Drier weather and a few more barges, please. Those are the prayers managers of Lewiston’s two new grain elevators at the Port of Lewiston have been sending up this week through dripping, overcast skies. Between the two of them, they have more than 1.3-million bushels of wheat stored on the ground in three piles. At $4 a bushel, that represents more than $5 million. Some of it is sprouting around the edges near the ground. And only one barge is in sight — a big one due here for Coast Trading Co. Thursday.