Ar 27 Hydref, 1913, profodd dde Cymru gorwynt a ddisgrifiwyd yn 'unusually destructive'. Dyma sut y disgrifiodd Prifathro Ysgol Bechgyn Hŷn y corwynt ar gyfer Adroddiad Meteorolegol swyddogol ym 1914:

"At 5:15PM a dead calm set in... it was a 'troubled sky'. Rain began to fall at 5:20PM... The rain ceased in about 10 minutes... at 5:50PM we heard a noise resembling the hissing of an express locomotive... the panes of our window were broken by stones, tiles, slates, dried cement and splintered timber... after the crashing had ceased... rain fell in torrents. The lighting set fire to the tar which had been sprayed some three weeks previously on the main Cardiff to Merthyr road."

Er mai byr oedd y storm, fe achosodd ddifrod helaeth yn yr ardal. Cyrhaeddodd y storm ei huchafbwynt yn Edwardsville: dinistriwyd tai a ffenestri, chwythwyd cerrig beddi i'r llawr a diwreiddiwyd coed. Cafodd dyn a bachgen bach eu lladd. Roedd yn brofiad brawychus i bawb a oedd yn gysylltiedig.