, which is (I am assuming) techically not military.

OTOH, the Cuban military does have a rep. for shooting first and talking about it only if necessary . . . .

So I'd say no fly-overs, but possibly radar info and whatever native observations are taken may be made available via WMO . . .
Member Since: Octubre 25, 2005 Posts: 19 Comments: 17673
727. Cavin Rawlins 11:54 PM GMT en Agosto 27, 2006    
There's an ULL over the Bahamas?
Member Since: Julio 24, 2005 Posts: 407 Comments: 19076
728. drbrad 11:54 PM GMT en Agosto 27, 2006    
NOT SCREAMING OR ANYTHING, JUST SEEMS EASIER TO GET READ.........

I'd like to see people list their reasons why they think the storm will do what their opinion is. If it's a wild guess, then great! At least we'll know it.

Here's what I think and I could be totally off the mark but........

I think the storm will start moving westward or wnw because on the water vapor loop, it looks like the northern most bands, as they are expanding toward the north, are running into the high(clockwise circulation anyway). This seems to me to be redirecting them to the west. That motion seems to carry it possibly to the west of Cuba at this point. It looks to me like the part that is anchored over Georgia would maintain itself for several more days.

Also, the low that seemed to be blocking it's westward progression has moved over Mexico.

I think it will go west/wnw over the next 12 hours.

No need for screaming, just my opinion and the reasons. I know most think it's going more N I'd like to know WHY they think it.
Member Since: Junio 3, 2006 Posts: 0 Comments: 7
729. longislandxpress 11:54 PM GMT en Agosto 27, 2006    
Miami, FT lauderdale, West Palm Beach, St. Lucie,Cape Canaveral, Daytona and Tallahassee could be wiped out with this storm."

What makes you think it will be so powerful? I see a frances at best.( with a big eye)
730. mybahamas 11:54 PM GMT en Agosto 27, 2006    
Hiya from Nassau, The Bahamas. :)
I'm watching Ernesto with great interest; but I know of very few other persons here who are doing the same. :(
Wishing all the best during this season.
731. scla08 11:54 PM GMT en Agosto 27, 2006    
HurricaneRoman, i'm not going to argue with you. But a "jog" can throw off the track a little.. maybe not much, but it definately can..
Member Since: Julio 24, 2006 Posts: 0 Comments: 272
732. HurricaneRoman 11:54 PM GMT en Agosto 27, 2006    
I don't see the jog look at the overall storm and u will see it is right on track ... i hope im wrong :/
Member Since: Febrero 25, 2006 Posts: 2 Comments: 958
733. WPBHurricane05 11:54 PM GMT en Agosto 27, 2006    
hi stormw, whats your take on Ernesto
Member Since: Julio 31, 2006 Posts: 56 Comments: 7929
734. 1900hurricane 11:55 PM GMT en Agosto 27, 2006    
Man.....what happened to Ernie? He isn't looking as good as he was this morning! There's been almost a 20 mb. pressure rise!
Member Since: Agosto 2, 2006 Posts: 43 Comments: 10366
736. hurricaneman23 11:55 PM GMT en Agosto 27, 2006    
looks like ernesto is heading nw not wnw or w at all
737. ClearH2OFla 11:55 PM GMT en Agosto 27, 2006    
Hey tampagirl i agree we flood over here if a cloud snezzes. I think we will be ok though
738. WPBHurricane05 11:55 PM GMT en Agosto 27, 2006    
456..no
Member Since: Julio 31, 2006 Posts: 56 Comments: 7929
739. SWFLdrob 11:55 PM GMT en Agosto 27, 2006    
I think the blowup heading W or WSW is not where the COC is. There's a bright red blowup on the north side of that stick of land attached to the rest of Haiti. I think the actual COC either crossed there or is reforming near there.

I'm probably way wrong and you guys will tell me so...but nevertheless...what do you guys think?

Link
742. WPBHurricane05 11:56 PM GMT en Agosto 27, 2006    
my post are posting like 5 minutes after I hit 'POST COMMENT'
Member Since: Julio 31, 2006 Posts: 56 Comments: 7929
743. WPBHurricane05 11:58 PM GMT en Agosto 27, 2006    
whirlwind..thats an idiotic thing to say

tonight i feel like a broken record, i think im gonna leave
Member Since: Julio 31, 2006 Posts: 56 Comments: 7929
744. Patrap 11:58 PM GMT en Agosto 27, 2006    
.in the wv the ULL is small ..but has been the effect that had drawn Ernie N of the track.Evryone thought the tuckULL to its west yesterday would slide west.And it did.But the effectof the ULL in the Bahamas..wasnt picked up on till the effects were in p-lay..Now it is disconnecting from that influence..thus the wnw..recent movement..
Member Since: Julio 3, 2005 Posts: 372 Comments: 111605
745. Barkeep1967 11:59 PM GMT en Agosto 27, 2006    
I think this is an issue for Florida and only florida; not sure about landfall yet

Maybe Florida is the highest probability right now but everybody from Mexico to the Keys need to keep an eye out.
Member Since: Junio 26, 2006 Posts: 0 Comments: 193
746. PBG00 11:59 PM GMT en Agosto 27, 2006    
I think this Ernesto is going right up the East coast of FLA.Bye! Bye! East coast!!

I was referring to the last few posts of cyclonebuster, JP
Member Since: Octubre 20, 2005 Posts: 14 Comments: 6650
747. 1900hurricane 11:59 PM GMT en Agosto 27, 2006    
Ernie doesn't want to be a weakling! Look at the thunderstorm explosion near the end of this loop.
Member Since: Agosto 2, 2006 Posts: 43 Comments: 10366
748. sporteguy03 11:59 PM GMT en Agosto 27, 2006    
I hope Dr.Masters can talk about the HH lack of ability to fly to Cuba in his blog....I wonder what his thoughts are.
Member Since: Julio 7, 2005 Posts: 0 Comments: 4824
750. sails1 11:59 PM GMT en Agosto 27, 2006    
Ernesto's eye re-forms to the north of the western tip of Haiti. Does anyone agree with this?
Member Since: Mayo 26, 2003 Posts: 0 Comments: 72
751. whirlwind 11:59 PM GMT en Agosto 27, 2006    
sorry... its the excitement building...... i shall refran

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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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