"Mae rhybudd coch wedi ei gyhoeddi ar gyfer rhan helaeth o dde Cymru o 07.00 yfory, sy'n golygu bod perygl i fywyd.
“A red warning has been issued for much of south Wales from 07.00 tomorrow, which means there is a danger to life. Amber warnings will be in place from early Friday morning for the rest of the country.