1. School of Civil Engineering and Environmental Science, Univ. of Oklahoma, Norman, OK 73072.
2. School of Civil Engineering and Environmental Science, Univ. of Oklahoma, 120 David L. Boren Blvd., National Weather Center, Atmosphere Radar Research Center, Suite 4610, Norman, OK 73072 (corresponding author).
3. Southern Climate Impacts Planning Program, Oklahoma Climatological Survey, Univ. of Oklahoma, Norman, OK 73072.
4. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai Univ., Nanjing 210098, China.
5. College of Forest Resources and Environment, Nanjing Forestry Univ., Nanjing 210037, China.