Leaky windshield glass/roof

Hi,

When ever it raining heavely say for 2 to 3 hours water start to drip from the top near the glass and roof board joint on the front passengers side.

When I take a pale of water and pour it does not leak at all it happens only when it rains heavely.

I am really getting annoyed as it makes it very damp inside and my 8 month old baby starts to cry.

pls help me trace the source so that i can plug the hole/gap or what ever it is .

Regards
Rahul

The sealer around the windsheld has probably worn out. I'm sure any glass shop can reseal it for a decent price.