Igor an impressive Cat 4; 92L running out of time to develop; Julia forms
There are few sights in the natural world more impressive than a hurricane near maximum intensity. Hurricane Igor certainly fits that description this morning, as it flirts with Category 5 strength in the Central Atlantic. Igor's rapid intensification burst brought the mighty hurricane's winds to 150 mph, just shy of the 156 mph threshold for Category 5 status. Igor is the strongest hurricane in the Atlantic in three years. The last hurricane stronger that Igor was Category 5 Hurricane Felix of 2007.
Figure 1. Morning satellite image of Igor.
Intensity forecast for Igor
Wind shear is low, 5 - 10 knots, and is expected to remain low for the next four days. Waters are warm, 28.5°C, and will warm to 29°C by Wednesday. Igor has moistened its environment enough to keep the dry air of the Saharan Air Layer (SAL) at bay. These conditions should allow Igor to remain at major hurricane status for the next four days. The hurricane will probably undergo one of the usual eyewall replacement cycles intense hurricanes commonly have, where the eyewall collapses and a new eyewall forms from an outer spiral band. This will weaken the hurricane by 10 - 20 mph when it occurs, but Igor will probably regain its lost intensity when the cycle completes. There's no evidence that an eyewall replacement cycle is imminent today, so Igor could potentially strengthen a bit more. However, I believe Igor has peaked, and will not reach Category 5 status today. By Saturday, when Igor should be nearing Bermuda, the trough of low pressure steering Igor northwestwards should bring moderate wind shear of 10 - 20 knots to the storm, weakening it.
Track forecast for Igor
The track forecast for Igor remains unchanged. Igor will move west under the influence of a strong ridge of high pressure until Tuesday morning, then turn more to the west-northwest then northwest in response to the steering influence of a broad trough of low pressure moving across the Western Atlantic on Tuesday and Wednesday. This should allow Igor to pass several hundred miles to the northeast of the Lesser Antilles. In the longer range, Igor appears likely to be a threat to Bermuda, and that island can expect tropical storm force winds as early as Friday. Igor does have a small chance of making landfall on the U.S. East Coast or Canada. Climatology shows that about 15% of all tropical cyclones that have existed at Igor's current position have gone on to hit the U.S. East Coast; these odds are about 10% for Bermuda and 10% for Canada. The forecast steering pattern for the period 5 - 10 days from now from the ECMWF and GFS models shows a continuation of the pattern we've seen all hurricane season, with regular strong troughs of low pressure moving off the U.S. East Coast. This pattern favors Igor eventually recurving out to sea without hitting the U.S. or Canada. While the trough expected to recurve Igor out to sea is not as sharp as the troughs that recurved Danielle, Earl, and Fiona, it should still be strong enough to keep Igor from hitting the U.S. However, Newfoundland, Canada could see a close pass. An examination of the tracks of the ten major September hurricanes that have passed closest to Igor's current location (Figure 2) reveals that one of these hurricanes went on to hit the Bahamas and Florida as a Category 2 storm, and another hit Newfoundland as a Category 1 storm. The other eight missed land. One wild card may be the intensification of Julia behind Igor. If Julia develops into a hurricane and moves close to Igor, as some of the models are suggesting, the two hurricanes could interact, affecting the track of Igor unpredictable ways. However, it currently appears the Julia will be much weaker than Igor, and will probably have little impact on her big brother's track.
Figure 2. Historical plot of the tracks of the ten major September hurricanes that have passed closest to Igor's current location.
Caribbean disturbance 92L
Tropical disturbance (92L) over the Central Caribbean, centered about 100 miles south of Jamaica, has changed little over the past day. The storm remains a threat to develop into a tropical depression, but time is running out for it to do so. Satellite loops this morning do not show a surface circulation, but 92L does have a moderate area of intense disorganized thunderstorms that are bringing heavy rain to Jamaica this morning. Kingston, Jamaica has picked up 0.67" of rain thus far this morning from 92L.
Figure 3. Morning satellite image of 92L.
Forecast for 92L
Wind shear over 92L is low, 5 - 10 knots, and is expected to remain low to moderate for the next five days. The waters beneath are hot, 29.8°C, and these warm waters extend to great depth. Water vapor satellite loops show a large area of dry air lies to the north and west of 92L, and this dry air has been interfering with development of 92L. NHC is putting the odds of 92L developing into a tropical depression by Wednesday at 40%. Given the current disorganized state of 92L, it would be difficult for it to intensify quickly enough to become any stronger than a tropical storm with 50 mph winds by Wednesday, when it will move over Belize and Mexico's Yucatan Peninsula. Once 92L crosses the Yucatan, the ridge of high pressure steering it is expected to remain in place, forcing 92L to a second landfall in Mexico several hundred miles south of the Texas border. A Hurricane Hunter aircraft is scheduled to investigate 92L this afternoon.
Julia
Tropical Storm Julia formed between the Cape Verdes Islands and coast of Africa yesterday, bringing some heavy rain squalls and gusty winds to the Cape Verdes, but no sustained winds of tropical storm force. Julia is headed northwest, out to sea, and it is unlikely that this storm will trouble any land areas . Shear is low enough over the next few days to allow Julia to become a hurricane, but shear will rise sharply 4 - 5 days from now, limiting the potential for Julia to become a major hurricane.
Elsewhere in the tropics
The NOGAPS model is calling for a new tropical depression to form off the coast of Africa 6 - 7 days from now.
Next post
I'll have a new post Tuesday morning.
Jeff Masters
Reader Comments
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I get it Drak, and like I said, I am not completely discounting any possibilities with Igor right now. Just saying that it would take a huge model failure to get Igor over to the OBX, and one as big as the Katrina models to get it anywhere S of that.
no problem with Westcasting or Wishcasting or whatever you call it. Almost ALL of the models (with the exception of the UKMET) say this Hurricane should have been heading North of West 12 hours ago and they all insist it should be heading N of West right now...but it isn't. The UKMET is handling it very well at the moment.
However, with that all said, even the UKMET says it will go NW eventually. US looks safe for now still. Bermuda? Not so much.
In any event, nothing wrong with posting your opinions and sharing any data or maps you think support your opinion.
already can throw out all the models except ukmet...
Models then show a strengthening NAO ridge and pattern after the 21st, with GFS ensembles and EURO as well as GFS op showing this ridge bouncing back and could have a pronounced effect on turning Julia to the west-northwest, however Julia will already have been too strong and too far north not to feel the westerly winds over the North Atlantic Ocean which will absorb her into a trough and take her eastward towards Europe. The strong SE Ridge/Bermuda high will be responsible for steering invest 92L and I see no reason why it will weaken and allow 92L to move northward. Therefore 92L seems destined for a Yucatan peninsula landfall somewhere in Belize or just south of Cozumel, MX as a possible strong TS or low end category one hurricane given the favorable atmospheric conditions as well as extremely favorable oceanic conditions on its forecast track. This systems seems destined for the BOC and then landfall on the mainland of MX.
It's at .00001%.
For anyone who wants a break for 10 minutes for some reality from a forecaster who has not been wrong all season...just click on Weatherguy03 and watch his video blog. C'mon...it's just 10 minutes.....then you can come back here for the pump, pump, pump.
Sarcasm flag was ON
Isabel was referenced...And that was seven years ago.
I love your avatar...it reminds me of taco bell or old el paso frozen dinners.
I appreciate that
An hour ago, you were telling us a Cat 5 upgrade seemed imminent.
We know this isn't written in stone. But if you're going to offer interpretations that differ sharply from the modeling and forecasts, it helps to offer more than the possibility of some other track. A forecast requires plausibility, which is not at all the same.
I was with you with Earl and I'm agreeing with you again on Igor. Great job this year StormW, have a good lunch.
(Large version...click)
For Bermuda (and plus/minus 1 deg lat/long), well, variability and a small target conspire to make the probability rather low. Less than 10%.
(Large version...click)
You're asking the wrong person. I'm a novice at all this. I'd tell you to argue the point with StormW, but I see he's already picked up on your post. I'll look at the link. Thanks. :)
Even I highly recommend this. Bob has done a great job with his video's. And for you history buffs, you know that me saying that means it must be pretty damn good analysis.
In any event, this is a blog to offer your opinions on what you think might happen. If you differ with StormW or anyone else, feel free to share your opinions AND post some data and/or maps to prove your point so we can digest it. Otherwise, just sit back and read. That's okay too you know...
Maybe. Atmo would know more about that than me though
While I agree, Ike didn't say anything about the westcasters being crazy and all. He just pointed out what he is seeing, and he is right, Igor will be turning northward soon, it's all in the water vapor.
Again people the NHC confidence is LOW on the track of Igor, get a grip people.
Perhaps you need to read Storm's synopsis. You are on ignore.
I clicked the link to make it bigger I think its funny it has 70 to 90 percent for Midatlantic and nearly 100 percent over the Great Lakes.
Guess someones coffee was a little weak making that chart up LOL
I may be wrong, but i think that the NHC considers a track to be what it is after 6 hours.
how can you predict a close call for PR when you look at the NHC guidance (which is west of the model consensus)?
Yes I read it.
I'll say this about this blog.... those that are in one corner on a system are almost always in the same corner on any future systems.
Seems like 92L has become the forgotten one. I've heard and read forecasts on it for it to be a TD...TS or even a hurricane by now. Busted forecast. No one's forecast are always right. Not the NHC or any one else on here.
Not completely disagreeing with the phenomenon, just something that wasn't covered I guess in my tropics classes. Just never heard the NHC mentioning "pumping of the ridge" is the reason why a storm doesn't turn as quickly. I've been searching, but still can't find any proof this exists.
Drak, simply amazing to watch. At least Igor has great outflow and two outflow channels present, while Gustav had one outflow channel at his peak intensity as he hit western Cuba.
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