Drip from radiator vent tube

[larryfleener]

Went outside to ride today and noticed a quarter sized spot of fluid under my 07 1600 Nomad. Upon further looking I found the source to be fluid leaking from the tube to the radiator. Has anyone had this happen and is it something serious? The bike has not been ridden for several days now but the temperatures here in Northern Ar. have been mild to cool all week. Any help on this would be appreciated. Thanks in advance.