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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201. NOWORRIES 9:30 PM GMT en Agosto 27, 2006    
If the GFDL proves right for the next 3 days - which is all you can expect, then I believe the trough to the north will curve the system more to the east once in the gulf. This is not a good scenario for Florida.
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202. scla08 9:30 PM GMT en Agosto 27, 2006    
I agree with you energytrader & whirlwind..
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203. longislandxpress 9:31 PM GMT en Agosto 27, 2006    
Ernesto seems to be dragging it feet over Haiti in an effort to form a single, coherent circulation. I've seen one spin off into oblivion already. The small "new" one, could spin off as well. If it does, the storm will finally be organized and rather large. I'm not saying this will happen, but Phase I of this scenerio is already completed. This would cause a slight nudge to the east again as far as the track.
204. JupiterFL 9:31 PM GMT en Agosto 27, 2006    
Anton I am not looking for advice but you seem to give it. I always listen to the NHC and they are not saying what you are thats for sure.
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205. eye 9:31 PM GMT en Agosto 27, 2006    
yeah, some flooding, a few tornadoes, not a big deal...it looks more and more like Ernie will not even survive Cuba...2 days on Cuba will kill it, and it is only a TS. Dennis went from Cat 3 to barily Cat 1 after 2 days over Cuba!
Member Since: Agosto 21, 2006 Posts: 0 Comments: 147
207. Thaale 9:31 PM GMT en Agosto 27, 2006    
eye, Katrina was only a cat 1 (in Miami), and it knocked out a lot of power and downed a lot of trees.

A cat 1 might not be a threat to tear off tens of thousands of roofs, but it can still bring a city to a standstill.
Member Since: Octubre 19, 2005 Posts: 0 Comments: 308
208. bmclee 9:32 PM GMT en Agosto 27, 2006    
Frankly, if Ernesto comes up the Western shoreline, or up the middle of Florida it will be just fine with me. This area has been thoughly vetted by recent hurricanes of stronger winds. The rain will do a lot of good, particularly in Northern Florida.

Mike
209. kmanislander 9:32 PM GMT en Agosto 27, 2006    
18.3N74.2W
Center now resuming a course over water
I will check back in a couple of hrs to see if Ernesto ignores the forcast again and returns to a WNW course
Link
Member Since: Agosto 19, 2006 Posts: 0 Comments: 14939
210. plywoodstatenative 9:33 PM GMT en Agosto 27, 2006    
http://www.nrlmry.navy.mil/tcdat/tc06/ATL/05L.ERNESTO/vis/modis/qkm/20060827.1856.aqua.x.visqkm.05LERNESTO.50kts-1002mb-178N-740W.70pc.jpg

have a look at this photo, copy/paste the link.
Member Since: Noviembre 15, 2005 Posts: 16 Comments: 4147
211. vortextrance 9:33 PM GMT en Agosto 27, 2006    
Posted By: nash28 at 9:20 PM GMT on August 27, 2006.
My feel is that there are alot of people on here now who live for the second to second fluctuations in strength and then think they have it all figured out.


Totally agree. Ernesto strengthens and we got a cat 5 on the way. Now today many are saying Ernesto is dead. To me I really haven't had a feel since the center reformed yesterday. Since then I expected more of a western track which has not happened. The NHC's guidance has been poor, to this point, so that really hasn't helped. Many things can still happen. I expect some more changes in the track by tomorrow.
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212. gnshpdude 9:33 PM GMT en Agosto 27, 2006    
Latest Votex data has the center at 17.7 N 74.1 W. Strange.
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213. hurricaneman23 9:33 PM GMT en Agosto 27, 2006    
how do u think this will affect southeast fl? strong tropical force winds?
215. Anton7 9:33 PM GMT en Agosto 27, 2006    
Posted By: quakeman55 at 9:22 PM GMT on August 27, 2006.

Thanks Quakeman, and tampabay, interesting, the next few hours should tell us more, still, if Ernesto gets much futher north, I still predict it will not have enough open water to develop into anything very serious.
216. magicfan1423 9:33 PM GMT en Agosto 27, 2006    
Nash: Eye is right, a Cat 1 hurricane is like a severe afternoon thunderstorm. I've lived in Florida all my life, i've been through numerous Hurricanes. In a Cat 1, we will have minimal power outages, some mobile homes may get damaged severely, houses may lose shingles, minor flooding, just a longer, slightly more intense thunderstorm. It will spawn tornadoes however, there really isn't that much of a difference. I've seen some pretty nasty thunderstorms, including earlier this week i had a nasty thunderstorm that was raining 4 inches an hour, phew. Lightning every 3 seconds or so. It lasted for about 20 minutes. I realize that the hurricane would close down businesses and schools for a day, and it would last hours, not minutes. Other than that, a Cat 1 isn't much. When you start getting near a Cat 2, however, then you have houses becoming damaged, some collapse, it's a much nastier story.
217. sporteguy03 9:34 PM GMT en Agosto 27, 2006    
I want to apologize for an incorrect prediction...I said FL I hope it is incorrect. I don't want any storms here.
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218. NOWORRIES 9:34 PM GMT en Agosto 27, 2006    
Thaale - Exactly - any storm these days will shut down airports and cause frantic behavior, possibly rightly so after the past few years
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219. gnshpdude 9:34 PM GMT en Agosto 27, 2006    
Here is the decoded Vortex.

Storm ERNESTO: Observed by AF #302
Storm #05 In Atlantic Ocean
Total Flights For Storm #05: 06
Date/Time of Recon Report: August 27, 2006 20:19:20 Zulu
Position Of The Center: 17 40 ' N 074 06 ' W (17.67 N 74.10 W)
Minimum Height Measured At Standard Level Of 850 Millibars: 1465 Meters (Normal: 1457 Meters)
Maximum Surface Winds Were Estimated At: 20 Knots (23 MPH)
Estimated Surface Winds Were Measured At: 018 Nautical Miles (20.7 miles) From Center At Bearing 131
Maximum Flight Level Winds Near Center Were 033 Knots (37.95 MPH) From 195
Maximum Flight Level Winds Were Measured 062 Nautical Miles (71.3 Miles) From Center At Bearing 131
Minimum Pressure: extrap 1004 Millibars (29.647 Inches)
Maxium Flight Level Temperature / Pressure Altitude Outside The Eye: 17C (62.6F) / 1523 Meters
Maximum Flight Level Temperature / Pressure Altitude Inside The Eye: 23C (73.4F) / 1523 Meters
Dewpoint Temperature / Sea Surface Temperature Inside The Eye: 13C (55.4F) / NAC (NAF)
Eye Wall Was Characterized As Being: NA
Eye Form Was Characterized As Being: NA
Center Fix Established Using: Penetration Wind Pressure Temperature
Center Fix Established At Level(s): 850 Millibars
Navigational Accuracy Measured At: 0.02 Nautical Miles
Meteorological Accuracy Measured At: 3 Nautical Miles

Other Information:
1: Maximum Flight Level Winds Were 33 KT E Quadrant at 20:00:40 Z
2: SLP EXTRAP FROM 850 MB


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220. hurricaneman23 9:35 PM GMT en Agosto 27, 2006    
gnshpdude is that location more to the right of the track?
221. sflhurricane 9:35 PM GMT en Agosto 27, 2006    
i went thru the EYE of katrina in south fl and man, there was speculation that katrina mitve made landfall as a cat 2 bc those winds that i saw outside my house were unbelievable so if thats wat a cat 1 looks like, all hurricanes whether cat 1 or 5 are nothing to be taken lightly
Member Since: Agosto 25, 2006 Posts: 0 Comments: 355
223. whirlwind 9:36 PM GMT en Agosto 27, 2006    
ok weak hurricane who cares??


BUT tornadoes, no fun, not a game. 100% chance that you loose it all.


anyhow, just wait for the 11pm.update
224. EastCoastWx 9:36 PM GMT en Agosto 27, 2006    
Wow, Jeb Bush has already issued a state of emergency... a little early don't you think ?

EastCoastWx.net Forums
225. seminolesfan 9:37 PM GMT en Agosto 27, 2006    
icecreamgirl-u have mail
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226. eye 9:37 PM GMT en Agosto 27, 2006    
new prediction, 40mph at 11pm
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227. gnshpdude 9:37 PM GMT en Agosto 27, 2006    
Actually more to the SE. I'm not sure if the COC re-formed or what. I'll have wait and see.
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228. Cavin Rawlins 9:38 PM GMT en Agosto 27, 2006    
Look at Ernesto..Imagine when it moves back over water.

Member Since: Julio 24, 2005 Posts: 407 Comments: 19076
229. CURIOUSWEATHERGRL 9:38 PM GMT en Agosto 27, 2006    
okay yesterday's forcast didn't anticipate the
West Coast of FL to be an issue...why such a
drastic change in forcast in 24hrs? Is there
something else with a "high" or a "trough" or
a "something else" that could change this
forcast again taking it more West??
Member Since: Agosto 1, 2006 Posts: 0 Comments: 32
230. JupiterFL 9:38 PM GMT en Agosto 27, 2006    
I guess he just wants to be prepared for the worst case.
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231. magicfan1423 9:38 PM GMT en Agosto 27, 2006    
Whirlwind- Tornadoes spawned from minor hurricanes, even major hurricanes are never strong. They, most the time, don't even register on the F scale. So it wouldn't do much.
232. Tazmanian 9:38 PM GMT en Agosto 27, 2006    
it seen like to me that this is now moveing off and start to come back overe water and is it me or dos it seen like it this dos not want to go with the nhc track well what i mean by that is it look like i might not be right about it but it looking right it movien to near Jamaica then what the nhc as it moveing dos any one see this?
Member Since: Mayo 21, 2006 Posts: 5088 Comments: 111346
233. tampagirl 9:39 PM GMT en Agosto 27, 2006    
EastCoastWx - I'd say good old Jebby isn't taking any chances. Probably not too early to get everything in place if his state gets hit.
234. Cavin Rawlins 9:39 PM GMT en Agosto 27, 2006    
Ernesto is huge....
Member Since: Julio 24, 2005 Posts: 407 Comments: 19076
235. whirlwind 9:39 PM GMT en Agosto 27, 2006    
Weather456- ive beeen looking at floaters all day.

on that view ernesto LOOKS HUGE!!! HUGE!!!

if it wraps all that around him...OH MY @#$@#
236. magicfan1423 9:40 PM GMT en Agosto 27, 2006    
Tazmanian- Ever heard of Spell Check?
237. 76Hokie 9:40 PM GMT en Agosto 27, 2006    
Here in North Pinellas County (Palm Harbor, Clearwater, Tarpon Springs), saw several shoppers coming out of a Publix with cartloads of water jugs late this afternoon. The entire water aisle at a nearby Target was empty. Most gas stations had a few cars, but no long lines.
239. Cavin Rawlins 9:41 PM GMT en Agosto 27, 2006    
That is scary..
Member Since: Julio 24, 2005 Posts: 407 Comments: 19076
240. gnshpdude 9:41 PM GMT en Agosto 27, 2006    
hurricane79,

I agree with you that the GFDL model seems the best for the past few years. Since I live the FL panhandle, I will wait until tommorrows forcast to decide to board up or not.
Member Since: Agosto 26, 2005 Posts: 0 Comments: 118
241. sflhurricane 9:41 PM GMT en Agosto 27, 2006    
the center looks to be on the SW tip of haiti, riding along Haiti's southern "leg"
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242. stormhank 9:41 PM GMT en Agosto 27, 2006    
Is the Fla. big bend off the hook of ernesto tracking this far north?
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244. plywoodstatenative 9:41 PM GMT en Agosto 27, 2006    
magic, were you in wilma? Tornadoes did a lot of the damage, I watched a pretty good sized one form over top of the school I was staying in and head over to where I was living at the time. Trust me it wasn't pretty afterwards.
Member Since: Noviembre 15, 2005 Posts: 16 Comments: 4147
245. tropicallydepressed 9:42 PM GMT en Agosto 27, 2006    
it seen like to me that this is now moveing off and start to come back overe water and is it me or dos it seen like it this dos not want to go with the nhc track well what i mean by that is it look like i might not be right about it but it looking right it movien to near Jamaica then what the nhc as it moveing dos any one see this?

Anyone?
Member Since: Agosto 11, 2006 Posts: 0 Comments: 126
246. hurricane79 9:42 PM GMT en Agosto 27, 2006    
BRB, taking a 20 min break
247. hurricaneman23 9:42 PM GMT en Agosto 27, 2006    
looks to be starting to reorganize to me, u guys agree?
248. longislandxpress 9:42 PM GMT en Agosto 27, 2006    
I think Ernesto is becoming MUCH better organized, the strength could come later and much faster with greater potential in a complete system.( no split/twin)
249. HoustonTex 9:42 PM GMT en Agosto 27, 2006    
Good evening,
Just checked the latest visual and unless I've really lost it, there appears to be an exposed surface COC at 18.3N, 75.7W. Do we have a new (old?) COC forming? The banding just south of Guantanamo also seems to suggest a new center.
250. Tazmanian 9:42 PM GMT en Agosto 27, 2006    
Posted By: magicfan1423 at 2:40 PM PDT on August 27, 2006.
Tazmanian- Ever heard of Spell Check?


LOL sorry about that i try harder
Member Since: Mayo 21, 2006 Posts: 5088 Comments: 111346

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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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