This same group won part of their long battle in June when Governor Dolph Briscoe signed a law providing for elections before a weather modification permit can be issued in Texas. Since there are inadequate data to support claims of either side, it will be many years before the issue can be answered satisfactorily. Carr hopes that the TWDB can initiate a three-year study on the downwind effects of hail suppression this year. Results from hail suppression seeding projects vary more than those from precipitation experiments. The National Hail Research Experiment in northeastern Colorado has provided important physical descriptions of hailstorms there.
Results indicate that there are important differences in storms that produce hail.
The same method of seeding that suppresses one type of storm would not necessarily work on another type, and it is possible that current seeding methods and materials might even increase hail in some storms. Twenty to forty percent reductions in hail appear to be about the most that can be expected. Massive seeding well before the first hailstones are formed must be done to be successful.