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
  Permalink | A A A
Reader Comments
Display: 0, 50, 100, 200 Sort: Newest First - Order Posted
Viewing: 101 - 151

Page: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43Blog Index

101. tampacanewatcher 8:56 PM GMT en Agosto 27, 2006    
I have just been out around Tampa running errands. I don't see much action...gas stations aren't busy, and the one grocery store I passed was no busier than you would expect on a Sunday afternoon. For the most part, people seem to be going about their normal business.

I hope this means that people are prepared. But I suspect it means that many of my fellow Tampanians have developed a false sense of security after past misses.
102. longislandxpress 8:56 PM GMT en Agosto 27, 2006    
was that a pic of ernesta and ernesto? Whatever it was it threw the board into chaos and depravity
103. sporteguy03 8:56 PM GMT en Agosto 27, 2006    
cyclonebuster,
Very near 90 degrees in those waters...think of it as an IV or caffiene boost to a person its like a jolt in the system
Member Since: Julio 7, 2005 Posts: 0 Comments: 4824
105. mlj1 8:58 PM GMT en Agosto 27, 2006    
I just joined the blog so I could spam the inappropriate posts. I am here for weather knowledge, as I imagine most others are. For those that would also like to spam inappropriate posts, the way to do it is to join the site by creating a logon. Then, below each post, is an option to label it as spam or obscene. Let's keep the blog focused.

Does anyone know what it would take for the models to track Ernesto further west?

Thanks!
106. WhereIsTheStorm 8:59 PM GMT en Agosto 27, 2006    
Posted By: whirlwind at 8:45 PM GMT on August 27, 2006.
Posted By: ricderr at 8:40 PM GMT on August 27, 2006.
cat 2 is enough to give you a blue roof and a gutted house


only if u live in a trailer.....we went thru wilma's EYE... no prob .. just tree damage


whirlwind - I went through WILMA too and I would have been fine if not for the things flying around damaging my roof and carport. My neighbors aluminum roof came off and damaged my roof which allowed additional shingles to come off. It is not always the wind as much as the debris flying around. I just got it all repaired this month.
Member Since: Agosto 14, 2006 Posts: 0 Comments: 403
107. ProgressivePulse 8:59 PM GMT en Agosto 27, 2006    
I will have to say that the new system is working rather well.
Member Since: Agosto 19, 2005 Posts: 5 Comments: 4326
108. hurricane79 9:00 PM GMT en Agosto 27, 2006    
mlj1, easy, ernesto would have to turn WNW more
109. SaymoBEEL 9:00 PM GMT en Agosto 27, 2006    
Link


Check out this loop. Chose the floater in the area of interest. Slow the speed way down and omit all images except 176 and 180. This will cause a toggle between two images and will aid in determining forward direction.
110. caymanguy 9:00 PM GMT en Agosto 27, 2006    
anybody know the windspeed in JA?
111. will40 9:01 PM GMT en Agosto 27, 2006    
agreed PP cuz if it wasnt this blog would be history
Member Since: Septiembre 19, 2005 Posts: 2 Comments: 3439
113. EastCoastWx 9:01 PM GMT en Agosto 27, 2006    
Models are taking this thing more and more east... been seeing alot of people though still holding onto a Mobile/Biloxi landfall

EastCoastWx.net Forums
114. hurricane79 9:02 PM GMT en Agosto 27, 2006    
Does this link look familiar? It is from the GFDL 24 hours ago calling for this exact track....Link
117. hurricane79 9:03 PM GMT en Agosto 27, 2006    
Now, same model run, but 120 hours out: Link
121. longislandxpress 9:04 PM GMT en Agosto 27, 2006    
OK, this is my take. Over land, the spun off circulation is history and a new one slightly to the right is firing OVER LAND. That's a good sign and keeping ernesto alive. But, it's possible a third circulation will "run the gap" and try to hit the tip of cuba. Maximum water, kind of like going over the tiny leg knowing that to go around it would leave Cuba staring at you in the face. If ernesto is to "circularize" and become potent, it will have to spin off this second circulation and form a final one and run the gap with it. I think its a possibility, maybe 50/50
122. kmanislander 9:04 PM GMT en Agosto 27, 2006    
Something else to consider
sometimes friction with land on one side of a system can act as a drag so to speak and tend to pull the system in that direction for a while until it clears the land mass in question.
I wonder if Hispaniola "dragged" Ernesto to the NNW and if so now that he is clearing Haiti will this allow a more WNW track ??
Member Since: Agosto 19, 2006 Posts: 0 Comments: 14939
123. hurricane79 9:04 PM GMT en Agosto 27, 2006    
I cannot stress enough on how accurate the GFDL track has been so far with this system, it saw the turn NNW across the tip of Haiti. It sees a traversing of Cuba from SE to NW, and it sees a Panhandle landfall...as of 2 days ago, 24 hours ago , and as of now...
124. seafarer459 9:04 PM GMT en Agosto 27, 2006    
Hello All,
Iam happy to see the blog back on track.
Member Since: Julio 16, 2006 Posts: 2 Comments: 515
126. NOWORRIES 9:04 PM GMT en Agosto 27, 2006    
It is very difficult to say if this storm is heading more west or more north at this point. Without a better defined eye, or at least a better defined circulation, I can't say that it is doing anything different than the current track.

The key right now is what might happen in these warmer waters. The conditions appear good for intensifiction, but right now Ernesto is not much for strengthening despite these good atmospheric conditions and warm waters. I don't see how this slight brush with Haiti should have such a significamt impact despite these conditions. Maybe this storm will be a fizzler or if not maybe it will take on a drastically different track and strengthen. In comparison, so far this storm has not appeared like many of the storms of the past years to this point.
Member Since: Octubre 24, 2005 Posts: 0 Comments: 116
127. nolesjeff 9:05 PM GMT en Agosto 27, 2006    
Posted By: caymanguy at 8:59 PM GMT on August 27, 2006.
anybody know the windspeed in JA?
TWC just said 18 mph
Member Since: Junio 20, 2006 Posts: 9 Comments: 1391
128. TheNeighbor 9:05 PM GMT en Agosto 27, 2006    
tampacanewatcher

They all seem to leave it till the last minute from what I saw last year ... wait until tomorrow or Tuesday and the mad rush to stock up will start if the track still looks threatening! Why you cant buy tinned goods until 24 hours before the storm beats me!
Member Since: Agosto 25, 2006 Posts: 0 Comments: 39
130. tampabayfish 9:05 PM GMT en Agosto 27, 2006    
I got gas in St. Pete a couple hours ago and every station I passed was busy, with one or two cars filling extra jugs. The water was selling briskly at target, too! I was impressed, this is unlike us...
131. hurricane79 9:05 PM GMT en Agosto 27, 2006    
exactly kamin, please also look at my comparisons for the GFDL in the posts below...It has been DEAD ON for the past 2 days
132. longislandxpress 9:06 PM GMT en Agosto 27, 2006    
Ive seen a lot of canes go around land/islands. That's not what happened here.
135. PBG00 9:07 PM GMT en Agosto 27, 2006    
It has nothing to do with the storm..lets stay on topic please?
Member Since: Octubre 20, 2005 Posts: 14 Comments: 6650
136. plywoodstatenative 9:08 PM GMT en Agosto 27, 2006    
Interesting question, what are they going to do with the Space Shuttle?
Member Since: Noviembre 15, 2005 Posts: 16 Comments: 4147
137. hurricane79 9:08 PM GMT en Agosto 27, 2006    
Go to Link , but change the initial time, scroll down to 12Z on the 26th, then animate, you will see what I mean.
138. tampagirl 9:08 PM GMT en Agosto 27, 2006    
tampabayfish - same thing in Hills county...grocery stores and gas stations crowded. It's only going to get worse.
140. littlefish 9:09 PM GMT en Agosto 27, 2006    
Looks like a whole bunch of us were correct (duh). The storm is a TS and really struggling. We'll see what a break from Hispaniola does, but at present it aint moving very quickly and continues to struggle. I'm surprised Dr M didn't bring up the ULL to the north of Ernesto. I still think there were some PR guys on the flight that called this Hurricane Ernesto. It never looked much like a hurricane today IMO.
142. hurricane79 9:09 PM GMT en Agosto 27, 2006    
any comments of the Aug. 26th GFDL track forecast? Coincidence, or is this the model to have more faith in?
143. MaxQ 9:09 PM GMT en Agosto 27, 2006    
Just like Tampacanewatcher, I have not seen much preparation in Southwest FL. After Charley and Wilma I'm taking no chances.

I am really developing an aversion to blue colored roofs.
Member Since: Abril 7, 2006 Posts: 4 Comments: 0
145. tropicallydepressed 9:11 PM GMT en Agosto 27, 2006    
Dowgraded to a TS. That is wonderful news. For several reasons, one of which being I won't have to see all the Billy-Bob's refer to it as a 'cane anymore...
Member Since: Agosto 11, 2006 Posts: 0 Comments: 126
146. kmanislander 9:11 PM GMT en Agosto 27, 2006    
hurricane
you are right that the gfdl was and still is bang on. If this continues to play out a WNW track would have to materialise for the old end-of-run position to verify
The next few hrs will be interesting to watch
Member Since: Agosto 19, 2006 Posts: 0 Comments: 14939
147. hurricane79 9:11 PM GMT en Agosto 27, 2006    
For those who did not see this loop, please look: Link

Yesterday morning's run with the GFDL. It saw what no other model, or the NHC saw.
148. CybrTeddy 9:11 PM GMT en Agosto 27, 2006    
uh so it is about to make a come back 90* SST
Thus this should come back to a Hurricane
Member Since: Julio 8, 2005 Posts: 253 Comments: 20259
149. hurricane79 9:12 PM GMT en Agosto 27, 2006    
thanks kmanislander, I could see that WNW turn verify as it encounter the weak ridge over Florida. The trough is not here yet.
151. caymanguy 9:12 PM GMT en Agosto 27, 2006    
thanks nolesjeff

Viewing: 101 - 151

Page: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43Blog Index

New Comment
Community Standards Policy Comments will take a few seconds to appear.
Post Your Comments
Please sign in to post comments.
Not only will you be able to leave comments on this blog, but you'll also have the ability to upload and share your photos in our Wunder Photos section.
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.

Local Weather
Overcast
45 ° F
Nublado
Community Activity