Karl near hurricane strength; Igor intensifying again
Tropical Storm Karl is back over water after popping off the coast of Mexico's Yucatan Peninsula early this morning. Despite being a small storm, Karl managed to keep a remarkable degree of organization during its crossing of the Yucatan. Karl has already regained all of its lost strength, and is near hurricane intensity. A Hurricane Hunter aircraft is currently in Karl, and at 8:47am EDT found winds at 5,000 feet of 85 mph, which suggest winds near 65 - 70 mph were occurring at the surface. The aircraft noted that Karl had built an eyewall that was open on the north-northeast side. The eye is now apparent in both visible and infrared satellite imagery. Mexican radar out of Alvarado shows the outer spirals bands of Karl are approaching the coast near Veracruz, and heavy rains of 2 - 4 inches can be expected today along much of Mexico's Bay of Campeche coast.
Figure 1. Image from NASA's Terra satellite taken at 12:40pm EDT Wednesday September 15, 2010 of Tropical Storm Karl over the Yucatan Peninsula. Image credit: NASA.
Forecast for Karl
Conditions for intensification are ideal in the Gulf of Mexico's Bay of Campeche, with wind shear expected to be low, 5 - 10 knots, SSTs warm, 29°C - 30°C, and the atmosphere very moist. These conditions, combined with the topography of the surrounding coast which tends to enhance counter-clockwise flow, should allow Karl to intensify into a Category 2 hurricane before making landfall between Tampico and Vercruz, Mexico Friday morning. NHC is giving Karl a 7% chance of reaching Category 3 strength, but the recent data from the Hurricane Hunters suggest that these odds are higher, perhaps 30%. The 06Z (2 am EDT) run of the GFDL model makes Karl a strong Category 2 hurricane with 105 - 110 mph winds at landfall Friday, and this is a reasonable forecast. Karl is a small storm, and is unlikely to bring any rain or wind to Texas.
Figure 2. Forecast swath of maximum winds from Karl, as predicted by the GFDL model on its 2am EDT (6Z) run this morning. The GFDL is predicting a 50-mile wide stretch of the Mexican coast will receive Category 1 (yellow colors, 64+ knots) or Category 2 (orange colors, 83+ knots) winds. Image credit: Morris Bender, NOAA/GFDL.
Igor
Hurricane Igor completed an eyewall replacement cycle early this morning, and has been intensifying. Igor is headed west-northwest to northwest at 7 mph, and this motion will carry the core of the hurricane close to NOAA buoy 41044 between 9 - 11 pm EDT tonight. Top winds at the buoy so far today have been 52 mph, gusting to 65, with a significant wave height of 32 feet (the significant wave height is the average height of the highest 1/3 of the waves.) The Hurricane Hunters are scheduled to make their first flight into Igor this afternoon, and we will see then exactly how strong Igor is. Satellite imagery shows that Igor looks a bit ragged on its north side, but the northern eyewall is getting stronger, and the eye is clearing out and contracting--signs of strengthening.
Figure 3. Morning satellite image of Igor.
Intensity forecast for Igor
Wind shear is low to moderate, 5 - 15 knots, and is expected to remain in this range through Saturday morning. Waters are warm, 29°C, and will remain 29°C through Saturday morning. Igor is well armored against any intrusions of dry air for at least the next two days. These conditions should allow Igor to remain at major hurricane status through Saturday afternoon. It is possible the hurricane will undergo another eyewall replacement cycle on Friday or Saturday, where the eyewall collapses and a new eyewall forms from an outer spiral band. This will weaken the hurricane by 10 - 20 mph if it occurs, but Igor may regain its lost intensity once the cycle is over, as it has done after the two eyewall replacement cycles it has already undergone. By Saturday morning, 36 hours before the core of Igor is expected to pass Bermuda's latitude, the trough of low pressure steering Igor northwestwards should bring moderate wind shear of 10 - 20 knots to the storm, potentially weakening Igor. The SHIPS models predicts shear will not rise to the high range, 20 - 30 knots, until after the hurricane reaches the island. Igor will also be tracking over cooler 28°C waters during this period, and substantial weakening by perhaps 20 - 30 mph can be expected about the time Igor arrives at Bermuda. Igor will still probably be at least a Category 2 hurricane on its closest pass by Bermuda on Sunday night, and perhaps a Category 3 storm. NHC is giving Bermuda a 21% chance of experiencing hurricane force winds from Igor, but this probability is likely too low. The Bermuda Weather Service is calling for Category 1 or 2 hurricane conditions for the island on Sunday, with 20 - 30 foot waves in the offshore waters.
Igor's impact on Bermuda
The track forecast for Igor remains unchanged. Igor is moving west-northwest, in response to the steering influence of a broad trough of low pressure moving across the Western Atlantic. This trough will steer Igor to the northwest and north over the next three days, bringing the core of the storm very close to Bermuda late Sunday night. Igor is a huge storm, and tropical storm force winds extend out 270 miles to the north of its center. As the hurricane moves north, it will expand in size, as it takes advantage of the extra spin available at higher latitudes due to Earth's rotation. By Saturday night, Igor's tropical storm force winds are expected to extend outwards 310 miles from the center. Igor will be moving at about 11 - 13 mph during the final 24 hours of its approach to Bermuda, so that island can expect a period of 39+ mph tropical storm force winds to begin near midnight Saturday night--a full 24 hours before the core of Igor arrives. Igor will speed up to about 15 mph as it passes Bermuda near midnight Sunday night. Hurricane force winds will probably extend out about 60 miles from the center then, and the island can expect to be pounded by hurricane force winds for up to 6 - 8 hours if the core of the hurricane tracks over the island. In all, Bermuda is likely to suffer a remarkably long 36-hour period of tropical storm force winds, with the potential for many hours of hurricane force winds. Long-duration poundings like this are very stressful for buildings, and there is the potential for significant damage on Bermuda.
Igor's impact on the rest of the Atlantic
The models have been in substantial agreement over multiple runs that Igor will miss the U.S. and Canadian coasts--with the possible exception of southeast Newfoundland, which the ECMWF model predicts could see a close pass by Igor. The chief danger to the U.S. and Canada will come in the form of high waves. Large swells from Igor have arrived in the Northern Lesser Antilles Islands and Puerto Rico, and will spread westwards over the next few days. By Saturday, much of the East Coast from northern Florida to Cape Cod Massachusetts can expect waves of 3 - 4 meters (10 - 13 feet), causing dangerous rip currents and significant beach erosion. These waves will continue through Sunday then gradually die down. The latest NOAA marine forecast for Cape Hatteras, North Carolina calls for 7 - 10 foot waves on Saturday, and 9 - 13 foot waves on Sunday.
Julia
Hurricane Julia put on a remarkable and unexpected burst of intensification yesterday morning to become the season's fourth Category 4 storm, but is now on a long steadily decline in intensity. The hurricane is currently over waters right at the lower limit for maintaining a hurricane, 26.5°C (80°F), and is undergoing high shear of 20 - 25 knots. While the shear will abate tonight and the water will warm some, Julia is headed towards some very hostile upper-level winds beginning on Friday. These strong winds, courtesy of the upper level outflow from Hurricane Igor, will bring 30 - 45 knots of wind shear to Julia Friday night through Sunday. The high shear should be enough to rapidly weaken Julia over the weekend. Julia is not expected to threaten any land areas.
Elsewhere in the tropics
The ECMWF model develops a new tropical depression a few hundred miles off the coast of Africa 2 - 4 days from now. The GFS and NOGAPS models are suggesting the eastern Caribbean could see a strong tropical disturbance form 6 - 7 days from now.
I'll have an update this afternoon.
Jeff Masters
Reader Comments
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Well, there is a first time for everything. I wouldn't place all my hopes on that. *If* the storm forms (which seems likely) don't ignore it..
How many times in recorded history have there been 3 simultaneous hurricanes in the Atlantic Basin?
I think it is safe to say that everyone who visits this blog benefits in some way - whether through education or entertainment. The blog is far from perfect but, overall, I'd say it has been pretty beneficial to us all.
So it kind of baffles me that some would use this site to try to recruit members to another site they are creating. That is in extremely poor taste in my opinion.
We all have the ability to create our own blogs on WUnderground. Why leave completely when you could simply relocate on the same site, OR better yet, strive to improve this blog??
That strikes me as a great show of disrespect to Dr. Masters. Maybe this is addition by subtraction. Who knows?
8
I chose to follow the patterns that
have been consistant and IF a storm
forms doesn't necessarily mean "Texas"
However, one must always be vigilant
and prepared all year long.
Heck, maybe one day we might actually be able to discuss weather again.
In other news, Igor is the 10th largest Hurricane.
close but not close enough
I know in 2005 there was at least 1 occassion where that occurred, and I believe in 1969 as well
Hang on, portlight! Good job.
Highly recommended: Google Earth flight over Bermuda. I have been virtually on vacation there last night and I've learned a lot about structure und nature of these amazing islands.
Hope, Igor won't be too wild!!
BTW: Side effect for me to stay in this blog is gaining some new vocabulary (I'm German). New findings today: "maul" (from TDoggs exhilarant list of future hurricane names). Another one: "mutiny". I hope the blog will find back to relaxation. Barbara
Listen, I will and did give it a rest. I had no beef with Storm. In fact, I did enjoy reading his stuff. But when I post about weather and get it removed, I take offense. Everyone needs a sense of humor. Including Dewey. Did you go to a peanut free school?
anywho, I keep hearing talk about the GOM/Caribbean system....what sort of time frame are we talking about??? Is this being generated from models? or is something already developing?
Oh, not seasons?
11.
7
and several times before that too ...
Who wants to be best man, and the maid of honor?
That's all I'm stating. Kinda like the people who said Ike wouldn't come here because he was so far north in the Atlantic....
11 is acceptable but i'm actually looking for the number of seasons.
try again
Hey y'all. This was from Houston yesterday...
MEDIUM RANGE MODELS STILL SHOWING A VISITOR IN THE CARIBBEAN ON
DAY 10 (SAT 25TH). ECMWF & GFS SHOWING COMPLETELY DIFFERENT UPPER
LEVEL PATTERN AT THAT TIME (ECMWF A DESERT SW RIDGE & ERN
TROF...GFS AN ERN RIDGE AND WRN TROF).
Haven't looked at all the 12z models today but the 0z's looked to still be calling for this development. Hopefully they will come together on the steering currents before anything does form. Or maybe they have since I've looked?
But I do know what you are saying.....
Well, if you include this one, 9.
Press, Portlight has gone from re-acting to disaters to being prepared and proactive, knowing it's not if but when.
It's amazing!!
Wow... that was QUICK.
GFS has been developing a storm in the Caribbean on almost every run for nearly a week. Most of those runs have been into the Gulf (not all, however), and the strengths have varied. The timeframe is within the next 1-2 weeks, very roughly. It sounds like other models have started to catch on to this.
10 seasons
GFS continues to develop a Caribbean/Gulf system.
11.
And they were:
August 17, 1893 0Z - August 24, 1893 12Z
September 12, 1926 12Z - September 14, 1926 0Z
August 31, 1950 0Z - August 31, 1950 6Z
September 2, 1950 12Z - September 4, 1950 18Z
September 7, 1961 0Z - September 12, 1961 6Z
September 10, 1967 6Z - September 11, 1967 0Z
September 12, 1967 0Z - September 12, 1967 6Z
September 14, 1967 12Z - September 16, 1967 6Z
September 8, 1980 6Z - September 8, 1980 18Z
August 30, 1995 18Z - August 31, 1995 12Z
September 23, 1998 18Z - September 27, 1998 18Z
(I posted this a couple of hours ago)
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