HEAT & DROUGHT Heat Index Chart Keetch-Byram Drought Index Thunderstorms & Tornadoes Flooding Winter Weather Fire Weather General Radar Interpretation OK-FIRST Project, Oklahoma Climatological Survey, 100 East Boyd Street, Suite 1210, Norman, OK 73019. Copyright © 1996-2004 Oklahoma Climatological Survey. All Rights Reserved. Send comments or questions concerning OK-FIRST to okfirst@mesonet.org