 The Dvorak technique ( developed between 1969 and 1984 by Vernon Dvorak ) is a widely used system to estimate tropical cyclone intensity ( which includes tropical depression , tropical storm , and hurricane / typhoon / intense tropical cyclone intensities ) based solely on visible and infrared satellite images . Within the Dvorak satellite strength estimate for tropical cyclones , there are several visual patterns that a cyclone may take on which define the upper and lower bounds on its intensity . The primary patterns used are curved band pattern ( T1.0 @-@ T4.5 ) , shear pattern ( T1.5 @-@ T3.5 ) , central dense overcast ( CDO ) pattern ( T2.5 @-@ T5.0 ) , central cold cover ( CCC ) pattern , banding eye pattern ( T4.0 @-@ T4.5 ) , and eye pattern ( T4.5 - T8.0 ) . 
 The Dvorak technique ( developed between 1969 and 1984 by Vernon Dvorak ) <a href='drop_aux' title='1'><mark>is</mark></a>a widely used system to estimate tropical cyclone intensity ( which <a href='uninflect' title='2'><mark>includes</mark></a> tropical depression , tropical storm , and hurricane / typhoon / intense tropical cyclone intensities ) based solely on visible and infrared satellite images . Within the Dvorak satellite strength estimate for tropical cyclones , <a href='dey_it' title='3'><mark>there</mark></a> are several visual patterns <a href='null_relcl' title='4'><mark>that</mark></a>a cyclone may take on which define the upper and lower bounds on its intensity . The primary patterns used are curved band pattern ( T1.0 @-@ T4.5 ) , shear pattern ( T1.5 @-@ T3.5 ) , central dense overcast ( CDO ) pattern ( T2.5 @-@ T5.0 ) , central cold cover ( CCC ) pattern , banding eye pattern ( T4.0 @-@ T4.5 ) , and eye pattern ( T4.5 - T8.0 ) . 
Da Dvorak technique ( developed between 1969 and 1984 by Vernon Dvorak ) a widely used system to estimate tropical cyclone intensity ( which include tropical depression , tropical storm , and hurricane / typhoon / intense tropical cyclone intensities ) based solely on visible and infrared satellite images . Within the Dvorak satellite strength estimate for tropical cyclones , it is several visual patterns a cyclone may take on which define tdaupper and lower bounds on its intensity . The primary patterns used r curved band pattern ( T1.0 @-@ T4.5 ) , shear pattern ( T1.5 @-@ T3.5 ) , central dense overcast ( CDO ) pattern ( T2.5 @-@ T5.0 ) , central cold cover ( CCC ) pattern , banding eye pattern ( T4.0 @-@ T4.5 ) , and eye pattern ( T4.5 - T8.0 ) .