Long range forcast for me is looking out the window and seeing what is going on. Spring time is so unpredictable that the only thing I count on is that eventually it gets light and dark but in differing shades.
The Northern Oscillation over the Atlantic Ocean is headed into it's third year and weakening. The oscillation has a typical cycle of 3 years. It is this oscillation that was responsible for the non-stop rainfall from October 2003 until recently. This spring and summer should be what a person would consider normal.
Gary, your 3 days of rain is typical for March/April at this time of year. Don't sweat it.