Dvorak Numbers and explanations

[seahawkjd]

Code: Select all

CI        MWS         MSLP           MSLP          Saffir-Simpson   
Number    (Knots)    (Atlantic)    (NW Pacific)         Category     
 1         25 KTS                                     (Approximate)
 1.5       25 KTS
 2         30 KTS      1009 mb        1000 mb
 2.5       35 KTS      1005 mb         997 mb
 3         45 KTS      1000 mb         991 mb
 3.5       55 KTS       994 mb         984 mb
 4         65 KTS       987 mb         976 mb        1  (64-83 KTS)
 4.5       77 KTS       979 mb         966 mb        1  (64-83 KTS); 2  (84-96 KTS)
 5         90 KTS       970 mb         954 mb        2  (84-96 KTS); 3  (97-113 KTS)
 5.5      102 KTS       960 mb         941 mb        3  (97-113 KTS)
 6        115 KTS       948 mb         927 mb        4  (114-135 KTS)
 6.5      127 KTS       935 mb         914 mb        4  (114-135 KTS)
 7        140 KTS       921 mb         898 mb        5  (136+  KTS)
 7.5      155 KTS       906 mb         879 mb        5  (136+  KTS)
 8        170 KTS       890 mb         858 mb        5  (136+  KTS)

CI   -- Current Intensity
MWS  -- Mean Wind Speed
MSLP -- Mean Sea Level Atmospheric Pressure in Millibars

[mf_dolphin]

Glad to help

[seahawkjd]

Thanks I can never remember those things lol.

[charleston_hugo_veteran]

TY....It's a great reference!

[btsgmdad]

Thanks for the guide, had wondered what these things meant.

[soonertwister]

It would be nice to see how those numbers relate to the Saffir-Simpson scale, but I guess I'm just being picky.

It's doubtful that people will benchmark this thread regarding the intensity numbers, but people can always find the current ones here:

http://www.ssd.noaa.gov/PS/TROP/positions.html

At the bottom of the page, there is a link where you can get an idea of the relationship between the dvorak intensity numbers and actual hurricane intensity. 6.0 is quite intense, and 6.5 is a possible category 5 hurricane, a massively powerful system.

[mf_dolphin]

the Saffir Simpson scale numbers are on the right of the chart above

[Anonymous]

What if it was used on dvorak like Hurricane of 1935 or Camille>>>>

[mf_dolphin]

That would be hard for the 1935 cane since Dvorak needs a satellite image to interpret

[wjs3]

Thanks for the post--and thanks especially for the link to the T numbers for current tropical cyclones. I understood T numbers well, but was having a hard time finding T numbers on the internet.

Appreciate it!

[Benlanka]

It's doubtful that people will benchmark this thread regarding the intensity numbers, but people can always find the current ones here:

http://www.ssd.noaa.gov/PS/TROP/positions.html

Those are only the SAB T-numbers. You can find T-numbers from all suppliers (TAFB, SAB and AFWA/KGWC) right here along with already-determined intensity and pressure using the posted table above.