Ofer-hragan

According to the Old English Dictionary:

ofer-hragan

to come in storms(?):--Wǽtum hé oferhrægeþ, gebryceþ burga geatu it (snow) comes in damp storms on cities' gates, and breaks them, Salm. Kmbl. 612; Sal. 305. [Cf. Icel. hragla to sleet; hregg a storm.] ofer-hragan