Leak through rear hatch

I have recently been noticing that whenever it rains or when I go through a carwash there will be water everywhere. After tracing the source I realized that it was getting above my weatherstripping and leaking through, what I dont understand is why it would be getting through when it appears to be sealed very well. Is there something I could do for a quick fix or should I get new weatherstripping? Heres a pic of the weatherstripping, it looks ok.
http://i48.photobucket.com/albums/f236/manwiththeplan88/DSCF0922.jpg

i would try some silicone sealant like the stuff u use for bathtubs you can get it black and put some right were the striping meets the body. Autozone should have some.

http://max.thegamevoice.com/DSCF0922.jpg

Thanks for the advice, sounds like a good suggestion. I will be sure to do that right away .

What year is that?

looks like anywere from 98 to 03 , i have a 2001 blazer lt 4x4 and the rear from what i can see looks the same.

What year is that?
I'd guess that it's a 97.

Its a 1997.

dang i was off :)