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
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 | 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 | 51 | 52 | 53 | 54 | 55 | 56 | 57 | 58 | 59 | 60 | 61 | 62 | 63 | 64 | 65 | 66 | 67 | 68 | 69 | 70 | 71 | 72 | 73 | 74 | 75 | 76 | 77 | 78 | 79 | 80 | 81 | 82 | 83 | 84 — Blog Index
Do you think he will continue west? remember Earl almost cut us in Half and suppose to be a fish storm.
great so we are due....
Concur on point 1. It's just a curve ;)
As for point two, 1012 is not nearly enough to contain a monster like Igor.
Igor's stadium effect eye, amazing. Look at that outflow.
In terms of the tropics, the Atlantic basin includes the GOM and the Carib...one must set the parameters or one receives too wide a response...
LOL
In the Atlantic (probably anywhere in the northern hemisphere but I will stick with home waters) a tropical system moves first east to west, then will curve to the north, and then recurve to the east. You might see the term recurving using to describe the entire processing of going first north then east.
I was speaking in terms of the Open Atlantic. I am aware of all the others. I was pointing out the rarity of Cat 5's in the Open Atlantic.
I too like to read others skilled interpretations of the data and I certainly know that the NHC can and has been wrong in the past, but do you really think they gear their forcasts toward political interests? I'm curious what you meant by that because it just sounds soo, conspiracy theory. Not trying to be incendiary either, just genuinely wondering what you meant.
No, I don't mean they gear their forecasts towards political interests. However,I think the NHC is conservative quite often. I also do think there is a political element to it, but certainly not to the extent of a conspiracy to defraud the public from reliable information. They have the public's best interest in mind, and often panic control is an element of that best interest. However, I feel they do an excellent job..I just want to see other's opinions as well.
Maybe not the 2nd trough... but the 3rd over the prairies.
you forgot Cleo in 1958 and Dog in 1950
It must be a School House Rock grammar thing.
A child of the 70's am I!
I see what you are saying now, got it.
1-Storm W predict a pattern change.
2-Igor was suppose to begin going north.
3-Storm W predict not now, is going to recurve, but more far west.
4- Today, Igor fail NHC forecast point going south of it.
5-Storm W forecast was right, Igor don't begin to recurve where NHC says.
6-People blabling against Storm W needs to get over it and shut up.
:)
+1
And that will, simply due to time, have a major difference on who, if anyone, gets a hit.
Ahhh...you gave a proposition with relatively ill-defined parameters
Should turn around 53-55W instead of umm.. now as the NHC and models are forecasting. Gotta go to work, I personally feel Igor is a Category 5 storm, after the 5 p.m. advisory, the hurricane really got going with more banding and a ring of convection. I'm expecting models to shift slightly to the left tonight, we'll see.
or the 4 th one thru the ocean white with foam
Well the question is what effect will pumping have..if it's enough to stop the turn north thats significant both from a met how a hurricane is steered to oh no it's coming right at me..
If I get time I'd like to read up on those papers the Doc mentioned to Storm.
Of course you can debate Storm. Just like you can debate Masters' opinion, or the NHC's, Reed's or Levi's. They are opinions. I was merely commenting on what I saw as baiting, not discourse. I thought good honest debate was the point of this blog.
Earl is the strongest storm of the current season (as of today 2100UTC): 928 mbar (hPa) (27.42 inHg), 145 mph (230 km/h)
thats eye temp not latitude.
You could get a game of football going in there! (Stadium clouds, har har)
+1000
Thanks for clarifying. You are probably right there must be a certain amount of pressure not to create a ruckus (aka, state of mass panic) to a coastal area before they are sure that's where it's headed.
oops - meant 1960... because that supports the 1 per decade idea + more sophisticated monitoring of storms was available.
Viewing: 1751 - 1801
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 | 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 | 51 | 52 | 53 | 54 | 55 | 56 | 57 | 58 | 59 | 60 | 61 | 62 | 63 | 64 | 65 | 66 | 67 | 68 | 69 | 70 | 71 | 72 | 73 | 74 | 75 | 76 | 77 | 78 | 79 | 80 | 81 | 82 | 83 | 84 — Blog Index