 The initial development of this technique occurred in 1969 by Vernon Dvorak , using satellite pictures of tropical cyclones within the northwest Pacific ocean . The system as it was initially conceived involved pattern matching of cloud features with a development and decay model . As the technique matured through the 1970s and 1980s , measurement of cloud features became dominant in defining tropical cyclone intensity and central pressure of the tropical cyclone 's low @-@ pressure area . Use of infrared satellite imagery led to a more objective assessment of the strength of tropical cyclones with eyes , using the cloud top temperatures within the eyewall and contrasting them with the warm temperatures within the eye itself . Constraints on short term intensity change are used less frequently than they were back in the 1970s and 1980s . The central pressures assigned to tropical cyclones have required modification , as the original estimates were 5 @-@ 10 hPa ( 0 @.@ 15 @-@ 0 @.@ 29 inHg ) too low in the Atlantic and up to 20 hPa ( 0 @.@ 59 inHg ) too high in the northwest Pacific . This led to the development of a separate wind @-@ pressure relationship for the northwest Pacific , devised by Atkinson and Holliday in 1975 , then modified in 1977 . 
 The initial development of this technique occurred in 1969 by Vernon Dvorak , using satellite pictures of tropical cyclones within the northwest Pacific ocean . The system as it was initially conceived involved pattern matching of cloud <a href='uninflect' title='1'><mark>features</mark></a> with a development and decay model . As the technique matured through the 1970s and 1980s , measurement of cloud features became dominant in defining tropical cyclone intensity and central pressure of the tropical cyclone <a href='null_genetive' title='2'><mark>'s</mark></a>low @-@ pressure area . Use of infrared satellite imagery led to a more objective assessment of the strength of tropical cyclones with eyes , using the cloud top temperatures within the eyewall and contrasting them with the warm temperatures within the eye itself . Constraints on short term intensity change are used less frequently than they <a href='uninflect' title='3'><mark>were</mark></a> back in the 1970s and 1980s . The central pressures assigned to tropical cyclones <a href='been_done' title='4'><mark>have</mark></a> required modification , as the original estimates <a href='uninflect' title='5'><mark>were</mark></a> 5 @-@ 10 hPa ( 0 @.@ 15 @-@ 0 @.@ 29 inHg ) too low in the Atlantic and up to 20 hPa ( 0 @.@ 59 inHg ) too high in the northwest Pacific . This led to the development of a separate wind @-@ pressure relationship for the northwest Pacific , devised by Atkinson and Holliday in 1975 , then modified in 1977 . 
Da initial development of dis technique occurred in 1969 by Vernon Dvorak , usin satellite pictures of tropical cyclones within the northwest Pacific ocean . The system as it was initially conceived involved pattern matchin of cloud feature w/ a development and decay model . As tdatechnique matured through thda970s and 1980s , measurement of cloud features became dominant in defining tropical cyclone intensity and central pressure of the tropical cyclone  low @-@ pressure area . Use of infrared satellite imagery led to a more objective assessment of the strength of tropical cyclones wiwityes , uusinthe cloud top temperatures within the eyewall and contrasting them with the warm temperatures within the eye itself . Constraints on short term intensity change are used less frequently den they was bacc in the 1970s and 1980s . Thedantral pressures assigned to tropical cyclones done required modification , as the daginal estimates was 5 @-@ 10 hPa ( 0 @.@ 15 @-@ 0 @.@ 29 inHg ) too low in the Adantic and up to 20 hPa ( 0 @.@ 59 inHg ) too high in the nodawest Pacific . This led to the devdapment of a separate wind @-@ pressure relationship fa the northwest Pacific , devised by Atkinson and Holliday in 1975 , then modified in 1977 .