 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 ) , banding eye pattern ( T4.0 @-@ T4.5 ) , eye pattern ( T4.5 - T8.0 ) , and central cold cover ( CCC ) pattern . Both the central dense overcast and embedded eye pattern utilize the size of the CDO . The CDO pattern intensities start at T2.5 , equivalent to minimal tropical storm intensity ( 40 miles per hour ( 64 km / h ) ) . The shape of the central dense overcast is also considered . The farther the center is tucked into the CDO , the stronger it is deemed . Tropical cyclones with maximum sustained winds between 65 miles per hour ( 105 km / h ) and 100 miles per hour ( 160 km / h ) can have their center of circulations obscured by cloudiness within visible and infrared satellite imagery , which makes diagnosis of their intensity a challenge . 
 Within the Dvorak satellite strength estimate for tropical cyclones , <a href='dey_it' title='1'><mark>there</mark></a> are several visual patterns <a href='null_relcl' title='2'><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 ) , banding eye pattern ( T4.0 @-@ T4.5 ) , eye pattern ( T4.5 - T8.0 ) , and central cold cover ( CCC ) pattern . Both the central dense overcast and embedded eye pattern utilize the size of the CDO . The CDO pattern intensities start at T2.5 , equivalent to minimal tropical storm intensity ( 40 miles per hour ( 64 km / h ) ) . The shape of the central dense overcast is also considered . The farther the center is tucked into the CDO , the stronger it is deemed . Tropical cyclones with maximum sustained winds between 65 miles per hour ( 105 km / h ) and 100 miles per hour ( 160 km / h ) can have their center of circulations obscured by cloudiness within visible and infrared satellite imagery , which <a href='uninflect' title='3'><mark>makes</mark></a> diagnosis of their intensity a challenge . 
Within the Dvorak satellite strength estimate for tropical cyclones , it is several visual patterns 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 ) , banding eye pattern ( T4.0 @-@ T4.5 ) , eye pattern ( T4.5 - T8.0 ) , and central cold cover ( CCC ) pattern . Both da central dense overcast and embedded eye pattern utilize the size of the CDO . TdaCDO pattern intensities start at T2.5 , equivalent to minimal tropical storm intensity ( 40 miles per hr ( 64 km / h ) ) . Thdahape of the central dense overcast is also considered . Thedarther the center is tucked into the CDO , the stronger it is deemed . Tropical cyclones w maximum sustained winds between 65 miles per hour ( 105 km / h ) and 100 miles per hohr 160 km / h ) can have their center of circulations obscured by cloudiness within visible and infrared satellite imagery , which make diagnosis of their intensity a challenge .