Over 20mm of rain has fallen in the last 12 hours, says Carlow forecaster Alan O'Reilly as he issued a flood warning.
According to www.carlowweather.com, heavy rain overnight is clearing most areas now with sleet/snow still falling in parts of Ulster.
Alan added: "With over 20mm falling in the last 12 hours the flooding situation will continue to worsen. Levels on the Shannon continue to rise.
"Mix of bright spells and showers [on Monday], turning cold from this evening with a cold week ahead an risk of wintry showers [on Tuesday]."