From the May 19, 1921 edition of the Skidmore News (Skidmore, Missouri), page 1:
Aurora Borealis Visible.
Electrical Disturbance Saturday Night Caused Wire Trouble.
An electrical phenomenon, said to be caused by the Aurora Borealis, or Northern Lights, which caused telegraph and telephone trouble at various points, was visible here Saturday night. The disturbance was seen and felt generally over the United States and other countries.
The local telephone switchboards, here as at other places in this section, were affected at intervals. Reports from various places where all night telegraph service is maintained state that the telegraph wires were out of order on account of the disturbance, and it is said to have caused the destruction by fire of the Central New England railway station at Brewster, N.Y.
Telegraph and telephone lines throughout the northern part of Europe were also disturbed. A telephone exchange at Karlsbad, Sweden, was destroyed by fire, supposedly caused by the disturbance.