water 'stays' on road when surface temperature is <0
when the forecast indicates rain immediately before forecast-start point, but not later, and the surface temperature is less the freezing point, the water 'stays' on road, and causes incorrect road-state (ie water/snow instead of just snow)
attaching a problematic set of files:
note the <ra>0.17</ra>
in roadcast from 1900Z to 0040Z white st<0 all the time