Rain and snow pass over Västmanland in the morning on Wednesday and then pull off east. The rain is followed by clear weather and falling temperatures, which creates the risk of ice slipping when wet roads freeze.
According to SMHI, the definition of a Class 1 warning for sudden ice slipping is that the weather conditions are those that cause ice slipping, for example, undercooled rain or rain on fast-freezing roadways. If the forecast changes to more severe sub-cold rain, the warning is updated to a higher warning class.