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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92L doesn't have a lot of time. It's barrelling toward the Yucatan.
that was amazing. also amazing was that we went into the greek alphabet that year.
still heading wwwsw....strong enough and south enough to "miss" the models. shoot...they ain't got a clue.....I can draw a banana shape arcing up and get as close as the models are.
how do they deal with a hurricane, that by my estimation....will hit close to 170-180 mph winds?
igor will be the master of disaster...
the titan of '10
tempestuous tropical whirlwind...
models schmodels....
what say the experts? is this thing gonna keep heading west?????
That is same long that Earl turned if remember correctly.
i like your wordplay. somewhat poetic. lol
Definitely impressive.
$1bn doesn't hold the same clout as it once did in terms of damages.
Although, it depends where those 1bn come from. If it's America, then not so much, needs a bit more than that (due to inflation, higher living standards etc etc) to warrant retirement (unless there are saddening amounts of fatalities).
On the other hand, if it's $1bn in, say, the Lesser Antilles, then it's a total disaster.
Link
conversion chart brla
WITH A BROAD AREA OF LOW PRESSURE OVER THE WEST-CENTRAL CARIBBEAN
SEA. SOME DEVELOPMENT OF THIS SYSTEM IS POSSIBLE AT IT MOVES
WEST-NORTHWESTWARD AROUND 20 MPH...AND THERE IS A MEDIUM CHANCE...
40 PERCENT...OF THIS SYSTEM BECOMING A TROPICAL CYCLONE DURING THE
NEXT 48 HOURS. REGARDLESS OF DEVELOPMENT...LOCALLY HEAVY RAINFALL
IS POSSIBLE OVER PORTIONS OF HISPANIOLA...JAMAICA...CUBA...THE
CAYMAN ISLANDS...AND THE YUCATAN PENINSULA DURING THE NEXT DAY OR
TWO. THESE RAINS COULD CAUSE LIFE-THREATENING FLASH FLOODS AND MUD
SLIDES...ESPECIALLY IN AREAS OF MOUNTAINOUS TERRAIN.
High is bridgin at 28n 74w
Odds aren't good even for that, although it's possible. Not particularly spectacular.
92L just waited too long, with its tendancy to collapse every evening.
It is listed as 41958
2:00 PM AST Mon Sep 13
Location: 15.1°N 26.7°W
Max sustained: 45 mph
Moving: WNW at 13 mph
Min pressure: 1002 mb
agreed
Visual-spatial thinkers are naturals at understanding vector calculus (though it can be hard to get basic algebra down, lol). As a result, it's not surprising that many with a meteorological interest would think this way! I bet most of the pros do, too.
Nothing else on TWO.
Any way to discard the Lat/Lon lines?
Aside that, simply breathtaking.
No
Child #2 is now firmly entrenched in the Yo-Gabba-Gabba, Upside Down Show, etc., stuff. Oh well, I survived the first time.
It appears that Igor is on the verge of bypassing that second trough that has been forecasted to turn it WNW and then out to sea...
Nope. Don't think so. Lots of reasons why. Let's take a look at some....
1. Right now, IGOR is going through an EWRC (Eye Wall Replacement Cycle). The eye is shrinking and winds are down across the board on sattelite estimates:
SATCON = 116 kts / 945 hPa
CIMSS = 104 kts / 953 hPa
ADT = 127 kts / 937 hPa
IGOR should complete the eyewall cycle tonight. This should make IGOR bigger. Bigger storms usually have slower max wind potential, but not always.
2. Take a look at this picture. This is the current sea surface temperature (SST) crossed with archival data suggesting a hurricane can only reach so high in maximum winds based on the temperature. Notice that IGOR is in the 140kts max area.
Also note the projected path of IGOR. Its forecast to stay over the "140 max" slot. However, if IGOR continues to move WEST of the forecast track as it has continued to do, there is a swath of 160 kt max wind temeratures in front of it. If it enters that area, then all bets are off!!
ADVANCED DVORAK TECHNIQUE
ADT-Version 8.1.1
Tropical Cyclone Intensity Algorithm
----- Current Analysis -----
Date : 13 SEP 2010 Time : 164500 UTC
Lat : 17:33:55 N Lon : 49:53:35 W
CI# /Pressure/ Vmax
6.4 / 939.6mb/124.6kt
Final T# Adj T# Raw T#
6.4 6.5 6.5
Latitude bias adjustment to MSLP : +2.0mb
Estimated radius of max. wind based on IR : 27 km
Center Temp : +18.8C Cloud Region Temp : -68.2C
Scene Type : EYE
Positioning Method : RING/SPIRAL COMBINATION
Ocean Basin : ATLANTIC
Dvorak CI > MSLP Conversion Used : ATLANTIC
Tno/CI Rules : Constraint Limits : NO LIMIT
Weakening Flag : ON
Rapid Dissipation Flag : OFF
i get a real nerdy kick out of architecture too.
Water temp is 28.7.
Link
That's one heck of inny belly button!!!
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