Dr. Jeff Masters' WunderBlog

Late-starting hurricane seasons
Posted by: Dr. Jeff Masters, 2:01 PM GMT on July 29, 2009 +2
Late-starting hurricane seasons--ones where the first named storm of the year doesn't occur until August--have happened in eleven of the fifty years between 1960 - 2009 (a 22% occurrence.) Only two of these eleven seasons ended up with more hurricanes than average (seven or greater). The record for the latest starting hurricane season since 1851 was set in 1914, when the only storm of the season formed on September 15. The year 1941 was also late starting, with the season's first storm arriving on September 11. Of course, we didn't have satellites back then, so it's a good bet there were storms earlier in these seasons that got missed. However, there's a good possibility that 1914 really did have only one storm. A re-analysis of the hurricane activity in the decade 1911-1920 (Landsea et al., 2008) found 1.3 missing tropical cyclones per year, thanks to the inclusion of a new database of ship weather reports called COADS. However, 1914 was not one of those years. Various authors have estimated that we missed an average of between one and three tropical cyclones per year during that time period, so it is quite possible 1914 had only one storm.


Figure 1. The hurricane season of 1914 featured only one tropical storm, and was the latest-starting hurricane season on record (September 15).

The latest dates for the first named storm of the season in the recent past, followed by the number of named storms, hurricanes, and intense hurricanes that year are:

2009 (August 15) 9,3,2
2004 (August 1) 15,9,6
2000 (August 4) 15,8,3
1988 (August 7) 12,6,3
1987 (August 9) 7,3,1
1984 (August 18) 13,5,1
1983 (August 15) 4,2,1
1977 (August 30) 6,5,1
1967 (August 30) 8,6,2
1963 (August 2) 9,6,2
1962 (August 22) 5,3,1

We can also add 1992 to the list if we ignore the unnamed subtropical storm that formed in April of that year. That year had the notorious Hurricane Andrew as its first named storm. Andrew formed on August 17 of that year, and was the only major hurricane in a year that had only seven named storms and four hurricanes. For comparison, an average Atlantic hurricane season has 10 named storms, 6 hurricanes, and 2 intense hurricanes. So, it is a good bet that 2009 will be a below-average season.

References
Landsea, C. W. , D. A. Glenn, W. Bredemeyer, M. Chenoweth, R. Ellis J. Gamache, L. Hufstetler, C. Mock, R. Perez, R. Prieto, J. Sanchez-Sesma, D. Thomas, and L. Woolcock, 2008, A Reanalysis of the 1911-20 Atlantic Hurricane Database", Journal of Climate, 21, p.2138-2168.

Jeff Masters
Categories: Hurricane
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451. Patrap 9:16 PM GMT on July 29, 2009    
The Map is used for track purposes only.
Member Since: July 3, 2005 Posts: 372 Comments: 111610
452. Tazmanian 9:17 PM GMT on July 29, 2009    
Quoting TexasHurricane:
Quoting AllStar17:


El Nino is NOT strengthening rapidly....in fact it seems as though it has peeked and may be weakening.



What does that mean?


hes smoking he dos not not what he is talking about it is not weakening it has not peeked he need to find more INFO too back this up or i will not be leve him at all
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453. mikatnight 9:17 PM GMT on July 29, 2009    
Must be an old Andrew graphic. NHC reclassified it as a 5 at landfall w/ 165mph sustained.
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454. Patrap 9:20 PM GMT on July 29, 2009    
Okay my retentive ones..I replaced the map.

Im a lil off today as the Ol slipped disc required 6 Hours at the VA this day.
Thanks for the Taxes that also provided for my Health Care today.
Hope that covers this post..
LOL
Member Since: July 3, 2005 Posts: 372 Comments: 111610
455. IKE 9:22 PM GMT on July 29, 2009    
Guess the wave exiting Africa got done in kinda....

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456. weathermanwannabe 9:22 PM GMT on July 29, 2009    
Using the Hurricane Database, known as HURDAT, seasonal averages revolving around hurricane seasons which had a fairly late start [first tropical cyclone (TC) forming after July 20] have been compiled. The graphs below show the total number of TCs, number of land-falling TCs, and the number of Florida land-falling TCs from 1940-2008. As expected, there is no major correlation to a late start to the season and characteristics of the season. Several seasons saw 10 or more TCs form with 5 or more landfalls, while other years saw 4 or 5 storms form with just a couple landfalls.
Total
NOAA Stats

According to the charts accompanying this information (too large to post), during this 1940-2008 period, when the first tropical cyclone did not develop until after July 20th...

a) The average number of storms in such a season was 10;

b) The average number of landfalling storms in such a season was 3;

c) The average number of storms making a Florida landfall in such a season was 1;

Food for Thought.
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457. Patrap 9:22 PM GMT on July 29, 2009    
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458. mobilegirl81 9:23 PM GMT on July 29, 2009    
Evaporated! Everyone! Hook up your humidifiers at once!
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459. TexasHurricane 9:24 PM GMT on July 29, 2009    
Quoting jeffs713:

Using the scale on the bottom, the brighter the color (more to the right), the higher the probability of storm formation (by storm, I believe they mean TD or stronger). The colors you see in the CATL and EATL are some of the brightest colors they have used in the Atlantic basin so far this season.


ok, so it is looking more favorable then...?
Member Since: July 2, 2009 Posts: 0 Comments: 2811
460. IKE 9:27 PM GMT on July 29, 2009    
Quoting weathermanwannabe:
Using the Hurricane Database, known as HURDAT, seasonal averages revolving around hurricane seasons which had a fairly late start [first tropical cyclone (TC) forming after July 20] have been compiled. The graphs below show the total number of TCs, number of land-falling TCs, and the number of Florida land-falling TCs from 1940-2008. As expected, there is no major correlation to a late start to the season and characteristics of the season. Several seasons saw 10 or more TCs form with 5 or more landfalls, while other years saw 4 or 5 storms form with just a couple landfalls.
Total
NOAA Stats

According to the charts accompanying this information (too large to post), during this 1940-2008 period, when the first tropical cyclone did not develop until after July 20th...

a) The average number of storms in such a season was 10;

b) The average number of landfalling storms in such a season was 3;

c) The average number of storms making a Florida landfall in such a season was 1;

Food for Thought.


I wonder what it is for Aug. 20th?
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461. SavannahStorm 9:26 PM GMT on July 29, 2009    
Watch as the dry, dusty ULL sucks up the wave's moisture like bathwater down the drain...

Member Since: September 22, 2005 Posts: 18 Comments: 2135
462. jeffs713 9:27 PM GMT on July 29, 2009    
Quoting weathermanwannabe:
Using the Hurricane Database, known as HURDAT, seasonal averages revolving around hurricane seasons which had a fairly late start [first tropical cyclone (TC) forming after July 20] have been compiled. The graphs below show the total number of TCs, number of land-falling TCs, and the number of Florida land-falling TCs from 1940-2008. As expected, there is no major correlation to a late start to the season and characteristics of the season. Several seasons saw 10 or more TCs form with 5 or more landfalls, while other years saw 4 or 5 storms form with just a couple landfalls.
Total
NOAA Stats

According to the charts accompanying this information (too large to post), during this 1940-2008 period, when the first tropical cyclone did not develop until after July 20th...

a) The average number of storms in such a season was 10;

b) The average number of landfalling storms in such a season was 3;

c) The average number of storms making a Florida landfall in such a season was 1;

Food for Thought.

Could you post a link to a page with the charts?
Member Since: August 3, 2008 Posts: 15 Comments: 5722
465. BenBIogger 9:28 PM GMT on July 29, 2009    
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466. weathermanwannabe 9:29 PM GMT on July 29, 2009    
460. IKE 5:27 PM EDT on July 29, 2009

Good question, but, these stats include all the years (including the August starts as mentioned by Dr. M) in the period......If they used a different date (i.e. Aug 20th), then I suspect the average number would probably go down to about 6-7 storms.
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468. jeffs713 9:29 PM GMT on July 29, 2009    
Quoting SavannahStorm:
Watch as the dry, dusty ULL sucks up the wave's moisture like bathwater down the drain...


Not only that, but it started drying out all the moisture content too.
Member Since: August 3, 2008 Posts: 15 Comments: 5722
469. hurricanefiend85 9:30 PM GMT on July 29, 2009    
Quoting Patrap:
Okay my retentive ones..I replaced the map.

Im a lil off today as the Ol slipped disc required 6 Hours at the VA this day.
Thanks for the Taxes that also provided for my Health Care today.
Hope that covers this post..
LOL

Hey, hey, hey, excuse me but spinal cord injuries are no excuse for faulty graphics Patrap...however incontenince is an entire different matter all together....
Member Since: February 11, 2009 Posts: 0 Comments: 42
470. Patrap 9:31 PM GMT on July 29, 2009    
Hurricane data
collection stations up
Updated: Wednesday, 29 Jul 2009, 1:29 PM CDT
Published : Wednesday, 29 Jul 2009, 1:29 PM CDT



Liz Nelson
MOBILE, Ala. - The Center for Hurricane Intensity and Landfall Investigation, or CHILI, at the University of South Alabama will add 12 more stations for the collection of weather data throughout south Alabama before the end of the year.

This means CHILI will be able to collect weather data within minutes from a total of 26 station and provide it in real time to researchers, National Weather Service forecasters and the public through a new Web site. The data will also be used to improve hurricane landfall and intensity predictions to aid emergency responders and the public.
Member Since: July 3, 2005 Posts: 372 Comments: 111610
471. IKE 9:31 PM GMT on July 29, 2009    
Quoting weathermanwannabe:
460. IKE 5:27 PM EDT on July 29, 2009

Good question, but, these stats include all the years (including the August starts as mentioned by Dr. M) in the period......If they used a different date (i.e. Aug 20th), then I suspect the average number would probably go down to about 6-7 storms.


That sounds about right(6-7).
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473. weathermanwannabe 9:32 PM GMT on July 29, 2009    
http://www.srh.noaa.gov/images/tbw/TopNews/PDF/ClimatologyofHurricaneSeasonsWithaLateStart.pdf
Member Since: August 8, 2006 Posts: 0 Comments: 6703
474. jeffs713 9:33 PM GMT on July 29, 2009    
Quoting TexasHurricane:


ok, so it is looking more favorable then...?

I wouldn't say "favorable", just more "possible".
Member Since: August 3, 2008 Posts: 15 Comments: 5722
475. mikatnight 9:33 PM GMT on July 29, 2009    
Quoting CycloneOz:


Ruh...roh!

"buy you some pots!" is what I meant to say.


It was much funnier the first time.
Member Since: October 18, 2005 Posts: 0 Comments: 1983
476. popartpete 9:34 PM GMT on July 29, 2009    
OK Blog Buddies, I am not on the Jersey Shore, I'm in Central Florida. I drove here. The worst rainstorm I've ever seen, I drove through in Jacksonville at about 6 p.m. last night. Right now, I'm in Pasco County, and it's a close second. Thunderboomers are not in short supply this week!
OK, it's vacation, I'm thirsty, and happy hour awaits. God Bless!
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477. TexasHurricane 9:34 PM GMT on July 29, 2009    
Quoting jeffs713:

I wouldn't say "favorable", just more "possible".


ok
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478. Patrap 9:34 PM GMT on July 29, 2009    
Biloxi Lighthouse among five honored
Wednesday, July 29, 2009
Submitted by Beth Barnett


Five lighthouses that withstood the fury of devastating hurricanes in some cases while partially submerged will stand tall on postage with the issuance of the Gulf Coast Lighthouses commemorative stamps.

Available nationwide now, the 44-cent first-class stamps, issued in sheets of 20, depict the Matagorda Island, Texas; Sabine Pass, La.; Biloxi; Sand Island, Ala.; and Fort Jefferson, Fla., lighthouses.

The dedication ceremony took place at the Biloxi Lighthouse under conditions in stark contrast to 2005's Hurricane Katrina when a 26-foot storm surge engulfed Biloxi's treasured landmark, placing nearly half of the 64-ft. tall structure underwater.
Member Since: July 3, 2005 Posts: 372 Comments: 111610
480. jeffs713 9:35 PM GMT on July 29, 2009    
Quoting CycloneOz:


Hi Pat!

I'll be submitting enough money this weekend. It's not alot, but it will buy you some pot.
Quoting CycloneOz:


Ruh...roh!

"buy you some pots!" is what I meant to say.

LOL. Best "oops" on the blog. Congrats.
Member Since: August 3, 2008 Posts: 15 Comments: 5722
481. mobilegirl81 9:36 PM GMT on July 29, 2009    
Alright! Mobile, AL is recognized for something. Hopefully not another Frederic.
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482. BenBIogger 9:37 PM GMT on July 29, 2009    
Quoting btwntx08:

thats what u called d-min and that ull is not going suck up that moisture wave in front an enviornment and its gonna follow it just y'all see



???
Member Since: March 19, 2009 Posts: 0 Comments: 1419
483. jeffs713 9:37 PM GMT on July 29, 2009    
Quoting btwntx08:

thats what u called d-min and that ull is not going suck up that moisture wave in front an enviornment and its gonna follow it just y'all see

The drying out was over 2 days, though. The dmax cycle after the ULL started sucking up the moisture wasn't anything close to as significant as when the wave first rolled off. The moisture stream was also pinching off a little at the middle section, between the ULL and the wave itself.
Member Since: August 3, 2008 Posts: 15 Comments: 5722
484. Patrap 9:38 PM GMT on July 29, 2009    
Report blasts FEMA on storm trailer formaldehyde
By CAIN BURDEAU (AP) – 5 days ago



NEW ORLEANS — The Federal Emergency Management Agency took too long to respond to initial reports of dangerous levels of formaldehyde in trailers delivered to victims of the 2005 hurricanes, exposing people to possible health risks, a report of the Homeland Security Department inspector general said Thursday.

"FEMA did not display a degree of urgency in reacting to the reported formaldehyde problem," the report said, "a problem that could pose a significant health risk" to those living in the temporary housing.

The report marked a stinging reprimand of FEMA and its slow response to reports in 2006 that air in some trailers registered dangerously high levels of formaldehyde. Critics have said the chemical used in the manufacture of certain mobile homes and trailers can cause cancer and respiratory illnesses.

FEMA and its contractors shipped about 203,000 mobile homes, travel trailers and other models to victims of hurricanes Katrina and Rita, two of the worst storms in U.S. history. The hurricanes destroyed more than 300,000 homes in 2005 and displaced about 700,000 people.

The report said about one third of the units had "significant potential formaldehyde problems."
Member Since: July 3, 2005 Posts: 372 Comments: 111610
485. Cavin Rawlins 9:40 PM GMT on July 29, 2009    
Good afternoon all, I've been in Anguilla all day attending a workshop on the impact of Caribbean coral reefs, and just returned. It's really sad to see those bloggers who did love the tropics up until 2008 are so pessimistic about the season. I do agree that numbers will slightly go down this year, infact, most likely mines will go down by mid-August but the impatience seems to be killing alot of folks, lol. Well, we will get atleast 6 to track, most likey more and there's always the 2010 hurricane season. Just gotta hang in there. In the meantime, you can always read up, refresh you knowledge, ask questions, update your prepardness list and what's not. Who knows, maybe mother nature is buying us time. Remember all the years that ahd low ACE worldwide ended up with a retired cat 5. Don't become complacent.
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486. mobilegirl81 9:41 PM GMT on July 29, 2009    
What do they say? Survived Katrina, but destroyed by FEMA.
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487. popartpete 9:41 PM GMT on July 29, 2009    
Quoting CybrTeddy:


You mean Project Constellation right? Yea, I know. The Ares I and V are in serious trouble, it's starting to become possible to assume that the Ares I might be cancelled, same with the V. The Ares I-X launch has been delayed to October 31st 2009 and its possible it might not get off the ground till 2010. They might cancel them all together, and go with this.


or this

That design utilizes current STS engines and boosters. Both are dependable systems, time proven, and redesigned not to fail. Notice that the crew area is totally away from the rockets and fuel tank. Thank you Challenger. Also, there's no foam to shed on any heat shields, thank you Columbia, and to some extend Atlantis and Endeavour, also damaged by that damn foam, but not catastrophically. Let's see what happens. The U.S has to be able to achieve low earth orbit dependably, safely, and relatively cheaply to reach the ISS. Looks as if the orbiter is being replaced with a simpler design that will land like the old Apollo missions. The space program is neck and neck with my other passion, tropical weather!!
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488. weathermanwannabe 9:42 PM GMT on July 29, 2009    
As we head into the month of August this weekend we’re still waiting on the first named storm of the 2009 Hurricane Season. Only three times in the last 20 years have we seen this late of a start, and in the past 50 years it’s only happened about 30% of the time. Out of all of the hurricane seasons on record, an August start only happens 26% of the time. Believe it or not, there have been a handfull of seasons where the first tropical storm didn’t develop until after the first of September. The last time that happened was in 1941. There’s only about an 8% chance of that happening in any given year.

Some have asked, “If the season starts late, then there should be lower numbers of storms because there’s less time left in the season, right?” Well, the answer is “NO”. A little more than half of the seasons in the past 50 years that were off to an August start had above normal activity, averaging about 13 named storms. About the same number of seasons had above normal numbers of “Major” hurricanes meaning Category 3 or higher. Another thing that stuck out in the data was that out of the 7 late starting seasons that produced lower than normal activity, 4 of those had a Category 5! This would include Hurricane Andrew in 1992. 1992 produced only 7 named storms, but Andrew’s damage alone totalled about $35 Billion! That’s comparable to Hurricanes Charley, Ivan, and Jeanne combined in 2004. And costlier than Hurricanes Ike and Gustav in 2008. Only the record setting season of 2005 caused more financial damage to the United States thanks to Katrina, Rita, Wilma, and Dennis.

Written by Baker
July 29th, 2009 at 10:59 am
KATC Storm Team 3 Weather Blog
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489. BurnedAfterPosting 9:44 PM GMT on July 29, 2009    
Quoting weathermanwannabe:
As we head into the month of August this weekend we’re still waiting on the first named storm of the 2009 Hurricane Season. Only three times in the last 20 years have we seen this late of a start, and in the past 50 years it’s only happened about 30% of the time. Out of all of the hurricane seasons on record, an August start only happens 26% of the time. Believe it or not, there have been a handfull of seasons where the first tropical storm didn’t develop until after the first of September. The last time that happened was in 1941. There’s only about an 8% chance of that happening in any given year.

Some have asked, “If the season starts late, then there should be lower numbers of storms because there’s less time left in the season, right?” Well, the answer is “NO”. A little more than half of the seasons in the past 50 years that were off to an August start had above normal activity, averaging about 13 named storms. About the same number of seasons had above normal numbers of “Major” hurricanes meaning Category 3 or higher. Another thing that stuck out in the data was that out of the 7 late starting seasons that produced lower than normal activity, 4 of those had a Category 5! This would include Hurricane Andrew in 1992. 1992 produced only 7 named storms, but Andrew’s damage alone totalled about $35 Billion! That’s comparable to Hurricanes Charley, Ivan, and Jeanne combined in 2004. And costlier than Hurricanes Ike and Gustav in 2008. Only the record setting season of 2005 caused more financial damage to the United States thanks to Katrina, Rita, Wilma, and Dennis.

Written by Baker
July 29th, 2009 at 10:59 am
KATC Storm Team 3 Weather Blog


Really puts things in perspective, thanks for posting that.
490. popartpete 9:44 PM GMT on July 29, 2009    
Quoting popartpete:

That design utilizes current STS engines and boosters. Both are dependable systems, time proven, and redesigned not to fail. Notice that the crew area is totally away from the rockets and fuel tank. Thank you Challenger. Also, there's no foam to shed on any heat shields, thank you Columbia, and to some extent Atlantis and Endeavour, also damaged by that damn foam, but not catastrophically. Let's see what happens. The U.S has to be able to achieve low earth orbit dependably, safely, and relatively cheaply to reach the ISS. Looks as if the orbiter is being replaced with a simpler design that will land like the old Apollo missions. The space program is neck and neck with my other passion, tropical weather!!
Member Since: July 10, 2007 Posts: 0 Comments: 415
491. nyhurricaneboy 9:45 PM GMT on July 29, 2009    
Hello! We have had a rough day weatherwise in New York City; my house even had a power outage!

P.S. New blog contest:

Blog Contest
Member Since: August 19, 2008 Posts: 104 Comments: 503
492. docrod 9:46 PM GMT on July 29, 2009    
Well the nit-pickers must have been out in force today (and yes I too noted the omission ... and the technicalities)

"We can also add 1992 to the list if we ignore the unnamed subtropical storm that formed in April of that year. That year had the notorious Hurricane Andrew as its first named storm."- J Masters

And well they should, I'm glad Jeff amended the blog today because when it comes down to it, technically and by the letter of his blog entry, 1992 should be there. The north eyewall experience in Kendall, FL for me was a true educational experience I will never forget. I have no recollection of the April un-named system.

If I might do a bit of wish-casting right now, let's keep this one quiet. I'd love the break. - take care folks
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494. wunderkidcayman 9:47 PM GMT on July 29, 2009    
hi guys whats new in the tropics
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496. RufusBaker 9:49 PM GMT on July 29, 2009    
I think that if there are no stomrs out there, we should be able to talk about anything we want :-p
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497. Patrap 9:49 PM GMT on July 29, 2009    
Re: 494

Read the entry above or check the NHC discussion.. But in a single word..


Nuthing
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499. BahaHurican 9:50 PM GMT on July 29, 2009    
Quoting Drakoen:
I don't anticipate development over the next 2 weeks.
August 15th .
500. docrod 9:51 PM GMT on July 29, 2009    
Quoting StormW:
Good evening!


Good eve from first day of the special two day lobster sport season headquarters - crazy here
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501. weathermanwannabe 9:52 PM GMT on July 29, 2009    
More to talk over, and study, over the next few weeks as keep an eye on the models...Headin Home for some Chow....See Yall Tommorow.
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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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