Heaney uses enjambment & caesura to fragment the poem in some places, and to build it to a crescendo in others. This creates an uneven rhythm, rather like the storm itself. The enjambment picks up the rhythm, which then hits an abrupt stop at each moment of caesura – granting power to hard monosyllabic words such as ‘blast’ and ‘lost.’ 'Which might prove company when it blows full/ Blast:'