To attain his home,
But ensorcelling powers
Have contorted space,
Odded the way:
Instead of a facile
Five-minute trot,
Far must he hirple,
Clumsied by cold,
Buffeted often
By blouts of hail
Or pirries of rain,
On stolchy paths
Over glunch clouds,
Where infrequent shepherds,
Sloomy of face,
Snudge of spirit,
Glunch  is a  Scots  word meaning “frowning” or “sulky” or “sullen”. He is therefore personifying the clouds, seeing them as malevolent and powerful presences, hindering his homewards trek. It is interesting that he is traipsing  over  clouds, rather than the clouds being above him, which seems to imply either that he is wading through low-lying fog or that he is high in the hills, both of which possibilities suggest a harsh and inhospitable wilderness. 
 Note, more widely, how this stanza uses archaic Anglo-Saxon and earthy Northern English and Scottish dialect words to evoke a foreign land ruled by its magical landscape (whereas, upon waking from the dream in the second stanza, he slips back into the Latinate diction of literary life).
A Bad Night