 Citizen science site Cyclone Center uses a modified version of the Dvorak technique to categorize post @-@ 1970 tropical weather . 
 Citizen science site Cyclone Center <a href='uninflect' title='1'><mark>uses</mark></a> a modified version of the Dvorak technique to categorize post @-@ 1970 tropical weather . 
Citizen science site Cyclone Center use a modified version of da Dvorak technique to categorize post @-@ 1970 tropical weather .