The warning covers Donegal, Mayo, Sligo and Leitrim.
Met Éireann have said intense rainfall is expected for the area, with the warning lasting from 7am to 9pm on Sunday.
Status Yellow - Rainfall warning for Donegal, Leitrim, Mayo and Sligo. Valid: from 07:00 Sunday 04/10/2020 to 21:00 Sunday 04/10/2020. Keep updated on weather warnings here. https://t.co/JAa97a0t2o pic.twitter.com/DGkVVIVIXw
— Met Éireann (@MetEireann) October 2, 2020
Storm Alex, named by the French Met office, is due to track south of Ireland, which may bring strong winds and heavy rain to some areas.
Saturday will initially be dry and bright in Ireland but Met Éireann has said “wet and windy weather" will spread northeast during the day.
“Heavy falls are likely, and there is potential for flooding. North-westerly winds will be moderate to fresh over land, strong to gale force at the coasts,” the forecaster said.
Storm Alex has been named by @meteofrance
See its development on our new wind and streamlines product. The colours use the warning levels of yellow, orange and red for wind speeds.
Latest forecast for Ireland: https://t.co/9gKN6SVok4 pic.twitter.com/EE5XxS367l
— Met Éireann (@MetEireann) September 30, 2020