By The Numbers: August 19, 2011

By: Neapolitan , 11:19 PM GMT on August 19, 2011

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  • With today's designation of TS Harvey, the 2011 North Atlantic Hurricane Season is off to a wild (in terms of number of storms) yet mild (in terms of Accumulated Cyclone Energy, or ACE). Climatologically-speaking--that is, from 1966 through 2009--we can expect the eighth named storm of the season on September 24. 2011 is, thus, five weeks ahead of schedule. However, also climatologically-speaking, the first hurricane from the aforementioned 1966-2009 period has appeared on August 10, so 2011 is a week and a half behind. As I said, both wild and mild.

    Storm Stairstep


  • 2005--the busiest hurricane season ever--saw the tenth storm of that season, Jose, named on August 22nd. As I write this on August 19th, there are two possible Jose candidates; if either is named in the next three days, 2011 will (obviously) be tied with 2005 in terms of named storms. However, all of 2011's storms to-date have been relative weaklings--and that takes us to my next point:


  • In 2005, the first seven named storms--Arlene through Irene--accumulated 61.85 ACE units, for a per-storm average of 8.78. By comparison, the first seven storms this year have averaged 1.79 ACE units, for a total of 12.5.


  • Speaking of per-storm ACE, here's this year's to-date tally ordered by ACE:
    BRET: 2.9450
    ARLENE: 1.9875
    EMILY: 1.9875
    CINDY: 1.8800
    DON: 1.7000
    GERT: 1.6025
    FRANKLIN: 0.4050
    HARVEY: 0.1600

    ACE contribution per storm


  • ACE distribution by day

  • A lot of people have been talking about how odd it is that none of 2011's storms to date have been able to make it to hurricane status. That's definitely remarkable. But of some note is the fact that every tropical depression this year has become a named storm. Over the past 16 seasons, that's only happened six times.



  • Thanks for stopping by, visitor free hit counters !

    --Neapolitan

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19. DaveFive
9:41 AM GMT on November 10, 2013
Hello Neapolitan, I'm Dave from San Jose, CA. Your blog info on the hurricanes is great. I like the photos. The weather in San Jose has been dry for quite some time.
Member Since: August 16, 2013 Posts: 9 Comments: 311
18. MisterPerfect
1:54 AM GMT on November 02, 2013
I miss your graphs. Sure wish you'd get back to the numbers one day. A mind is a terrible thing to waste. Publish something.
Member Since: November 1, 2006 Posts: 71 Comments: 20142
17. hurricanes2018
12:50 PM GMT on July 17, 2013
starting this weekend weakness in the ridge
Member Since: March 12, 2013 Posts: 149 Comments: 124672
16. hydrus
4:16 PM GMT on July 02, 2013
Greetings
Member Since: September 27, 2007 Posts: 1 Comments: 24766
15. GeorgiaStormz
4:23 PM GMT on September 18, 2012
Thanks
Member Since: February 11, 2012 Posts: 0 Comments: 9770
14. Some1Has2BtheRookie
6:44 PM GMT on December 24, 2011
I wish to thank each of you for your many splendid posts, knowledge, companionship and general great fun. The present I wish to give to us all is a Very Merry Christmas, Happy Holidays and may 2012 be the best year of your life. May we all remain safe, happy and well! .. I look forward to seeing each of you in the coming year. To my extended family, on this blog, all the best.

Merry Christmas, Jim!
Member Since: August 24, 2010 Posts: 0 Comments: 4942
12. RTLSNK
10:00 AM GMT on November 21, 2011
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11. RTLSNK
1:27 PM GMT on November 20, 2011
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10. RTLSNK
9:31 AM GMT on November 19, 2011
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9. RTLSNK
9:58 AM GMT on November 18, 2011
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8. RTLSNK
10:32 AM GMT on November 17, 2011
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7. tulsahurrcane
11:17 AM GMT on August 31, 2011
As always, appreciate your info and efforts
Member Since: August 15, 2010 Posts: 0 Comments: 129
6. Chicklit
12:23 AM GMT on August 20, 2011
The original charts are great.
Will be interesting to see how this season plays out as we compare it with 2005.
Thanks, Neap.
Member Since: July 11, 2006 Posts: 14 Comments: 11477
5. Some1Has2BtheRookie
12:16 AM GMT on August 20, 2011
Thank you, Nea. Looks like the rest of the season will be active in the terms of the strength of the storms. I would find it hard to fathom that we get 47 named storms with no majors. ;-)
Member Since: August 24, 2010 Posts: 0 Comments: 4942
4. WeatherNerdPR
12:16 AM GMT on August 20, 2011
Thanks a lot!
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3. TropicalAnalystwx13
12:13 AM GMT on August 20, 2011
Thanks for the information!
Member Since: July 6, 2010 Posts: 113 Comments: 34203
2. Patrap
11:34 PM GMT on August 19, 2011
TS Harvey Storm Relative 1km Geostationary Visible Imagery
Loop
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1. Patrap
11:32 PM GMT on August 19, 2011
TS Harvey



3 T-Storms Stepping
Member Since: July 3, 2005 Posts: 434 Comments: 133417

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About Neapolitan

A solid but breezy look at tropical and other extreme weather from a mathematical point of view. People may lie, but the numbers never do!

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