Karl hits the Yucatan; two simultaneous Cat 4s in the Atlantic for 2nd time in history

By: Dr. Jeff Masters , 2:37 PM GMT on September 15, 2010

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The Atlantic hurricane season of 2010 kicked into high gear this morning, with the landfall of Tropical Storm Karl in Mexico, and the simultaneous presence of two Category 4 hurricanes in the Atlantic, Igor and Julia. Tropical Storm Karl's formation yesterday marked the fifth earliest date that an eleventh named storm of the season has formed. The only years more active this early in the season were 2005, 1995, 1936 and 1933. This morning's unexpected intensification of Hurricane Julia into a Category 4 storm with 135 mph winds has set a new record--Julia is now the strongest hurricane on record so far east. When one considers that earlier this year, Hurricane Earl became the fourth strongest hurricane so far north, it appears that this year's record SSTs have significantly expanded the area over which major hurricanes can exist over the Atlantic. This morning is just the second time in recorded history that two simultaneous Category 4 or stronger storms have occurred in the Atlantic. The only other occurrence was on 06 UTC September 16, 1926, when the Great Miami Hurricane and Hurricane Four were both Category 4 storms for a six-hour period. The were also two years, 1999 and 1958, when we missed having two simultaneous Category 4 hurricanes by six hours. Julia's ascension to Category 4 status makes it the 4th Category 4 storm of the year. Only two other seasons have had as many as five Category 4 or stronger storms (2005 and 1999), so 2010 ranks in 3rd place in this statistic. This year is also the earliest a fourth Category 4 or stronger storm has formed (though the fourth Category 4 of 1999, Hurricane Gert, formed just 3 hours later on today's date in 1999.) We've also had four Cat 4+ storms in just twenty days, which beats the previous record for shortest time span for four Cat 4+ storms to appear. The previous record was 1999, 24 days (thanks to Phil Klozbach of CSU for this stat.)


Figure 1. A rare double feature: two simultaneous Category 4 hurricanes in the Atlantic, for only the second time in recorded history.

Karl
Tropical Storm Karl made landfall as a strong tropical storm with 65 mph winds and a central pressure of 991 mb at 8:45am EDT this morning on Mexico's Yucatan Peninsula, just north of the Belize border. Karl took advantage of nearly ideal conditions for intensification, and in just fifteen hours intensified from a tropical disturbance to a strong tropical storm with 65 mph winds. Had Karl managed to get its act together just one day earlier, it could have been a major hurricane at landfall this morning. Fortunately, Karl has a relatively small area of strong winds--tropical storm force winds extend out just 45 miles from the center of the storm, and wind damage is not the main concern. Heavy rains are the main concern, and Belize radar shows heavy rain bands from Karl spreading ashore over northern Belize near the border with Mexico. Cancun radar shows that heavy rains are relatively limited, though, near the tourist havens of Cancun and Cozumel.


Figure 2. Radar image of Karl at landfall this morning near the northern Belize/Mexican border. Image credit: Belize National Meteorological Service.

Forecast for Karl
Karl will traverse the Yucatan Peninsula today and emerge into the Gulf of Mexico's Bay of Campeche Thursday morning as a much weakened tropical storm, with perhaps 40 - 45 mph top winds. Once in the Gulf, conditions for intensification are ideal, with wind shear is expected to be low, 5 - 10 knots, SSTs will be 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 strong tropical storm or a Category 1 hurricane before making landfall between Tampico and Vercruz, Mexico on Saturday morning. However, since Karl is a small storm, it is possible that passage over the Yucatan will disrupt the storm enough so that it will be much weaker. The ridge of high pressure steering Karl westwards is quite strong, and it is very unlikely that the storm will turn northwest and hit Texas. NHC is giving Brownsville, Texas, an 10% chance of receiving tropical storm force winds of 39+ mph.

Igor
Hurricane Igor put on a burst of intensification last night to put it at its strongest yet, a top-end Category 4 hurricane with 155 mph winds. Igor has weakened slightly this morning, but remains a formidable presence in the Central Atlantic with its 145 mph winds. Igor continues to show the classic appearance of a major hurricane on satellite imagery, with a well-formed eye, symmetrical cloud pattern, plenty of low-level spiral bands, and solid upper-level outflow on all sides.


Figure 3. Hurricane Igor as captured at 18 UTC Tuesday September 14, 2010, from the International Space Station. Image credit: Douglas Wheelock, NASA.

Intensity forecast for Igor
Wind shear is low, 5 - 10 knots, and is expected to remain low for the next 2 - 3 days. Waters are warm, 29°C, and will remain 29°C for the next 2 - 3 days. Igor is well armored against any intrusions of dry air for at least the next three days. These conditions should allow Igor to remain at major hurricane status for the next three 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, and may be responsible for the 10 mph weakening Igor experienced early this morning. Igor may regain its lost intensity over the next 36 hours. 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, weakening it. The SHIPS models predicts shear will rise to the high range, 20 - 30 knots, during the final 24 hours of the storm's approach to Bermuda. Igor will also be tracking over cooler 28°C waters during this period, and substantial weakening by perhaps 20 - 30 mph can be expected. Igor will still probably be at least a Category 2 hurricane on its closest pass by Bermuda on Sunday. NHC is giving Bermuda a 13% 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 - 25 foot waves in the offshore waters.

Track forecast for Igor
The track forecast for Igor remains unchanged. Igor has made its long-anticipated turn to the 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 several hundred miles to the northeast of the Lesser Antilles, and high waves should be the only impact of Igor on the islands. Igor appears likely to be a threat to Bermuda, and that island can expect tropical storm force winds as early as Saturday. Igor will be moving at about 12 - 15 mph as it approaches Bermuda. Tropical storm force winds of 39+ mph will probably extend out about 250 miles to the north of Igor on Saturday, so Bermuda can expect 18 hours of tropical storm force winds before the core of Igor makes its closest pass. In all, Bermuda is likely to experience a very long pounding of 24 - 36 hours with winds in excess of tropical storm force.

The models have been in substantial agreement over multiple runs that Igor will miss the U.S. East Coast, and the danger to the U.S. will probably only come in the form of high waves. Large swells from Igor have arrived in the Northern Lesser Antilles Islands, and will spread westwards over the next few days, reaching the U.S. East Coast on Friday. 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 8 - 10 foot waves on Saturday, and 9 - 12 foot waves on Sunday.

Igor may pass very close to Newfoundland, Canada, but it is too early too assess the likelihood of this happening.

Julia
Hurricane Julia put on a remarkable and unexpected burst of intensification this morning to become the season's fourth Category 4 storm. Julia's 135 mph winds make it the strongest hurricane on record so far east; the previous record was held by the eighth storm of 1926 which was only a 120 mph Category 3 hurricane at Julia's current longitude. Julia's intensification was a surprise, since SSTs in the region are about 27.5°C, which is just 1°C above the threshold needed to sustain a Category 1 hurricane. Julia is headed northwest, out to sea, and it is unlikely that this storm will trouble any land areas. SSTs will steadily cool to 26.5°C today, and further intensification today is unlikely. Shear will be moderate, 10 - 20 knots, over Julia during the next two days, then rise sharply to 30 knots 3 - 5 days from now, as Julia moves within 1000 miles of Igor and begins to experience strong northwesterly winds from her big brother's upper level outflow. This should substantially weaken Julia.

Elsewhere in the tropics
The GFS and ECMWF models develop a new tropical depression a few hundred miles off the coast of Africa 3 - 6 days from now. The GFS also develops a tropical depression in the eastern Caribbean 6 - 7 days from now.

Portlight's 2-year anniversary
On September 14, 2008, the devastation wrought by Hurricane Ike on Texas and Louisiana moved members of the wunderground community to put into action their own impromptu relief effort. From this humble beginning has grown a disaster-relief charity I have been proud to support--Portlight.org. We've been blessed this hurricane season with relatively few landfalling storms, so Portlight's new disaster relief trailer (Figure 4), financed with a $21,500 grant from the Christopher and Dana Reeve Foundation, has yet to be deployed. With five weeks of peak hurricane season still to come, the new trailer may yet get a call to action. The mobile kitchen in the trailer will be able to feed several hundred people per day, and the trailer is equipped with portable ramps to help with shelter accessibility, as well as durable medical equipment to facilitate mobility and independence for survivors. The trailer is mobile, and Portlight is willing to load it up and fly it to Bermuda, if Igor ends up making a mess there!

The lack of landfalling storms has allowed Portlight to continue to concentrate their efforts on Haiti, where their assistance has been a tremendous boost for those most in need, the disabled. Portlight is working on constructing steel shelters out of shipping containers for homeless Haitians, as detailed in the Haitian Relief Recap blog post. Please visit the Portlight.org web site or the Portlight blog to learn more and donate. A few other items of note:

Portlight has been able to facilitate providing assistance to people with disabilities in Pakistan, where the worst natural disaster in their history has left 4 million homeless. While not directly involved in delivering relief, Portlight has been able to connect local Disabled People's Organizations with important sources of food, water, filtration systems, and medical equipment.

ABC News4 in Charleston broadcast a story about the Portlight relief trailer, and Portlight has also been featured on the Pacifica Radio Network.

Portlight launched a quarterly newsletter, The Portlight View, which can be seen on the newly redesigned website.


Figure 4. The new Portlight disaster relief trailer, funded by their $21,500 grant from the Christopher and Dana Reeve foundation.

I'll have an update Thursday morning.

Jeff Masters

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1586. pottery
Quoting Patrap:



A screen grab from the GRIP Real Time Mission Monitor (RTMM) system shows the Global Hawk and DC-8 flying in formation across Hurricane Earl on Thursday, Sept. 2, for one of the first times. Thursday’s flight marked the first time the Global Hawk flew over a hurricane. The drone’s extended flight range has scientists excited to observe hurricanes for unprecedented periods of time.
Credit: NASA

You have any specs on the drone?
Would love to see them...
Member Since: October 24, 2005 Posts: 0 Comments: 24788
1585. JLPR2


Impressive, that's from Igor!
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right nolehead!
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Quoting JLPR2:
Looks like 94L is on the making.

nos va partir por el mismo medio
Member Since: April 7, 2010 Posts: 5 Comments: 347
1582. leo305
Quoting charliesurvivor:
anybody notice the due west wobble of igor along 20 north the last couple of frames?That trough really looks lame!


that's the small eye spinning around the larger eye giving it that effect, in reality the system is barely moving
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Quoting Chicklit:
hey, evening. from the latest model runs, looks like igor will go well east of bermuda.

Keeping our fingers crossed anyway Chicklit
Member Since: August 17, 2010 Posts: 21 Comments: 6939
hey, evening. from the latest model runs, looks like igor will go well east of bermuda.

might want to tell that to Iggy himself..looks like he's going just a tad bit west of the next spot from the NHC
Member Since: June 3, 2008 Posts: 0 Comments: 1934
Quoting leo305:
igor's "eye" is spinning around the large eye which is becoming more apparent on satellite

I'm sorry, but I don't see an EWRC happening. I see a continuation of the same ole Igor.
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anybody notice the due west wobble of igor along 20 north the last couple of frames?That trough really looks lame!
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1577. Patrap



A screen grab from the GRIP Real Time Mission Monitor (RTMM) system shows the Global Hawk and DC-8 flying in formation across Hurricane Earl on Thursday, Sept. 2, for one of the first times. Thursday’s flight marked the first time the Global Hawk flew over a hurricane. The drone’s extended flight range has scientists excited to observe hurricanes for unprecedented periods of time.
Credit: NASA
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UW - CIMSS
ADVANCED DVORAK TECHNIQUE
ADT-Version 8.1.1
Tropical Cyclone Intensity Algorithm

----- Current Analysis -----
Date : 15 SEP 2010 Time : 231500 UTC
Lat : 20:00:36 N Lon : 55:56:14 W


CI# /Pressure/ Vmax
6.2 / 944.1mb/119.8kt


Final T# Adj T# Raw T#
6.2 6.4 6.4



round 3 LOL this thing sure is trying hard to be come a cat 5 i noted that T # are going back up
Member Since: May 21, 2006 Posts: 5091 Comments: 115436
hey, evening. from the latest model runs, looks like igor will go west of bermuda.

Member Since: July 11, 2006 Posts: 14 Comments: 11407
Karl still a TS. A minimal one, but a TS nonetheless: 35 knots/1000 mb:

AL, 13, 2010091600, , BEST, 0, 192N, 901W, 35, 1000, TS, 34, NEQ, 0, 0, 50, 50, 1009, 120, 10, 0, 0, L, 0, , 0, 0, KARL, D
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Quoting btwntx08:
how about u call it son karl doesnt look babyish to me
Fine. As long as son is informed & doesn't have babies of his own.
Member Since: August 17, 2010 Posts: 21 Comments: 6939
1572. Patrap
NASA Tops Off Earl Research with Historic Global Hawk Flight




NASA’s DC-8 flew to Hurricane Earl four times in the past week to collect data as the storm both strengthened and weakened. This image shows one of the DC-8’s passes through the eye of Earl on Aug. 30. NASA’s Genesis and Rapid Intensification Processes (GRIP) experiment was designed to collect new data on how hurricanes form and how they strengthen and weaken, which remain elusive questions for hurricane scientists.
Credit: NASA/Jane Peterson
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1571. alfabob
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1570. ackee
Quoting Neapolitan:


Agreed. PGI45L should get some color tomorrow, if not this evening...
which one of these systems is the GFS devloping
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No reports from:

KanKunKatKarlKatastrophe.....

rumor is that he evacuated to radar station below:

radar on the east side of the Bay of Campeche
Member Since: July 12, 2007 Posts: 0 Comments: 6069
has anybodyelse tried clicking on the rich text button and submitting anything? i no longer have link or image buttons and i deleted all temp fuiles crazy??
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Quoting pottery:

TRue, True!!!
Had some nice weather today with all rains passing north and south of us and leaving us gasping for breath in the humidity.
Had to work outside all day, so I'm frazzled...


I know what you mean, I install doors every day in it. The last couple of days have been nice though. Hot, but low humidity. I'll take it.
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Quoting F4PHANTOM:
and Karl needs to stay a baby!!!!
Yeppers
Member Since: August 17, 2010 Posts: 21 Comments: 6939
nop ecmwf
Member Since: July 13, 2008 Posts: 6 Comments: 10796
I think this season is so far so good. May it continue that way in spite of the models . If we have a landfall we will deal with it like we always do, pick ourselves up and go on. In the meantime we should try to be responsible in our forecasts and predictions. There is enough fear in America right now without silly guesses in the future.
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Quoting dracko19:


From Wikipedia:
"..Annular hurricanes are axisymmetric — symmetric along every radial axis, i.e. very circular in appearance. They lack the spiralform rainbands which are characteristic of typical tropical cyclones. After reaching peak intensity, they weaken much more slowly than non-annular storms of similar intensity. However, most annular hurricanes have annular characteristics for only a portion of their lifetimes."

Paka did have a period of time where there were hardly any rainbands.

Thanks
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1562. leo305
igor's "eye" is spinning around the large eye which is becoming more apparent on satellite
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1561. Patrap
Quoting bassis:
Pat,

thanks for all the educational info you posted .

Would love to see the results of GRIPS on Earl (was another vid linked to the hot towers vid)


Thats the best part of the Wunderground, the sharing.

.."I believe"..
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how about u call it son karl doesnt look babyish to me
Member Since: July 13, 2008 Posts: 6 Comments: 10796
Quoting ackee:
which model has proformed the best so far this seasons

A GFS
B ECMWF
C CMC
D NOGAPS


Surprising, the GFS, hi, all BTW.
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1558. bassis
Pat,

thanks for all the educational info you posted .

Would love to see the results of GRIPS on Earl (was another vid linked to the hot towers vid)
Member Since: September 8, 2008 Posts: 0 Comments: 423
1557. pottery
Quoting doorman79:


Good. If it was bad you wouldn't want to hear it anyway lol

TRue, True!!!
Had some nice weather today with all rains passing north and south of us and leaving us gasping for breath in the humidity.
Had to work outside all day, so I'm frazzled...
Member Since: October 24, 2005 Posts: 0 Comments: 24788
1556. angiest
Kudos to TWC for covering the severe weather in Kansas.
Member Since: August 26, 2006 Posts: 16 Comments: 4766
Quoting cat5hurricane:
One happy family
and Karl needs to stay a baby!!!!
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1554. alfabob
Shouldn't the NHC be issuing TS watches for those islands west of Igor? Buoy west and a little north of Igor (21.652 N 58.695 W):

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Quoting PcolaDan:
Well, I found a radar on the east side of the Bay of Campeche, but...... not sure it helps much. :)


lol knew it wasnt working
Member Since: July 13, 2008 Posts: 6 Comments: 10796
1552. FLdewey
If you love Florida hurricanes won't keep you from owning a house. My parents have owned the same house 1/2 mile from the beach in Indialantic since 1978... never sustained any major damage.

No worries. :-)
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Quoting JLPR2:
Looks like 94L is on the making


Agreed. PGI45L should get some color tomorrow, if not this evening...
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Quoting dracko19:
Papa Igor, Mama Julia and Baby Karl


One happy family
Member Since: August 17, 2010 Posts: 21 Comments: 6939
1549. angiest

Quoting taco2me61:

I gree it does show something very "Interesting" to say the least....

taco :o)
Yeah, that is interesting...
Member Since: August 26, 2006 Posts: 16 Comments: 4766
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Quoting pottery:

How you doing today, Doorman?


Good. If it was bad you wouldn't want to hear it anyway lol
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1546. Mikla
This is also a good link to have on favorites:

http://www.ssd.noaa.gov/PS/TROP/TCFP/index.html
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Outer feeder bands (very cold tops) starting to organize 60-70 nautical miles out in NW, NE quadrant...
Member Since: August 17, 2010 Posts: 21 Comments: 6939
A site I find useful: Link
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1543. pottery
Quoting doorman79:


Hiya Pottery :)

How you doing today, Doorman?
Member Since: October 24, 2005 Posts: 0 Comments: 24788
Quoting pottery:
Good Evening all.
For people who watch and marvel at Hurricanes, this is surely a Good Day!


Hiya Pottery :)
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Quoting shawn26:
The latest GFS run is scary

I agree it does show something very "Interesting" to say the least....

Taco :o)
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Papa Igor, Mama Julia and Baby Karl


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1539. JLPR2
Looks like 94L is on the making.

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Good evening all
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1537. angiest
Quoting pilotguy1:


Oh no we are doomed.

No, it's "We are all doom."

Member Since: August 26, 2006 Posts: 16 Comments: 4766
Quoting Patrap:


Well Im a Tad behind on Sports news seems.

They have been missed,,I used to go to the Arena and watch them a lot.


Don't feel bad, I wouldn't have known if not for hearing it on the radio at work :)
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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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