On Friday, May 10th the World Board (WAOB) will publish the first corn and soybean balance sheets for the 2019/2020 crop year. Based on the weather model employed by the USDA, I estimate the initial USDA yield for corn will be around 173 bushels per acre, 3 bushels per acre (bpa) below the trendline yield of 176. The model calls for a reduction of around 2.89 bpa for every 10% the US planting progress lags the average on 5/15. The average planting pace for May 15th in their model is near 80%. Some interpolation/extrapolation will be required. Our analog year is 2013. Planting progress went from 28 to 71% complete from May 12th to the 19th. The corn yield in the May 2013 WASDE was 158, 5.6 bpa below the trendline of 163.6 published at the 2013 USDA Forum. The Westcott‐Jewison model is used for guidance on WASDE yields for May – August reports. The surveyed yields will not begin until September this year. The yield adjustment will likely keep USDA 19/20 corn end stocks around 2.1 billion bushels. The lower yield estimate will keep balance sheets artificially low this summer.