understanding the weather maps

[erich weaver]

A"12-hour fronts/precipitation" map is presented on Weathermeister that comes from NOAA. What do the bright green lines mean ? Cant seem to find a legend for the map that explains it. Sometimes an area is enclosed with a bright green line and the enclosed area has a dashed cross-hatch pattern that Im assuming means rain, but other times the line does not enclose an area and there is no cross-hatch. Not sure what that means.

Can someone help me out?

thanks
erich

[rocketbob]

http://www.hpc.ncep.noaa.gov/html/pcpnsymbs2.shtml