no it isn't, you have to hit 2 blizzards over 2 turns. You add the accuracy and divide by the number of turns. 140/2= 70%Doesn't count because you have to hit two blizzards and the cumulative chance of that is less than 70% (look in the first post).
"7. Moves with at least 70% accuracy over the number of turns needed will always count as hitting."