Dr. Jeff Masters' WunderBlog

Late-starting hurricane seasons
Posted by: Dr. Jeff Masters, 02:01 PM GMT del 29 Luglio 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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102. IKE 03:48 PM GMT del 29 Luglio 2009    
Member Since: Giugno 9, 2005 Posts: 23 Comments: 37044
103. melwerle 03:49 PM GMT del 29 Luglio 2009    
Gotta love it...living in San Diego, it's totally dry and I hear some idiot setting off fireworks somewhere.
Member Since: Giugno 28, 2006 Posts: 12 Comments: 1837
104. IKE 03:52 PM GMT del 29 Luglio 2009    
Quoting melwerle:
Gotta love it...living in San Diego, it's totally dry and I hear some idiot setting off fireworks somewhere.


Or guns.
Member Since: Giugno 9, 2005 Posts: 23 Comments: 37044
105. KEEPEROFTHEGATE (Mod) 03:52 PM GMT del 29 Luglio 2009    
Quoting melwerle:
Gotta love it...living in San Diego, it's totally dry and I hear some idiot setting off fireworks somewhere.
first ya hear the fireworks then ya will hear the firetrucks some people just don't get it
Member Since: Luglio 15, 2006 Posts: 144 Comments: 40651
106. BurnedAfterPosting 03:52 PM GMT del 29 Luglio 2009    
Ok lets be realistic, why does 1 storm really make a difference on here?

I showed several seasons last night that had only 1 named storm going into mid-August and were above average. 1955, 1984, 1999

I mean really we all know the way this blog works that if we had 1 named storm early and then nothing formed until August, people would call the season a bust anyway, so why bother debating with them lol
107. BurnedAfterPosting 03:53 PM GMT del 29 Luglio 2009    
People who feel this season is a bust already are the same ones that love seasons like last year and 2005, seasons that have their activity spread out over the whole season so we always have something to track

If it goes quiet for a month or two they get antsy.
108. hurricanejunky 03:53 PM GMT del 29 Luglio 2009    
Quoting melwerle:
Gotta love it...living in San Diego, it's totally dry and I hear some idiot setting off fireworks somewhere.


UGH! That's gotta make your stomach turn after some of the horrible fires you guys have had out there. I hate seeing those because out those thing are CRAZY. Here in Florida we just get a ton of small ones instead of a couple of huge ones. Be safe!

Member Since: Agosto 28, 2006 Posts: 6 Comments: 2875
109. KEEPEROFTHEGATE (Mod) 03:56 PM GMT del 29 Luglio 2009    
the season is far from a bust we got aug sept and part of oct to go now at the mid oct period we still don't have anything which is unlikly then ya can call the season a bust till then we wait watch and see

by the way don't anyone start throwing away hurricane supplies just yet
Member Since: Luglio 15, 2006 Posts: 144 Comments: 40651
110. PensacolaDoug 03:57 PM GMT del 29 Luglio 2009    
Quoting IKE:
jeff713....I posted this yesterday afternoon from the afternoon San Juan,PR discussion...

"LATEST MJO PROGNOSIS FROM THE CPC WEB SITE CONTINUES TO INDICATE
STRONG DOWNWARD MOTION ACROSS THE ENTIRE ATLC BASIN THROUGH THE
MIDDLE OF AUGUST. SO IT APPEARS THE HURRICANE SEASON WILL CONTINUE
TO BE PUT ON HOLD.".......





THE LATEST MJO PROGNOSIS
LEADS TO THE FOLLOWING DIAGNOSIS
STRONG DOWNWARD MOTION
ACROSS THE ENTIRE ATLANTIC OCEAN
WILL DRIVE THIS ENTIRE BLOG INTO PSYCHOSIS
Member Since: Luglio 25, 2006 Posts: 0 Comments: 4828
111. rwdobson 03:57 PM GMT del 29 Luglio 2009    
Part of the problem is the notion of "hurricane season" which "starts" in june...which to me is sort of like saying 'snow season' starts in october. sure, it's possible that it can snow in october in a lot of places, but it's rare. the 'season' for snows in the US really starts in december.

same for hurricanes. to me, hurricane season doesn't even really start until august. if we get to august 31 and we still haven't had a named storm, then i'll think it's a slow season.
Member Since: Giugno 12, 2002 Posts: 0 Comments: 1574
112. BurnedAfterPosting 03:57 PM GMT del 29 Luglio 2009    
Quoting KEEPEROFTHEGATE:
the season is far from a bust we got aug sept and part of oct to go now at the mid oct period we still don't have anything which is unlikly then ya can call the season a bust till then we wait watch and see

by the way don't anyone start throwing away hurricane supplies just yet


Well said, but people will do it regardless, so I am just going to try and ignore them lol

below average season is one thing, a bust is something completely different.
113. PensacolaDoug 04:00 PM GMT del 29 Luglio 2009    
Quoting rwdobson:
Part of the problem is the notion of "hurricane season" which "starts" in june...which to me is sort of like saying 'snow season' starts in october. sure, it's possible that it can snow in october in a lot of places, but it's rare. the 'season' for snows in the US really starts in december.

same for hurricanes. to me, hurricane season doesn't even really start until august. if we get to august 31 and we still haven't had a named storm, then i'll think it's a slow season.




Good point.
Member Since: Luglio 25, 2006 Posts: 0 Comments: 4828
114. catastropheadjuster 04:01 PM GMT del 29 Luglio 2009    
Quoting IKE:


Hey Ike, How are ya? Listen I was just wondering on the image you put up, what is the squiggly yellow line? I am just trying to understand.

Sheri
Member Since: Agosto 24, 2006 Posts: 21 Comments: 3556
115. melwerle 04:01 PM GMT del 29 Luglio 2009    
Pretty dumb really...the mountains are in view from my house and you can still see all the burns on them from the last fire. Folks don't get it.
Member Since: Giugno 28, 2006 Posts: 12 Comments: 1837
120. PensacolaDoug 04:05 PM GMT del 29 Luglio 2009    
Aw shucks...It twernt nutin'....
Member Since: Luglio 25, 2006 Posts: 0 Comments: 4828
121. BurnedAfterPosting 04:06 PM GMT del 29 Luglio 2009    
Even if we were to get 6 named storms, whose to say where they will hit and what strength they will be?

6 storms but say 4 of them hit land and 3 of those are majors, is still a pretty bad season I would say

Numbers mean nothing, too many look at the numbers and assume all those storms will not have impacts.
122. IKE 04:07 PM GMT del 29 Luglio 2009    
Quoting catastropheadjuster:


Hey Ike, How are ya? Listen I was just wondering on the image you put up, what is the squiggly yellow line? I am just trying to understand.

Sheri


"Shown below are MJO forecast products using information from the ensemble GFS.".....

Ensemble GFS showing where the MJO is headed through Aug. 10th........
Member Since: Giugno 9, 2005 Posts: 23 Comments: 37044
124. LariAnn 04:09 PM GMT del 29 Luglio 2009    
Of course, the year we got hit with Andrew, he was the first named storm of the season, and was almost at the end of August when he arrived. One storm is no picnic if it is a Cat 5 storm (at least for whoever gets hit with it)!
Member Since: Settembre 13, 2007 Posts: 1 Comments: 16
125. jeffs713 04:10 PM GMT del 29 Luglio 2009    
For all those calling the season a bust:

It's not a bust, you just set your expectations too high. A season can't bust out of the gates every year like 2005 or 2008.
Member Since: Agosto 3, 2008 Posts: 15 Comments: 5722
126. IKE 04:11 PM GMT del 29 Luglio 2009    
MJO doesn't really come back in the Atlantic until the end of August....that's a month away...maybe it'll come true....

Member Since: Giugno 9, 2005 Posts: 23 Comments: 37044
127. catastropheadjuster 04:12 PM GMT del 29 Luglio 2009    
Quoting IKE:


"Shown below are MJO forecast products using information from the ensemble GFS.".....

Ensemble GFS showing where the MJO is headed through Aug. 10th........


Thanks for the answer Ike. Have a good day.
Member Since: Agosto 24, 2006 Posts: 21 Comments: 3556
128. stormsurge39 04:12 PM GMT del 29 Luglio 2009    
69% of hurricane seasons that start after Aug 1st have a major land falling hurricane in the usa and carrib. Dont let your guard down!!
129. IKE 04:13 PM GMT del 29 Luglio 2009    
Quoting catastropheadjuster:


Thanks for the answer Ike. Have a good day.


You too. I've had almost a foot...that's right, a foot of rain this month.
Member Since: Giugno 9, 2005 Posts: 23 Comments: 37044
130. PensacolaDoug 04:13 PM GMT del 29 Luglio 2009    
Question: Does the Doc do crow? (like the rest of us)



The tropics are in no condition,
to support hardly anyones prediction
we'll be feasting for sho'
on plenty of crow
that was cooked up in ol' Patraps Kitchen!
Member Since: Luglio 25, 2006 Posts: 0 Comments: 4828
131. PensacolaDoug 04:14 PM GMT del 29 Luglio 2009    
Ok i'm thru...

:)
Member Since: Luglio 25, 2006 Posts: 0 Comments: 4828
132. BurnedAfterPosting 04:14 PM GMT del 29 Luglio 2009    
We had an downward MJO all month for July and still had plenty of convection a week or two ago

Downward MJO can be overcome by stronger tropical waves.

One thing I have always heard about the MJO is that an upward motion can certainly help development; even spark it. A downward motion doesnt guarantee their wont be a named storm.
133. stormsurge39 04:17 PM GMT del 29 Luglio 2009    
There is too much African dust wrapping into these current waves for developement. there is also south westerly shear that they have to deal with. Give it a couple of weeks.
134. BurnedAfterPosting 04:18 PM GMT del 29 Luglio 2009    
Quoting stormsurge39:
There is too much African dust wrapping into these current waves for developement. there is also south westerly shear that they have to deal with. Give it a couple of weeks.


There is no dust off Africa for a couple hundred miles, The next few waves may have a shot
135. BenBIogger 04:18 PM GMT del 29 Luglio 2009    
Quoting stormsurge39:
There is too much African dust wrapping into these current waves for developement. there is also south westerly shear that they have to deal with. Give it a couple of weeks.


agree
Member Since: Marzo 19, 2009 Posts: 0 Comments: 1419
137. BurnedAfterPosting 04:19 PM GMT del 29 Luglio 2009    


SAL map
138. PensacolaDoug 04:19 PM GMT del 29 Luglio 2009    
Quoting BurnedAfterPosting:
We had an downward MJO all month for July and still had plenty of convection a week or two ago

Downward MJO can be overcome by stronger tropical waves.

One thing I have always heard about the MJO is that an upward motion can certainly help development; even spark it. A downward motion doesnt guarantee their wont be a named storm.




Joe B. Always refers to it as "The hammer and sycle (sp?)of subsidence. Or the "Sword of Damocles.... However ya spell it...
Member Since: Luglio 25, 2006 Posts: 0 Comments: 4828
139. outofdablue 04:19 PM GMT del 29 Luglio 2009    
Some say this hurricaine seasons a bust,
In all respects whom shall we trust?
Would my eyes be a lying
That swirl is she trying?
and what about all of that dust?
Are the sea turtles nesting?
On Our shores be investing their trust that our shores be there fort?
It was 79 I remember the time:
High school that year had ended to adulthood I was assending. I thought everything was just fine.
But September came and pressure went low and my old uncle said we all got to go! So to Foley we ran, cause that was the plan, we didnt know then what we know!
I remember it well, the terror, the hell.
The pine trees they snapped, the roof would it last? For another I'll not be a staying!
When in 04 Ivan came to our shores. By then I had moved 20 miles inland. But with 79 in my mind, our windows were boarded our jeep it was loaded and to Birmingham we ran with our clan.
When we had returned, I thank God I had learned. $56,000 damage to a brick house is amazing. When the twister hit, the roof it did split and we all stood there mouths were agaping.
Next time I will listen when NWS is insisting that they think it is time I will go!
Long time lurker...
First time poster
Kelly
Member Since: Luglio 29, 2009 Posts: 0 Comments: 47
141. PensacolaDoug 04:23 PM GMT del 29 Luglio 2009    
Hi Kelly! GOod Post!




You're next Lucy R.
Member Since: Luglio 25, 2006 Posts: 0 Comments: 4828
143. marknmelb 04:24 PM GMT del 29 Luglio 2009    
Let's here it for as BUST season. I'd love nothing more than to have a ZERO storm season. Zero storms means no damage to repair, no missed work, and no missed school dates for teh kids. Zero storms sounds like a perfect summer to me.
Member Since: Luglio 17, 2006 Posts: 0 Comments: 392
144. IKE 04:24 PM GMT del 29 Luglio 2009    
Quoting WeatherStudent:


Indeed it does, Ike. In a rather significant way. That'll be right around the climatological peak of the season as well. That could all lead to an explosively, severely active September, couldn't it? Tropically speaking that is. :)


It could...assuming the models are correct.
Member Since: Giugno 9, 2005 Posts: 23 Comments: 37044
145. mobilegirl81 04:24 PM GMT del 29 Luglio 2009    
Maybe a 2004 set up with not as many storms.
Member Since: Agosto 31, 2008 Posts: 0 Comments: 833
146. IKE 04:27 PM GMT del 29 Luglio 2009    
Quoting marknmelb:
Let's here it for as BUST season. I'd love nothing more than to have a ZERO storm season. Zero storms means no damage to repair, no missed work, and no missed school dates for teh kids. Zero storms sounds like a perfect summer to me.


I'll 2nd that. I'm rooting for it.
Member Since: Giugno 9, 2005 Posts: 23 Comments: 37044
147. Drakoen 04:26 PM GMT del 29 Luglio 2009    
Poems are getting so annoying...
Member Since: Ottobre 28, 2006 Posts: 57 Comments: 29010
150. marknmelb 04:28 PM GMT del 29 Luglio 2009    
Quoting mobilegirl81:
Maybe a 2004 set up with not as many storms.


yea, how a bout just four storms, a Charley, a Francis, a Jeanne, and an Ivan. That would be just lovely ... NOT !!!!
Member Since: Luglio 17, 2006 Posts: 0 Comments: 392
151. KEEPEROFTHEGATE (Mod) 04:29 PM GMT del 29 Luglio 2009    
Quoting IKE:


You too. I've had almost a foot...that's right, a foot of rain this month.
since april 6 09 to jul 29 09 my PWS has recorded 802.3 mm of rain wet is the least i can say
Member Since: Luglio 15, 2006 Posts: 144 Comments: 40651

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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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