I don't think the weather can help the WI as we saw in the last test match it didn't save them. England are in a strong position right now and I think we'll see England bowl them out for less then 200 and England will bat again and put it out of reach for the WI. Its a shame that the WI team can't handle the pressure which is what lets them down a lot of the time. After the first test match it was looking like it could be a good even series but that all changed and now its just one sided.
The West Indies are trailing by 232 runs and they have already lost 6 wickets, which means they have lost most of their prominent batsmen. I do not think it is possible for them to come back but the weather can still play its part.