Dr. Jeff Masters' WunderBlog

A rare triple threat: three simultaneous Atlantic hurricanes
Posted by: Dr. Jeff Masters, 08:47 PM GMT del 16 Settembre 2010 +4
For the first time in twelve years, we have a rare triple threat in the Atlantic--three simultaneous hurricanes. Hurricane Karl joined Hurricanes Igor and Julia in the steadily expanding Hurricanes of 2010 club this morning, becoming the sixth hurricane of the season. The last time we had three simultaneous hurricanes in the Atlantic was in 1998. That year also had four simultaneous hurricanes--Georges, Ivan, Jeanne and Karl--for a brief time on September 25. There has been just one other case of four simultaneous Atlantic hurricanes, on August 22, 1893. According to Phil Klotzbach at Colorado State, three simultaneous Atlantic hurricanes is a rare phenomena, having occurred only eight other times since 1851. The other years were 1893, 1926, 1950, 1961, 1967, 1980, 1995, and 1998.


Figure 1. Triple trouble: From left to right, Hurricanes Karl, Igor, and Julia roil the Atlantic. Image credit: NASA/GSFC.

Karl
Hurricane Karl continues to intensify. The latest Hurricane Hunter flight, flying at 12,000 feet, found flight level winds of 95 mph. This suggests surface winds of 85 mph, though the top surface winds seen by their SFMR instrument were about 80 mph. Mexican radar out of Alvarado shows the outer spirals bands of Karl are dumping heavy rains on the Mexican coast along the Bay of Campeche.


Figure 2. Afternoon radar image from the Alvarado, Mexico radar. The eye of Karl is visible in the upper right, and rain bands are affecting the coast to the east of the radar site. Image credit: Mexican Weather Service..

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 Category 2 hurricane before making landfall between Tampico and Vercruz, Mexico Friday afternoon. Karl is a small storm, and is unlikely to bring any rain or wind to Texas.

Igor
The Air Force Hurricane Hunters made their first foray into Hurricane Igor this afternoon, and found a high-end Category 3 storm, with a central pressure of 940 mb and top winds at 10,000 feet of 150 mph. The southwest portion of the eyewall was open, so Igor has the potential to intensify once again if it can close off the gap. There are no major changes to the track or intensify forecast for Igor in the latest set of model runs. Igor is expected to remain a major hurricane for the next two days, and is headed northwest at 7 mph. 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 65 mph, gusting to 81 mph, with a significant wave height of 38 feet (the significant wave height is the average of the highest 1/3 of the waves.)

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 is suggesting the eastern Caribbean could see a tropical depression 6 - 7 days from now.

I'll have an update Friday morning.

Jeff Masters
Categories: Hurricane
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101. CybrTeddy 09:29 PM GMT del 16 Settembre 2010    
Eye appearing on Hurricane Karl.
Member Since: Luglio 8, 2005 Posts: 253 Comments: 20228
102. TropicalAnalystwx13 09:30 PM GMT del 16 Settembre 2010    
If Igor is the 10th largest hurricane/TC, I'd love to see what the largest is:

Member Since: Luglio 6, 2010 Posts: 89 Comments: 25274
103. aspectre 09:30 PM GMT del 16 Settembre 2010    
HurricaneKarl's heading had turned southward to (7.8degrees west of) WestSouthWest
from its previous heading of dueWest
H.Karl's average speed moving between its last 2 reported positions was ~9mph(~14.5km/h)

15Sep 09pmGMT - - 19.0n89.4w - - 45mph - - - 997mb - - NHC.Adv.#5
16Sep 12amGMT - - 19.2n90.1w - - 40mph - - 1000mb - - #5A
16Sep 03amGMT - - 19.4n90.7w - - 40mph - - 1000mb - - #6
16Sep 06amGMT - - 19.7n91.2w - - 40mph - - 1000mb - - #6A
16Sep 09amGMT - - 19.8n91.6w - - 50mph - - 1000mb - - #7
16Sep 12pmGMT - - 19.6n92.1w - - 65mph - - - 986mb - - ???
??? 12:30pmGMT - - 19.7n92.2w - - 65mph - - - 987mb - - #8
16Sep 03pmGMT - - 19.7n92.8w - - 75mph - - - 983mb - - #9
16Sep 06pmGMT - - 19.7n93.3w - - 75mph - - - 983mb - - #9A
15Sep 09pmGMT - - 19.6n93.7w - - 80mph - - - 977mb - - #10

Copy &paste 19.0n89.4w, 19.2n90.1w, 19.4n90.7w, 19.7n91.2w, 19.8n91.6w-19.7n92.2w, 19.7n92.2w-19.7n92.8w, 19.7n92.8w-19.7n93.3w, 19.7n93.3w-19.6n93.7w, tam, ver, cun, 19.6n93.7w-19.02n95.97w into the GreatCircleMapper for a look at the last 12*hours.

Using straightline projection upon the speed&heading averaged
over the 3hours spanning the last two reported positions:
~17hours from now to AntonLizardo,Veracruz,Mexico
southeast of Boca del Rio

* The westernmost line-segment is the straightline projection.
Member Since: Agosto 21, 2007 Posts: 0 Comments: 4846
104. Cotillion 09:30 PM GMT del 16 Settembre 2010    
You know, despite the Ninos, we've seen and the warm PDO recently and the usual higher storm numbers in the East Pacific....

Since 1998, only 3 seasons have the EPAC had more named storms than the Atlantic.

2000, 2006 and 2009 (a few seasons were tied, though).
Member Since: Agosto 23, 2008 Posts: 7 Comments: 5300
105. bigwes6844 09:30 PM GMT del 16 Settembre 2010    
Quoting gordydunnot:
No mention of the Igor/ Julia love story so I guess it ain't happening.

there breaking up
Member Since: Luglio 25, 2010 Posts: 0 Comments: 1384
106. CybrTeddy 09:30 PM GMT del 16 Settembre 2010    
Eye is very visible on IR.
Member Since: Luglio 8, 2005 Posts: 253 Comments: 20228
107. hydrus 09:30 PM GMT del 16 Settembre 2010    
Quoting weathermancer:


That means a pretty darn deep storm for Newfoundland.
There are several models that show Igor transitioning into a mammoth extra-tropical cyclone in that area of the world.Link
Member Since: Settembre 27, 2007 Posts: 1 Comments: 14252
108. weathermanwannabe 09:31 PM GMT del 16 Settembre 2010    
Quoting CybrTeddy:
89. Obviously, Mitch is no longer the strongest storm in October. Matter of fact, the strongest storm ever recorded in the Atlantic occurred in October, Wilma.


You are correct.......That is from the NOAA page after the 98 season and it was not updated after that year...........
Member Since: Agosto 8, 2006 Posts: 0 Comments: 6687
109. unf97 09:32 PM GMT del 16 Settembre 2010    
Quoting hydrus:
It is my belief by this time next week there should be two systems, one in the Caribbean Sea and one in the Atlantic. Both of them should be hurricanes within ten days. The Caribbean system the stronger of the two. This is just guesswork right now, but it seems reasonable with the MJO upward motion returning and the current model
forecasts.


Yes, I agree with you. Gradually, we are finally beginning to see a shift in the pattern.
Member Since: Settembre 25, 2007 Posts: 0 Comments: 1193
110. 1900hurricane 09:32 PM GMT del 16 Settembre 2010    
Quoting TropicalAnalystwx13:
If Igor is the 10th largest hurricane/TC, I'd love to see what the largest is:


Yeah, Igor is a behemoth!
Member Since: Agosto 2, 2006 Posts: 43 Comments: 10359
112. Dakster 09:33 PM GMT del 16 Settembre 2010    
Quoting weathermanwannabe:


Those La Nina years have tended to produce several fish storms, because of the "higher" tracks at some point, but you also have several CV storms that can bust through into the Caribbean.......The Caribbean and US is not out of the woods yet by any means until this season is actually OVER.


I agree... Seasons are like fingerprints, each one is unique in its own way.
Member Since: Marzo 10, 2006 Posts: 0 Comments: 4932
113. StormJunkie 09:33 PM GMT del 16 Settembre 2010    
Ok y'all, taking Michale to Cracka Barrel for dinner. Play nice, have fun...

Long live the


See everyone this evening.

Member Since: Agosto 17, 2005 Posts: 26 Comments: 15218
114. Cotillion 09:33 PM GMT del 16 Settembre 2010    
Quoting TropicalAnalystwx13:
If Igor is the 10th largest hurricane/TC, I'd love to see what the largest is:



In terms of gale force diameter, Faith I believe (not too surprising, as TCs typically get bigger as they get higher in latitude... and you can't get much higher than Faith while still being tropical).
Member Since: Agosto 23, 2008 Posts: 7 Comments: 5300
115. hydrus 09:33 PM GMT del 16 Settembre 2010    
Quoting CybrTeddy:
Eye appearing on Hurricane Karl.
I would not rule out the possibility of Karl becoming a strong three or a weak four before landfall. You know how fast these little storms can crank up. Charley is a good example.
Member Since: Settembre 27, 2007 Posts: 1 Comments: 14252
117. Neapolitan 09:34 PM GMT del 16 Settembre 2010    
Quoting CybrTeddy:
As of September 16th from greatest to least, seasonal activity in the last 15 years.

2005: 15-8-4
1995: 13-7-3
2010: 11-6-4
2004: 11-5-4
2008: 10-5-3
2003: 9-5-2
1999: 8-6-4*
1996: 8-6-4*
2006: 8-4-2
2007: 8-3-2
2000: 8-3-1
1998: 7-4-2
2001: 7-3-2
2009: 6-2-2
1997: 5-3-1


One thing interesting to note: September 1995 had only three named storms, while September 2005 had five.
Member Since: novembre 8, 2009 Posts: 4 Comments: 11148
118. StormJunkie 09:35 PM GMT del 16 Settembre 2010    
Quoting KerryInNOLA:
Does anybody know what the 384 hr 12z GFS shows on that potential GOM system? I can't get it to run in my browser. Thanks.


last run was NOLA, 18z should be coming out over the next hour.
Member Since: Agosto 17, 2005 Posts: 26 Comments: 15218
119. QMiami 09:35 PM GMT del 16 Settembre 2010    
Thank you admin this blog is back to the way it used to be and should be - weather only.

Julia is racing to the wnw at 25mph
Member Since: Maggio 12, 2010 Posts: 0 Comments: 124
120. TropicalAnalystwx13 09:35 PM GMT del 16 Settembre 2010    
Quoting Neapolitan:


One thing interesting to note: September 1995 had only three named storms, while September 2005 had five.


Yep, and we're already at 5 named storms for this month (Gaston, Hermine, Igor, Julia, Karl)
Member Since: Luglio 6, 2010 Posts: 89 Comments: 25274
121. Hurricanes101 09:36 PM GMT del 16 Settembre 2010    
116. KerryInNOLA 9:33 PM GMT on September 16, 2010

0Z and 6Z GFS shows Florida as the target
12Z takes the system to LA/MS
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122. CybrTeddy 09:36 PM GMT del 16 Settembre 2010    
Hurricane GRETA (1956) was the largest Atlantic tropical cyclone ever recorded, it had Tropical Storm Force winds spanning out over a area of 1,200 miles.
Member Since: Luglio 8, 2005 Posts: 253 Comments: 20228
123. Ldog74 09:37 PM GMT del 16 Settembre 2010    
Quoting weathermanwannabe:


You are correct.......That is from the NOAA page after the 98 season and it was not updated after that year...........


However the statement is still technically correct. "Mitch was". Its probably a good thing that Karl continues to shift southward, gives him much less time to get his act together. Igor has really expanded hasn't he. The way he did that is as impressive as his original bout of strengthening to me. At least the blog has slowed for the time being, even if it is only because no storms are threatening the US coast.
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125. Jedkins01 09:39 PM GMT del 16 Settembre 2010    
I wouldn't be surprised if Karl becomes a major hurricane before making landfall! It's getting its act together in a hurry, plus its about the side of Charley, and Charley intensified from a 100 mph category 2 to a 145 mph category 4 in just 2 hours!

Not saying it will blow up that fast, but the small size and great atmospheric conditions may lead to rapid intensification before landfall tonight.
Member Since: Agosto 21, 2008 Posts: 0 Comments: 5333
127. SLU 09:41 PM GMT del 16 Settembre 2010    
Largest Atlantic hurricanes by TS force winds diameter

1 Faith 1966
2 Gabrielle 1989
3 Igor 2010
4 Unnamed 1971
5 Gilbert 1988
6 Isabel 2003
7 Doris 1975
8 Ella 1978
9 Debby 1982
10 Esther 1961
Member Since: Luglio 13, 2006 Posts: 11 Comments: 2846
128. LongBeachNY 09:41 PM GMT del 16 Settembre 2010    
TORNADO WARNING FOR NYC!!!!

Coming right at me!!!!

Second time this year though there was no tornado the first time.
Member Since: Giugno 18, 2010 Posts: 0 Comments: 45
129. carlos1993 09:42 PM GMT del 16 Settembre 2010    
Quoting sammywammybamy:
82 Years Ago this Date, The Second Worst Natural Disaster in American History...



It Hit Puerto Rico as a Cat5 and South Florida as a Cat 4.

After leaving the Caribbean, the hurricane moved across the Bahamas as a strong Category 4 hurricane. It continued to the west-northwest, and made landfall in southern Florida on the evening of September 16 (or early on September 17 Universal Time).[3] Initially, Richard Gray of the U.S. Weather Bureau was optimistic that the storm would spare the south Florida region.[5] Atmospheric pressure at landfall was measured at 929 mbar (hPa),[6] and maximum sustained winds were near 150 mph (240 km/h).[3] The eye passed ashore in Palm Beach County near West Palm Beach, then moved directly over Lake Okeechobee.[3] Peak gusts were estimated near 160 mph (260 km/h) at Canal Point, Florida.[2] The hurricane's path turned northeast as it crossed Florida, taking it across northern Florida, eastern Georgia, and the Carolinas on September 19. It then moved inland and merged with a low-pressure system around Toronto on the 20th.[3]


In south Florida at least 2,500 were killed when a storm surge from Lake Okeechobee breached the dike surrounding the lake, flooding an area covering hundreds of square miles.[1] In total, the hurricane killed at least 4,078 people and caused around US$100 million ($1.27 billion 2010 USD) in damages over the course of its path.

Here in PR that Hurricane was known as San Felipe II.
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130. thewindman 09:42 PM GMT del 16 Settembre 2010    
Small Hurricanes can get going real fast. Now that the eye is showing up I think in 6 hours we will be at 115
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131. hydrus 09:42 PM GMT del 16 Settembre 2010    
Quoting CybrTeddy:
Hurricane GRETA (1956) was the largest Atlantic tropical cyclone ever recorded, it had Tropical Storm Force winds spanning out over a area of 1,200 miles.
And in the month of November"wow" This is a VERY interesting and informative Link
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133. HCW 09:43 PM GMT del 16 Settembre 2010    
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135. bigwes6844 09:43 PM GMT del 16 Settembre 2010    
anybody guessing how many storms we mite have at the end of the year
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136. weathermanwannabe 09:44 PM GMT del 16 Settembre 2010    
If you look at how low sheer generally is at the moment in the MDR, and how high water temps remain, this season is far from over.....It will not "truly" end until sheer levels rise and temps fall...A few recent seasons shut down early due to sheer levels rising at the end of September but I think this season will be different per some of the long term sheer models......October will probably spin up several storms and maybe even a few in November........Time will tell.
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138. Tazmanian 09:44 PM GMT del 16 Settembre 2010    
Quoting bigwes6844:
anybody guessing how many storms we mite have at the end of the year



20 storms + the way thing are going
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139. GeoffreyWPB 09:46 PM GMT del 16 Settembre 2010    
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141. weathermanwannabe 09:47 PM GMT del 16 Settembre 2010    
Have to pick-up the little one from Ballet...See everyone tommorow....WW
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142. HCW 09:47 PM GMT del 16 Settembre 2010    
IGOR and his friend
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143. washingtonian115 09:48 PM GMT del 16 Settembre 2010    
Karl looks great.And Luckily Igor is weakning before paying a visit to bermuda.
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144. Tazmanian 09:48 PM GMT del 16 Settembre 2010    
Quoting HCW:
Karl




thats Igor
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145. Cotillion 09:49 PM GMT del 16 Settembre 2010    
Quoting bigwes6844:
anybody guessing how many storms we mite have at the end of the year


Still sticking to 16-17.

The rate of activity will eventually begin to slow down. Possibly after Karl (or Lisa if the models are right), there might be a bit of a lull for a week or two (every season has a lull - just varies how long and what consists of that lull - one storm alone would be a lull compared to the activity of the last 3 weeks).
Member Since: Agosto 23, 2008 Posts: 7 Comments: 5300
146. StormJunkie 09:49 PM GMT del 16 Settembre 2010    
Quoting KerryInNOLA:
I'm talking about the 12z on Allan Huffman's site. Can't get it to work.


The 12z had it in Nolaq. Not pulling your leg. But that is almost a good thing as that track will jump around a lot in the next 330hrs.

It's hard to hit that tiny + on the Droid...
Member Since: Agosto 17, 2005 Posts: 26 Comments: 15218
147. tkeith 09:49 PM GMT del 16 Settembre 2010    
Quoting Tazmanian:



thats Igor
and Julia...
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148. GeoffreyWPB 09:50 PM GMT del 16 Settembre 2010    
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149. FSUCOOPman 09:50 PM GMT del 16 Settembre 2010    
Link

Umm, RUN!!!!! :-P

I guess something went A LITTLE wrong when making this map...
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151. Hurricanes101 09:50 PM GMT del 16 Settembre 2010    
Quoting Cotillion:


Still sticking to 16-17.

The rate of activity will eventually begin to slow down. Possibly after Karl (or Lisa if the models are right), there might be a bit of a lull for a week or two (every season has a lull - just varies how long and what consists of that lull - one storm alone would be a lull compared to the activity of the last 3 weeks).


forecast models have been showing Lisa and Matthew in the next 6-10 days; "Matthew" lasts until the first week of October. I doubt there will be a lull, maybe after that one
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About JeffMasters
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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