The warning applies from Saturday to Sunday in small unregulated watercourses, in the Rautasälven and in the upper parts of the Kaitumälven.
There may be high class 2 flows in some places - which can cause problems with accessibility on hiking trails.
The rain area that passes east over Norrland on Saturday can give larger amounts of rain, especially in the east, but in the evening it is expected to slow down, reports SVT Väder.