Heavy rain in California could lead to emptier salad plates this year. Two months of precipitation this winter have threatened almond, celery, strawberry and other crops in the Salinas Valley, the latest in a string of increasingly erratic weather events to hurt farmers. Farmers say the record rains could damage and delay some crops, leading to shortages and higher prices. The Salinas Valley produces most of the leafy greens for the U.S. during this stretch of the season until cooler areas supplement supply, and some grocers say the winter conditions have forced them to brace for disruptions in supply.