The map above is the product of an experimental dry lightning forecast system developed by NOAA’s Storm Prediction Center, representing the Dry Thunderstom Potential Index for June 29. Here is the way it is explained at their site:
IT IS AN INDEX from 0 to 100 (Hatched areas above 50 show areas where the cloud bases will be the highest and/or the sub-cloud humidity the lowest-leading to more evaporation).
