Never seen anything like that before. But my curiosity got the best of me so I looked it up. Plus, it's always a good thing to learn new stuff when you are a CFI.
610802 is an icing forecast. The forecast is for light icing from a height of 2,400m/8,000 ft. up to 3,000m/10,000 ft.
6= Icing group
1= Type of icing
080= Height above aerodrome
2= Thickness of layer
510008 is a turbulence forecast. The forecast is light turbulence from less than 30 meters up to 2,400m/8,000 ft.
5= Turbulence group
1= Light turbulence
000= Height above aerodrome
8= Thickness of layer
Here is the link where I found the info:
Hope that helps
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