E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Whenever Skiddaw hath a cap, Scruffell wots full well of that. When my neighbours house is on fire mine is threatened; When you are in misfortune I also am a sufferer; When you mourn I have cause also to lament. Skiddaw and Scruffell are two neighbouring hillsone in Cumberland and the other in Annandale in Scotland. When Skiddaw is capped with clouds, it will be sure to rain ere long at Scruffell. (Fuller: Worthies.)