Skip Navigation Link



 

 



SPECIAL MESSAGE:

On Tuesday December 6, 2016 at 11 a.m. EST (1500 UTC), a planned web system upgrade was performed. Due to this update we are experincing brief delays of data on the SSD web pages. We are aware of this problem and are working to correct it. For additional information see SATS message page.

Dvorak Current Intensity Chart


 

  CI        MWS         MWS         MSLP           MSLP          Saffir-Simpson   
Number    (Knots)      (MPH)     (Atlantic)    (NW Pacific)         Category     
 1         25 KTS      29 MPH                                     (Approximate)
 1.5       25 KTS      29 MPH      
 2         30 KTS      35 MPH      1009 mb        1000 mb
 2.5       35 KTS      40 MPH      1005 mb         997 mb
 3         45 KTS      52 MPH      1000 mb         991 mb
 3.5       55 KTS      63 MPH       994 mb         984 mb
 4         65 KTS      75 MPH       987 mb         976 mb        1  (64-83 KTS)
 4.5       77 KTS      89 MPH       979 mb         966 mb        1  (64-83 KTS); 2  (84-96 KTS)
 5         90 KTS     104 MPH       970 mb         954 mb        2  (84-96 KTS); 3  (97-113 KTS)
 5.5      102 KTS     117 MPH       960 mb         941 mb        3  (97-113 KTS)
 6        115 KTS     132 MPH       948 mb         927 mb        4  (114-135 KTS)
 6.5      127 KTS     146 MPH       935 mb         914 mb        4  (114-135 KTS)
 7        140 KTS     161 MPH       921 mb         898 mb        5  (136+  KTS)
 7.5      155 KTS     178 MPH       906 mb         879 mb        5  (136+  KTS)
 8        170 KTS     196 MPH       890 mb         858 mb        5  (136+  KTS)


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

More Information about the Saffir-Simpson Hurricane Categories